Bio

Clinical Focus


  • Leukemia, Hairy Cell
  • Diffuse Large-Cell Lymphomas
  • Waldenstrom Macroglobulinemia
  • B-Cell Chronic Lymphocytic Leukemia
  • Burkitt Lymphoma
  • Medical Oncology
  • Lymphoma, B-Cell, Marginal Zone
  • Cancer > Lymphoma
  • Hodgkin Disease
  • Follicular Lymphoma
  • Lymphoma

Academic Appointments


Administrative Appointments


  • Steering Committee Member & Mentor, Stanford Computational & Systems Immunology (2012 - Present)
  • Admissions Panel, Stanford Medical School (2012 - Present)
  • Admissions Panel, Medical Scientist Training Program, Stanford University (2011 - Present)
  • Chair, Seminar Committee, Stanford Immunology Program (2011 - Present)

Honors & Awards


  • Doris Duke Clinical Scientist Development Award, Stanford University (2011)
  • Bent & Janet Cardan Oncology Research Fellow, Stanford University (2010)
  • Josephine Q. Berry Faculty Scholar in Cancer Research, Stanford University (2010)
  • Clinical Investigator Program: Fellow Award, Stanford University Medical Center (2004-2010)
  • Leukemia & Lymphoma Society Special Fellow in Clinical Research, Stanford University (2010)
  • Franklin G. Ebaugh, Jr. Award for Outstanding Research, Dept of Medicine, Stanford (2004-2005)
  • Sandler Fellow Award, UCSF (2003-2004)
  • Medical Scientist Training Program Award, NIH (1996-2003)
  • Research Scholar Award for Outstanding Research, HHMI (1998)
  • Intramural Research Award, NIH/NCI (1997 – 1998)
  • Research Scholar Award, HHMI-NIH (1996 – 1998)
  • NIH Research Fellow Award, NIH/NCI (6/1995)
  • Magna cum laude, College & Departmental Honors, UCLA (6/1993)

Professional Education


  • Board Certification: Medical Oncology, American Board of Internal Medicine (2009)
  • Fellowship:Stanford University School of Medicine (2009) CA
  • Residency:Stanford University School of Medicine - Stem Cell Institute Dr Weissman's Laboratory (2006) CA
  • Internship:Stanford University School of Medicine - Stem Cell Institute Dr Weissman's Laboratory (2005) CA
  • Medical Education:Stanford university School of Medicine (2003) CA
  • Board Certification: Hematology, American Board of Internal Medicine (2009)
  • Board Certification, American Board of Internal Medicine, Hematology (2009)
  • Board Certification, American Board of Internal Medicine, Medical Oncology (2009)
  • Board Certification: Internal Medicine, American Board of Internal Medicine (2008)
  • MD, Stanford university School of Medicine, Medicine (2003)
  • PhD, Stanford university School of Medicine, Biophysics/Dept of Biochemistry (2003)
  • B.S., UCLA, Biochemistry (1994)

Research & Scholarship

Current Research and Scholarly Interests


My group's research is focused on attaining a better understanding of the initiation, maintenance, and progression of tumors, and their response to current therapies toward improving future treatment strategies.

My group develops and applies genomic biomarkers of tumor cells, whether detected through biopsy of the primary neoplasm, or noninvasively through monitoring of the bodily fluids including blood. We apply such genomic biomarkers for the early detection, diagnosis, and monitoring of diverse tumors including lymphomas and solid tumors.

We are also interested in better molecular understanding of normal tissue stem cells and their malignant tumor-initiating counterparts (cancer stem cells), toward identification of the underlying mechanisms relevant to specific cancers of the hematopoietic system. These tumors include follicular lymphoma, diffuse large B-cell lymphoma, and mantle cell lymphoma.

We have also worked to build prognostic and predictive models for clinical and therapeutic outcomes of diverse human malignancies, through large-scale bioinformatic meta-analysis of human tumor transcriptomes, including deconvolution of complex tumor admixtures including infiltrating leukocytes.

In this effort, we help build and employ tools from functional genomics, computational biology, molecular genetics, and mouse models. We are applying this knowledge toward the design of clinical trials in the treatment of patients with various malignancies, whom I care for directly or indirectly, as a clinician specializing in Medical Oncology and Hematology.

Clinical Trials


  • A Study Of PF-05082566 As A Single Agent And In Combination With Rituximab Recruiting

    A study of PF-05082566, a 4-1BB agonist monoclonal antibody (mAb), in patients with solid tumors or b-cell lymphomas, and in combination with rituximab in patients with CD20 positive Non-Hodgkin's Lymphoma (NHL).

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  • Clinical and Pathologic Studies in Non-Hodgkin's Lymphoma and Hodgkin's Disease Recruiting

    The purpose of this study is to characterize the molecular and cell biology of the tumor cells in lymphoma.

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  • Phase I/II of a CpG-Activated Whole Cell Vaccine Followed by Autologous Immunotransplant for MCL Recruiting

    While autologous hematopoietic stem cell transplant (AHCT) has been shown to cure some subtypes of non-Hodgkin's lymphoma (NHL), mantle cell lymphoma (MCL) still has a prognosis marked by relapse. This study will evaluate the safety and efficacy of treating newly diagnosed MCL patients with an autologous, tumor-derived vaccine followed by re-infusion of vaccine-primed T cells combined with standard autologous hematopoietic stem cell transplant (AHCT). CpG-MCL vaccine is derived from each patient's own tumor, treated in vitro with the immunostimulatory CpG-enriched oligodeoxynucleotide - PF-3512676 - and irradiated. The overall treatment schema is that patients receive: induction chemotherapy, priming vaccinations, leukapheresis to harvest vaccine-primed T cells, preparative myeloablative chemotherapy followed by AHCT, re-infusion of vaccine-primed T-cells ('immunotransplant') and repeat vaccinations zero and three months post-AHCT.

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  • Oxaliplatin, Leucovorin, and Fluorouracil With or Without Bevacizumab in Treating Patients Who Have Undergone Surgery for Stage II Colon Cancer Not Recruiting

    This randomized phase III trial is studying oxaliplatin, leucovorin, fluorouracil, and bevacizumab to see how well they work compared to oxaliplatin, leucovorin, and fluorouracil or observation only in treating patients who have undergone surgery for stage II colon cancer. Drugs used in chemotherapy, such as oxaliplatin, leucovorin, and fluorouracil, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Monoclonal antibodies, such as bevacizumab, can block tumor growth in different ways. Some block the ability of tumor cells to grow and spread. Others find tumor cells and help kill them or carry tumor-killing substances to them. Bevacizumab may also stop the growth of tumor cells by blocking blood flow to the tumor. Giving combination chemotherapy together with bevacizumab after surgery may kill any remaining tumor cells or prevent the cancer from coming back. Sometimes, after surgery, the tumor may not need additional treatment until it progresses. In this case, observation may be sufficient. It is not yet known whether giving combination chemotherapy together with bevacizumab is more effective than combination chemotherapy alone or observation only in treating colon cancer.

    Stanford is currently not accepting patients for this trial. For more information, please contact Nancy Mori, (650) 724 - 0201.

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  • VTX-2337 in Combination With Radiotherapy in Patients Low-Grade B-cell Lymphomas Not Recruiting

    This study is to determine the safety and effectiveness of VTX-2337 (an investigational drug that stimulates the immune system) in combination with radiation therapy in treating patients with low-grade B-cell lymphoma. Patients will receive 2 low doses of radiotherapy, and 9 intratumoral injections of VTX-2337 over the course of 3 months.

    Stanford is currently not accepting patients for this trial. For more information, please contact Lori Richards, (650) 725 - 8589.

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  • A Study Evaluating the Efficacy and Safety of Idelalisib(GS-1101) in Combination With Bendamustine and Rituximab for Previously Treated Indolent Non-Hodgkin Lymphomas Not Recruiting

    The purpose of this study is to evaluate the effect of idelalisib (GS-1101) on the onset, magnitude, and duration of tumor control.

    Stanford is currently not accepting patients for this trial. For more information, please contact Lori Richards, 650-725-8589.

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  • A Phase 1 Study of MPDL3280A (an Engineered Anti-PDL1 Antibody) in Patients With Locally Advanced or Metastatic Solid Tumors Not Recruiting

    This Phase I, multicenter, first in human, open-label, dose escalation study will evaluate the safety, tolerability, and pharmacokinetics of MPDL3280A administered as single agent by intravenous (IV) infusion to patients with locally advanced or metastatic solid malignancies or hematologic malignancies.

    Stanford is currently not accepting patients for this trial. For more information, please contact Rajapaksa Amanda, 650-725-6301.

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  • A Study of PCI-32765 (Ibrutinib) in Patients With Refractory Follicular Lymphoma Not Recruiting

    The purpose of this study is to evaluate the efficacy and safety of PCI-32765 (ibrutinib) administered to patients with chemoimmunotherapy-resistant follicular lymphoma (FL).

    Stanford is currently not accepting patients for this trial. For more information, please contact Lori Richards, 650-725-8589.

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  • A Study Evaluating the Efficacy and Safety of Idelalisib (GS-1101) in Combination With Rituximab for Previously Treated Indolent Non-Hodgkin Lymphomas Not Recruiting

    The purpose of this study is to evaluate the effect of idelalisib (GS-1101) on the onset, magnitude, and duration of tumor control

    Stanford is currently not accepting patients for this trial. For more information, please contact Lori Richards, 650-725-8589.

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  • An Extension Study for Subjects Who Are Deriving Benefit With Idelalisib (GS-1101; CAL-101) Following Completion of a Prior Idelalisib Study Recruiting

    This is a long-term safety extension study of idelalisib (GS-1101; CAL-101) in patients with hematologic malignancies who complete other idelalisib studies. It provides the opportunity for patients to continue treatment as long as the patient is deriving clinical benefit. Patients will be followed according to the standard of care as appropriate for their type of cancer. The dose of idelalisib will generally be the same as the dose that was administered at the end of the prior study, but may be titrated up to improve clinical response or down for toxicity. Patients will be withdrawn from the study if they develop progressive disease, unacceptable toxicity related to idelalisib, or if they no longer derive clinical benefit in the opinion of the investigator.

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  • Genes in Predicting Outcome of Patients With Diffuse Large B-Cell Lymphoma Treated With Rituximab and Combination Chemotherapy Not Recruiting

    RATIONALE: Studying samples of tumor tissue from patients with cancer in the laboratory may help doctors learn more about changes that occur in DNA and identify biomarkers related to cancer. It may also help doctors predict how patients respond to treatment. PURPOSE: This phase II trial is studying how well genes and biomarkers predict outcome of patients with diffuse large B-cell lymphoma treated with rituximab and combination chemotherapy.

    Stanford is currently not accepting patients for this trial.

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Teaching

2013-14 Courses


Postdoctoral Advisees


Publications

Journal Articles


  • Association of a Leukemic Stem Cell Gene Expression Signature With Clinical Outcomes in Acute Myeloid Leukemia JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION Gentles, A. J., Plevritis, S. K., Majeti, R., Alizadeh, A. A. 2010; 304 (24): 2706-2715

    Abstract

    In many cancers, specific subpopulations of cells appear to be uniquely capable of initiating and maintaining tumors. The strongest support for this cancer stem cell model comes from transplantation assays in immunodeficient mice, which indicate that human acute myeloid leukemia (AML) is driven by self-renewing leukemic stem cells (LSCs). This model has significant implications for the development of novel therapies, but its clinical relevance has yet to be determined.To identify an LSC gene expression signature and test its association with clinical outcomes in AML.Retrospective study of global gene expression (microarray) profiles of LSC-enriched subpopulations from primary AML and normal patient samples, which were obtained at a US medical center between April 2005 and July 2007, and validation data sets of global transcriptional profiles of AML tumors from 4 independent cohorts (n = 1047).Identification of genes discriminating LSC-enriched populations from other subpopulations in AML tumors; and association of LSC-specific genes with overall, event-free, and relapse-free survival and with therapeutic response.Expression levels of 52 genes distinguished LSC-enriched populations from other subpopulations in cell-sorted AML samples. An LSC score summarizing expression of these genes in bulk primary AML tumor samples was associated with clinical outcomes in the 4 independent patient cohorts. High LSC scores were associated with worse overall, event-free, and relapse-free survival among patients with either normal karyotypes or chromosomal abnormalities. For the largest cohort of patients with normal karyotypes (n = 163), the LSC score was significantly associated with overall survival as a continuous variable (hazard ratio [HR], 1.15; 95% confidence interval [CI], 1.08-1.22; log-likelihood P <.001). The absolute risk of death by 3 years was 57% (95% CI, 43%-67%) for the low LSC score group compared with 78% (95% CI, 66%-86%) for the high LSC score group (HR, 1.9 [95% CI, 1.3-2.7]; log-rank P = .002). In another cohort with available data on event-free survival for 70 patients with normal karyotypes, the risk of an event by 3 years was 48% (95% CI, 27%-63%) in the low LSC score group vs 81% (95% CI, 60%-91%) in the high LSC score group (HR, 2.4 [95% CI, 1.3-4.5]; log-rank P = .006). In multivariate Cox regression including age, mutations in FLT3 and NPM1, and cytogenetic abnormalities, the HRs for LSC score in the 3 cohorts with data on all variables were 1.07 (95% CI, 1.01-1.13; P = .02), 1.10 (95% CI, 1.03-1.17; P = .005), and 1.17 (95% CI, 1.05-1.30; P = .005).High expression of an LSC gene signature is independently associated with adverse outcomes in patients with AML.

    View details for Web of Science ID 000285518000015

    View details for PubMedID 21177505

  • Therapeutic Antibody Targeting of CD47 Synergizes with Rituximab to Completely Eradicate Human B-Cell Lymphoma Cell Chao MP*, A., Tang CZ, Mykebust JH, Varghese B, Jan M, Levy R, Weissman IL, Majeti R. 2010; 142 (5): 699-713
  • CD47 Is an Adverse Prognostic Factor and Therapeutic Antibody Target on Human Acute Myeloid Leukemia Stem Cells CELL Majeti, R., Chao, M. P., Alizadeh, A. A., Pang, W. W., Jaiswal, S., Gibbs, K. D., van Rooijen, N., Weissman, I. L. 2009; 138 (2): 286-299

    Abstract

    Acute myeloid leukemia (AML) is organized as a cellular hierarchy initiated and maintained by a subset of self-renewing leukemia stem cells (LSC). We hypothesized that increased CD47 expression on human AML LSC contributes to pathogenesis by inhibiting their phagocytosis through the interaction of CD47 with an inhibitory receptor on phagocytes. We found that CD47 was more highly expressed on AML LSC than their normal counterparts, and that increased CD47 expression predicted worse overall survival in three independent cohorts of adult AML patients. Furthermore, blocking monoclonal antibodies directed against CD47 preferentially enabled phagocytosis of AML LSC and inhibited their engraftment in vivo. Finally, treatment of human AML LSC-engrafted mice with anti-CD47 antibody depleted AML and targeted AML LSC. In summary, increased CD47 expression is an independent, poor prognostic factor that can be targeted on human AML stem cells with blocking monoclonal antibodies capable of enabling phagocytosis of LSC.

    View details for DOI 10.1016/j.cell.2009.05.045

    View details for Web of Science ID 000268277000011

    View details for PubMedID 19632179

  • Molecular Outcome Prediction in Diffuse Large-B-Cell Lymphoma NEW ENGLAND JOURNAL OF MEDICINE Alizadeh, A. A., Gentles, A. J., Lossos, I. S., Levy, R. 2009; 360 (26): 2794-2795

    View details for Web of Science ID 000267286600032

    View details for PubMedID 19553658

  • SOURCE: a unified genomic resource of functional annotations, ontologies, and gene expression data NUCLEIC ACIDS RESEARCH Diehn, M., Sherlock, G., Binkley, G., Jin, H., Matese, J. C., Hernandez-Boussard, T., Rees, C. A., Cherry, J. M., Botstein, D., Brown, P. O., Alizadeh, A. A. 2003; 31 (1): 219-223

    Abstract

    The explosion in the number of functional genomic datasets generated with tools such as DNA microarrays has created a critical need for resources that facilitate the interpretation of large-scale biological data. SOURCE is a web-based database that brings together information from a broad range of resources, and provides it in manner particularly useful for genome-scale analyses. SOURCE's GeneReports include aliases, chromosomal location, functional descriptions, GeneOntology annotations, gene expression data, and links to external databases. We curate published microarray gene expression datasets and allow users to rapidly identify sets of co-regulated genes across a variety of tissues and a large number of conditions using a simple and intuitive interface. SOURCE provides content both in gene and cDNA clone-centric pages, and thus simplifies analysis of datasets generated using cDNA microarrays. SOURCE is continuously updated and contains the most recent and accurate information available for human, mouse, and rat genes. By allowing dynamic linking to individual gene or clone reports, SOURCE facilitates browsing of large genomic datasets. Finally, SOURCEs batch interface allows rapid extraction of data for thousands of genes or clones at once and thus facilitates statistical analyses such as assessing the enrichment of functional attributes within clusters of genes. SOURCE is available at http://source.stanford.edu.

    View details for DOI 10.1093/nar/gkg014

    View details for Web of Science ID 000181079700050

    View details for PubMedID 12519986

  • Distinct types of diffuse large B-cell lymphoma identified by gene expression profiling NATURE Alizadeh, A. A., Eisen, M. B., Davis, R. E., Ma, C., Lossos, I. S., Rosenwald, A., Boldrick, J. G., Sabet, H., Tran, T., Yu, X., Powell, J. I., Yang, L. M., Marti, G. E., Moore, T., Hudson, J., Lu, L. S., Lewis, D. B., Tibshirani, R., Sherlock, G., Chan, W. C., Greiner, T. C., Weisenburger, D. D., Armitage, J. O., Warnke, R., Levy, R., Wilson, W., Grever, M. R., Byrd, J. C., Botstein, D., Brown, P. O., Staudt, L. M. 2000; 403 (6769): 503-511

    Abstract

    Diffuse large B-cell lymphoma (DLBCL), the most common subtype of non-Hodgkin's lymphoma, is clinically heterogeneous: 40% of patients respond well to current therapy and have prolonged survival, whereas the remainder succumb to the disease. We proposed that this variability in natural history reflects unrecognized molecular heterogeneity in the tumours. Using DNA microarrays, we have conducted a systematic characterization of gene expression in B-cell malignancies. Here we show that there is diversity in gene expression among the tumours of DLBCL patients, apparently reflecting the variation in tumour proliferation rate, host response and differentiation state of the tumour. We identified two molecularly distinct forms of DLBCL which had gene expression patterns indicative of different stages of B-cell differentiation. One type expressed genes characteristic of germinal centre B cells ('germinal centre B-like DLBCL'); the second type expressed genes normally induced during in vitro activation of peripheral blood B cells ('activated B-like DLBCL'). Patients with germinal centre B-like DLBCL had a significantly better overall survival than those with activated B-like DLBCL. The molecular classification of tumours on the basis of gene expression can thus identify previously undetected and clinically significant subtypes of cancer.

    View details for Web of Science ID 000085227300039

    View details for PubMedID 10676951

  • Identification of gene microarray expression profiles in patients with chronic graft-versus-host disease following allogeneic hematopoietic cell transplantation. Clinical immunology Kohrt, H. E., Tian, L., Li, L., Alizadeh, A. A., Hsieh, S., Tibshirani, R. J., Strober, S., Sarwal, M., Lowsky, R. 2013; 148 (1): 124-135

    Abstract

    Chronic graft-versus-host disease (GVHD) results in significant morbidity and mortality, limiting the benefit of allogeneic hematopoietic cell transplantation (HCT). Peripheral blood gene expression profiling of the donor immune repertoire following HCT may provide associated genes and pathways thereby improving the pathophysiologic understanding of chronic GVHD. We profiled 70 patients and identified candidate genes that provided mechanistic insight in the biologic pathways that underlie chronic GVHD. Our data revealed that the dominant gene signature in patients with chronic GVHD represented compensatory responses that control inflammation and included the interleukin-1 decoy receptor, IL-1 receptor type II, and genes that were profibrotic and associated with the IL-4, IL-6 and IL-10 signaling pathways. In addition, we identified three genes that were important regulators of extracellular matrix. Validation of this discovery phase study will determine if the identified genes have diagnostic, prognostic or therapeutic implications.

    View details for DOI 10.1016/j.clim.2013.04.013

    View details for PubMedID 23685278

  • Utility in prognostic value added by molecular profiles for diffuse large B-cell lymphoma. Blood Gentles, A. J., Alizadeh, A. A. 2013; 121 (15): 3052-3054

    View details for DOI 10.1182/blood-2013-01-477521

    View details for PubMedID 23580636

  • Rituximab use and survival after diffuse large B-cell or follicular lymphoma: a population-based study LEUKEMIA & LYMPHOMA Keegan, T. H., Moy, L. M., Foran, J. M., Alizadeh, A. A., Chang, E. T., Shema, S. J., Schupp, C. W., Clarke, C. A., Glaser, S. L. 2013; 54 (4): 743-751

    Abstract

    To determine whether reported socioeconomic disparities in survival might be related to treatment, we examined patient and tumor characteristics associated with receipt of rituximab and survival in the National Cancer Institute's Patterns of Care Studies (2003 and 2008) for patients with diffuse large B-cell (DLBCL) and follicular (FL) lymphoma. Patients with DLBCL (n = 1192) were less likely to receive rituximab if they were older, black or Asian, lacked private medical insurance, had impaired performance status, had no lactate dehydrogenase measurements or were diagnosed with stage I disease. Patients with FL (n = 476) were less likely to receive rituximab if they were unmarried or non-Hispanic white. Receipt of rituximab did not differ by neighborhood median income. Treatment with rituximab was associated with better survival for patients with DLBCL, but not patients with FL. Lower rituximab use in patients with DLBCL without private insurance suggests that previously identified socioeconomic disparities in survival may, in part, be explained by receipt of rituximab.

    View details for DOI 10.3109/10428194.2012.727415

    View details for Web of Science ID 000315898100015

    View details for PubMedID 22957852

  • Hierarchy in somatic mutations arising during genomic evolution and progression of follicular lymphoma. Blood Green, M. R., Gentles, A. J., Nair, R. V., Irish, J. M., Kihira, S., Liu, C. L., Kela, I., Hopmans, E. S., Myklebust, J. H., Ji, H., Plevritis, S. K., Levy, R., Alizadeh, A. A. 2013; 121 (9): 1604-1611

    Abstract

    Follicular lymphoma (FL) is currently incurable using conventional chemotherapy or immunotherapy regimes, compelling new strategies. Advances in high-throughput sequencing technologies that can reveal oncogenic pathways have stimulated interest in tailoring therapies toward actionable somatic mutations. However, for mutation-directed therapies to be most effective, the mutations must be uniformly present in evolved tumor cells as well as in the self-renewing tumor-cell precursors. Here, we show striking intratumoral clonal diversity within FL tumors in the representation of mutations in the majority of genes as revealed by whole exome sequencing of subpopulations. This diversity captures a clonal hierarchy, resolved using immunoglobulin somatic mutations and IGH-BCL2 translocations as a frame of reference and by comparing diagnosis and relapse tumor pairs, allowing us to distinguish early versus late genetic eventsduring lymphomagenesis. We provide evidence that IGH-BCL2 translocations and CREBBP mutations are early events, whereas MLL2 and TNFRSF14 mutations probably represent late events during disease evolution. These observations provide insight into which of the genetic lesions represent suitable candidates for targeted therapies.

    View details for DOI 10.1182/blood-2012-09-457283

    View details for PubMedID 23297126

  • High PD-1 expression and suppressed cytokine signaling distinguish T cells infiltrating follicular lymphoma tumors from peripheral T cells. Blood Myklebust, J. H., Irish, J. M., Brody, J., Czerwinski, D. K., Houot, R., Kohrt, H. E., Timmerman, J., Said, J., Green, M. R., Delabie, J., Kolstad, A., Alizadeh, A. A., Levy, R. 2013; 121 (8): 1367-1376

    Abstract

    Defects in T-cell function in patients with cancer might influence their capacity to mount efficient antitumor immune responses. Here, we identified highly reduced IL-4-, IL-10-, and IL-21-induced phosphorylation of STAT6 and STAT3 in tumor-infiltrating T cells (TILs) in follicular lymphoma (FL) tumors, contrasting other non-Hodgkin lymphoma TILs. By combining phospho-protein-specific flow cytometry with several T-cell markers, we identified that CD4(+)CD45RO(+)CD62L(-) FL TILs were largely nonresponsive to cytokines, in contrast to the corresponding autologous peripheral blood subset. We observed differential expression of the inhibitory receptor PD-1 in FL TILs and peripheral blood T cells. Furthermore, CD4(+)PD-1(hi) FL TILs, containing T(FH) and non-T(FH) cells, had lost their cytokine responsiveness, whereas PD-1 TILs had normal cytokine signaling. However, this phenomenon was not tumor specific, because tonsil T cells were similar to FL TILs. FL tumor cells were negative for PD-1 ligands, but PD-L1(+) histiocytes were found within the T cell-rich zone of the neoplastic follicles. Disruption of the microenvironment and in vitro culture of FL TILs could restore cytokine signaling in the PD-1(hi) subset. Because FL TILs in vivo probably receive suppressive signals through PD-1, this provides a rationale for testing PD-1 Ab in combination with immunotherapy in patients with FL.

    View details for DOI 10.1182/blood-2012-04-421826

    View details for PubMedID 23297127

  • Germinal centre protein HGAL promotes lymphoid hyperplasia and amyloidosis via BCR-mediated Syk activation NATURE COMMUNICATIONS Romero-Camarero, I., Jiang, X., Natkunam, Y., Lu, X., Vicente-Duenas, C., Gonzalez-Herrero, I., Flores, T., Luis Garcia, J., McNamara, G., Kunder, C., Zhao, S., Segura, V., Fontan, L., Martinez-Climent, J. A., Javier Garcia-Criado, F., Theis, J. D., Dogan, A., Campos-Sanchez, E., Green, M. R., Alizadeh, A. A., Cobaleda, C., Sanchez-Garcia, I., Lossos, I. S. 2013; 4

    Abstract

    The human germinal centre-associated lymphoma gene is specifically expressed in germinal centre B-lymphocytes and germinal centre-derived B-cell lymphomas, but its function is largely unknown. Here we demonstrate that human germinal centre-associated lymphoma directly binds to Syk in B cells, increases its kinase activity on B-cell receptor stimulation and leads to enhanced activation of Syk downstream effectors. To further investigate these findings in vivo, human germinal centre-associated lymphoma transgenic mice were generated. Starting from 12 months of age these mice developed polyclonal B-cell lymphoid hyperplasia, hypergammaglobulinemia and systemic reactive amyloid A (AA) amyloidosis, leading to shortened survival. The lymphoid hyperplasia in the human germinal centre-associated lymphoma transgenic mice are likely attributable to enhanced B-cell receptor signalling as shown by increased Syk phosphorylation, ex vivo B-cell proliferation and increased RhoA activation. Overall, our study shows for the first time that the germinal centre protein human germinal centre-associated lymphoma regulates B-cell receptor signalling in B-lymphocytes which, without appropriate control, may lead to B-cell lymphoproliferation.

    View details for DOI 10.1038/ncomms2334

    View details for Web of Science ID 000316614600008

    View details for PubMedID 23299888

  • Self-antigen recognition by follicular lymphoma B-cell receptors BLOOD Sachen, K. L., Strohman, M. J., Singletary, J., Alizadeh, A. A., Kattah, N. H., Lossos, C., Mellins, E. D., Levy, S., Levy, R. 2012; 120 (20): 4182-4190

    Abstract

    Follicular lymphoma is a monoclonal B-cell malignancy with each patient's tumor expressing a unique cell surface immunoglobulin (Ig), or B-cell receptor (BCR), that can potentially recognize antigens and/or transduce signals into the tumor cell. Here we evaluated the reactivity of tumor derived Igs for human tissue antigens. Self-reactivity was observed in 26% of tumor Igs (25 of 98). For one follicular lymphoma patient, the recognized self-antigen was identified as myoferlin. This patient's tumor cells bound recombinant myoferlin in proportion to their level of BCR expression, and the binding to myoferlin was preserved despite ongoing somatic hypermutation of Ig variable regions. Furthermore, BCR-mediated signaling was induced after culture of tumor cells with myoferlin. These results suggest that antigen stimulation may provide survival signals to tumor cells and that there is a selective pressure to preserve antigen recognition as the tumor evolves.

    View details for DOI 10.1182/blood-2012-05-427534

    View details for Web of Science ID 000311637400013

    View details for PubMedID 23024238

  • Role of Smad Proteins in Resistance to BMP-Induced Growth Inhibition in B-Cell Lymphoma PLOS ONE Huse, K., Bakkebo, M., Walchli, S., Oksvold, M. P., Hilden, V. I., Forfang, L., Bredahl, M. L., Liestol, K., Alizadeh, A. A., Smeland, E. B., Myklebust, J. H. 2012; 7 (10)

    Abstract

    Bone morphogenetic protein (BMP) expression and signaling are altered in a variety of cancers, but the functional impact of these alterations is uncertain. In this study we investigated the impact of expression of multiple BMPs and their signaling pathway components in human B-cell lymphoma. BMP messages, in particular BMP7, were detected in normal and malignant B cells. Addition of exogenous BMPs inhibited DNA synthesis in most lymphoma cell lines examined, but some cell lines were resistant. Tumor specimens from three out of five lymphoma patients were also resistant to BMPs, as determined by no activation of the BMP effectors Smad1/5/8. We have previously shown that BMP-7 potently induced apoptosis in normal B cells, which was in contrast to no or little inhibitory effect of this BMP in the lymphoma cells tested. BMP-resistance mechanisms were investigated by comparing sensitive and resistant cell lines. While BMP receptors are downregulated in many cancers, we documented similar receptor levels in resistant and sensitive lymphoma cells. We found a positive correlation between activation of Smad1/5/8 and inhibition of DNA synthesis. Gene expression analysis of two independent data sets showed that the levels of inhibitory Smads varied across different B-cell lymphoma. Furthermore, stable overexpression of Smad7 in two different BMP-sensitive cell lines with low endogenous levels of SMAD7, rendered them completely resistant to BMPs. This work highlights the role of Smads in determining the sensitivity to BMPs and shows that upregulation of Smad7 in cancer cells is sufficient to escape the negative effects of BMPs.

    View details for DOI 10.1371/journal.pone.0046117

    View details for Web of Science ID 000309388500019

    View details for PubMedID 23049692

  • CD137 Is Expressed in Follicular Dendritic Cell Tumors and in Classical Hodgkin and T-Cell Lymphomas Diagnostic and Therapeutic Implications AMERICAN JOURNAL OF PATHOLOGY Anderson, M. W., Zhao, S., Freud, A. G., Czerwinski, D. K., Kohrt, H., Alizadeh, A. A., Houot, R., Azambuja, D., Biasoli, I., Morais, J. C., Spector, N., Molina-Kirsch, H. F., Warnke, R. A., Levy, R., Natkunam, Y. 2012; 181 (3): 795-803

    Abstract

    CD137 (also known as 4-1BB and TNFRSF9) is a member of the tumor necrosis factor receptor superfamily. Originally identified as a costimulatory molecule expressed by activated T cells and NK cells, CD137 is also expressed by follicular dendritic cells, monocytes, mast cells, granulocytes, and endothelial cells. Anti-CD137 immunotherapy has recently shown promise as a treatment for solid tumors and lymphoid malignancies in preclinical models. We defined the expression of CD137 protein in both normal and neoplastic hematolymphoid tissue. CD137 protein is expressed by follicular dendritic cells in the germinal center and scattered paracortical T cells, but not by normal germinal-center B cells, bone marrow progenitor cells, or maturing thymocytes. CD137 protein is expressed by a select group of hematolymphoid tumors, including classical Hodgkin lymphoma, T-cell and NK/T-cell lymphomas, and follicular dendritic cells neoplasms. CD137 is a novel diagnostic marker of these tumors and suggests a possible target for tumor-directed antibody therapy.

    View details for DOI 10.1016/j.ajpath.2012.05.015

    View details for Web of Science ID 000309251100009

    View details for PubMedID 22901750

  • The chemoattractant chemerin suppresses melanoma by recruiting natural killer cell antitumor defenses JOURNAL OF EXPERIMENTAL MEDICINE Pachynski, R. K., Zabel, B. A., Kohrt, H. E., Tejeda, N. M., Monnier, J., Swanson, C. D., Holzer, A. K., Gentles, A. J., Sperinde, G. V., Edalati, A., Hadeiba, H. A., Alizadeh, A. A., Butcher, E. C. 2012; 209 (8): 1427-1435

    Abstract

    Infiltration of specialized immune cells regulates the growth and survival of neoplasia. Here, in a survey of public whole genome expression datasets we found that the gene for chemerin, a widely expressed endogenous chemoattractant protein, is down-regulated in melanoma as well as other human tumors. Moreover, high chemerin messenger RNA expression in tumors correlated with improved outcome in human melanoma. In experiments using the B16 transplantable mouse melanoma, tumor-expressed chemerin inhibited in vivo tumor growth without altering in vitro proliferation. Growth inhibition was associated with an altered profile of tumor-infiltrating cells with an increase in natural killer (NK) cells and a relative reduction in myeloid-derived suppressor cells and putative immune inhibitory plasmacytoid dendritic cells. Tumor inhibition required host expression of CMKLR1 (chemokine-like receptor 1), the chemoattractant receptor for chemerin, and was abrogated by NK cell depletion. Intratumoral injection of chemerin also inhibited tumor growth, suggesting the potential for therapeutic application. These results show that chemerin, whether expressed by tumor cells or within the tumor environment, can recruit host immune defenses that inhibit tumorigenesis and suggest that down-regulation of chemerin may be an important mechanism of tumor immune evasion.

    View details for DOI 10.1084/jem.20112124

    View details for Web of Science ID 000307016500006

    View details for PubMedID 22753924

  • A retrospective study evaluating the efficacy and safety of bendamustine in the treatment of mantle cell lymphoma LEUKEMIA & LYMPHOMA Warsch, S., Hosein, P. J., Maeda, L. S., Alizadeh, A. A., Lossos, I. S. 2012; 53 (7): 1299-1305

    Abstract

    Bendamustine is approved in the United States for relapsed indolent lymphoma. However, it has not been widely studied in mantle cell lymphoma (MCL). We retrospectively reviewed the records of all patients with MCL who were treated with bendamustine at three centers. The primary endpoint was overall response rate (ORR). Thirty patients with MCL received bendamustine, 25 for relapsed disease. After a median follow-up of 12 months, there were 15 complete responses (CRs) with an ORR of 83% (95% confidence interval [CI] 70-97%). Factors significantly associated with longer survival were achieving a CR and classical (versus blastic) variant of MCL. Grade 3 or 4 neutropenia, anemia and thrombocytopenia occurred in 23%, 3% and 20%, respectively. There was one case of progressive multifocal leukoencephalopathy 10 months after therapy completion. Bendamustine in combination with rituximab demonstrated a high response rate in this study of patients with predominantly relapsed MCL.

    View details for DOI 10.3109/10428194.2011.649476

    View details for Web of Science ID 000305480100011

    View details for PubMedID 22185662

  • The CD47-signal regulatory protein alpha (SIRPa) interaction is a therapeutic target for human solid tumors PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Willingham, S. B., Volkmer, J., Gentles, A. J., Sahoo, D., Dalerba, P., Mitra, S. S., Wang, J., Contreras-Trujillo, H., Martin, R., Cohen, J. D., Lovelace, P., Scheeren, F. A., Chao, M. P., Weiskopf, K., Tang, C., Volkmer, A. K., Naik, T. J., Storm, T. A., Mosley, A. R., Edris, B., Schmid, S. M., Sun, C. K., Chua, M., Murillo, O., Rajendran, P., Cha, A. C., Chin, R. K., Kim, D., Adorno, M., Raveh, T., Tseng, D., Jaiswal, S., Enger, P. O., Steinberg, G. K., Li, G., So, S. K., Majeti, R., Harsh, G. R., van de Rijn, M., Teng, N. N., Sunwoo, J. B., Alizadeh, A. A., Clarke, M. F., Weissman, I. L. 2012; 109 (17): 6662-6667

    Abstract

    CD47, a "don't eat me" signal for phagocytic cells, is expressed on the surface of all human solid tumor cells. Analysis of patient tumor and matched adjacent normal (nontumor) tissue revealed that CD47 is overexpressed on cancer cells. CD47 mRNA expression levels correlated with a decreased probability of survival for multiple types of cancer. CD47 is a ligand for SIRP?, a protein expressed on macrophages and dendritic cells. In vitro, blockade of CD47 signaling using targeted monoclonal antibodies enabled macrophage phagocytosis of tumor cells that were otherwise protected. Administration of anti-CD47 antibodies inhibited tumor growth in orthotopic immunodeficient mouse xenotransplantation models established with patient tumor cells and increased the survival of the mice over time. Anti-CD47 antibody therapy initiated on larger tumors inhibited tumor growth and prevented or treated metastasis, but initiation of the therapy on smaller tumors was potentially curative. The safety and efficacy of targeting CD47 was further tested and validated in immune competent hosts using an orthotopic mouse breast cancer model. These results suggest all human solid tumor cells require CD47 expression to suppress phagocytic innate immune surveillance and elimination. These data, taken together with similar findings with other human neoplasms, show that CD47 is a commonly expressed molecule on all cancers, its function to block phagocytosis is known, and blockade of its function leads to tumor cell phagocytosis and elimination. CD47 is therefore a validated target for cancer therapies.

    View details for DOI 10.1073/pnas.1121623109

    View details for Web of Science ID 000303249100065

    View details for PubMedID 22451913

  • First Isolation of Cryptococcus uzbekistanensis from an Immunocompromised Patient with Lymphoma JOURNAL OF CLINICAL MICROBIOLOGY Powel, M. S., Alizadeh, A. A., Budvytiene, I., Schaenman, J. M., Banaei, N. 2012; 50 (3): 1125-1127

    Abstract

    Cryptococcus species are known agents of opportunistic infections in healthy and immunocompromised hosts. Here we describe the first case of Cryptococcus uzbekistanensis causing bone marrow infection in an elderly Asian man with undiagnosed T cell lymphoma presenting with fever of unknown origin, pancytopenia, and exposure to chicken manure.

    View details for DOI 10.1128/JCM.05678-11

    View details for Web of Science ID 000300997800099

    View details for PubMedID 22189126

  • Three differentiation states risk-stratify bladder cancer into distinct subtypes PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Volkmer, J., Sahoo, D., Chin, R. K., Ho, P. L., Tang, C., Kurtova, A. V., Willingham, S. B., Pazhanisamy, S. K., Contreras-Trujillo, H., Storm, T. A., Lotan, Y., Beck, A. H., Chung, B. I., Alizadeh, A. A., Godoy, G., Lerner, S. P., van de Rijng, M., Shortliffe, L. D., Weissman, I. L., Chan, K. S. 2012; 109 (6): 2078-2083

    Abstract

    Current clinical judgment in bladder cancer (BC) relies primarily on pathological stage and grade. We investigated whether a molecular classification of tumor cell differentiation, based on a developmental biology approach, can provide additional prognostic information. Exploiting large preexisting gene-expression databases, we developed a biologically supervised computational model to predict markers that correspond with BC differentiation. To provide mechanistic insight, we assessed relative tumorigenicity and differentiation potential via xenotransplantation. We then correlated the prognostic utility of the identified markers to outcomes within gene expression and formalin-fixed paraffin-embedded (FFPE) tissue datasets. Our data indicate that BC can be subclassified into three subtypes, on the basis of their differentiation states: basal, intermediate, and differentiated, where only the most primitive tumor cell subpopulation within each subtype is capable of generating xenograft tumors and recapitulating downstream populations. We found that keratin 14 (KRT14) marks the most primitive differentiation state that precedes KRT5 and KRT20 expression. Furthermore, KRT14 expression is consistently associated with worse prognosis in both univariate and multivariate analyses. We identify here three distinct BC subtypes on the basis of their differentiation states, each harboring a unique tumor-initiating population.

    View details for DOI 10.1073/pnas.1120605109

    View details for Web of Science ID 000299925000058

    View details for PubMedID 22308455

  • Treatment advances have not improved the early death rate in acute promyelocytic leukemia HAEMATOLOGICA-THE HEMATOLOGY JOURNAL McClellan, J. S., Kohrt, H. E., Coutre, S., Gotlib, J. R., Majeti, R., Alizadeh, A. A., Medeiros, B. C. 2012; 97 (1): 133-136

    Abstract

    Early mortality in acute promyelocytic leukemia has been reported to occur in less than 10% of patients treated in clinical trials. This study reports the incidence and clinical features of acute promyelocytic leukemia patients treated at Stanford Hospital, CA, USA since March 1997, focusing on early mortality. We show that the risk of early death in acute promyelocytic leukemia patients is higher than previously reported. In a cohort of 70 patients who received induction therapy at Stanford Hospital, 19% and 26% died within seven and 30 days of admission, respectively. High early mortality was not limited to our institution as evaluation of the Surveillance, Epidemiology and End Results Database demonstrated that 30-day mortality for acute promyelocytic leukemia averaged 20% from 1977-2007 and did not improve significantly over this interval. Our findings show that early death is now the greatest contributor to treatment failure in this otherwise highly curable form of leukemia.

    View details for DOI 10.3324/haematol.2011.046490

    View details for Web of Science ID 000299870500022

    View details for PubMedID 21993679

  • Correction: Specific post-translational histone modifications of neutrophil extracellular traps as immunogens and potential targets of lupus autoantibodies. Arthritis research & therapy Liu, C. L., Tangsombatvisit, S., Rosenberg, J. M., Mandelbaum, G., Gillespie, E. C., Gozani, O. P., Alizadeh, A. A., Utz, P. J. 2012; 14 (4): 403

    View details for PubMedID 22894771

  • Specific post-translational histone modifications of neutrophil extracellular traps as immunogens and potential targets of lupus autoantibodies ARTHRITIS RESEARCH & THERAPY Liu, C. L., Tangsombatvisit, S., Rosenberg, J. M., Mandelbaum, G., Gillespie, E. C., Gozani, O. P., Alizadeh, A. A., Utz, P. J. 2012; 14 (1)

    Abstract

    Autoreactivity to histones is a pervasive feature of several human autoimmune disorders, including systemic lupus erythematosus (SLE). Specific post-translational modifications (PTMs) of histones within neutrophil extracellular traps (NETs) may potentially drive the process by which tolerance to these chromatin-associated proteins is broken. We hypothesized that NETs and their unique histone PTMs might be capable of inducing autoantibodies that target histones.We developed a novel and efficient method for the in vitro production, visualization, and broad profiling of histone-PTMs of human and murine NETs. We also immunized Balb/c mice with murine NETs and profiled their sera on autoantigen and histone peptide microarrays for evidence of autoantibody production to their immunogen.We confirmed specificity toward acetyl-modified histone H2B as well as to other histone PTMs in sera from patients with SLE known to have autoreactivity against histones. We observed enrichment for distinctive histone marks of transcriptionally silent DNA during NETosis triggered by diverse stimuli. However, NETs derived from human and murine sources did not harbor many of the PTMs toward which autoreactivity was observed in patients with SLE or in MRL/lpr mice. Further, while murine NETs were weak autoantigens in vivo, there was only partial overlap in the immunoglobulin G (IgG) and IgM autoantibody profiles induced by vaccination of mice with NETs and those seen in patients with SLE.Isolated in vivo exposure to NETs is insufficient to break tolerance and may involve additional factors that have yet to be identified.

    View details for DOI 10.1186/ar3707

    View details for Web of Science ID 000304698800039

    View details for PubMedID 22300536

  • A few good genes Simple, biologically motivated signatures for cancer prognosis CELL CYCLE Gentles, A. J., Alizadeh, A. A. 2011; 10 (21): 3615-3616

    View details for DOI 10.4161/cc.10.21.17835

    View details for Web of Science ID 000296572100003

    View details for PubMedID 22037208

  • A proteomic approach for the identification of novel lysine methyltransferase substrates EPIGENETICS & CHROMATIN Levy, D., Liu, C. L., Yang, Z., Newman, A. M., Alizadeh, A. A., Utz, P. J., Gozani, O. 2011; 4

    Abstract

    Signaling via protein lysine methylation has been proposed to play a central role in the regulation of many physiologic and pathologic programs. In contrast to other post-translational modifications such as phosphorylation, proteome-wide approaches to investigate lysine methylation networks do not exist.In the current study, we used the ProtoArray® platform, containing over 9,500 human proteins, and developed and optimized a system for proteome-wide identification of novel methylation events catalyzed by the protein lysine methyltransferase (PKMT) SETD6. This enzyme had previously been shown to methylate the transcription factor RelA, but it was not known whether SETD6 had other substrates. By using two independent detection approaches, we identified novel candidate substrates for SETD6, and verified that all targets tested in vitro and in cells were genuine substrates.We describe a novel proteome-wide methodology for the identification of new PKMT substrates. This technological advance may lead to a better understanding of the enzymatic activity and substrate specificity of the large number (more than 50) PKMTs present in the human proteome, most of which are uncharacterized.

    View details for DOI 10.1186/1756-8935-4-19

    View details for Web of Science ID 000296832600001

    View details for PubMedID 22024134

  • Utility of positron emission tomography scans in mantle cell lymphoma AMERICAN JOURNAL OF HEMATOLOGY Hosein, P. J., Pastorini, V. H., Paes, F. M., Eber, D., Chapman, J. R., Serafini, A. N., Alizadeh, A. A., Lossos, I. S. 2011; 86 (10): 841-845

    Abstract

    Positron emission tomography (PET) scans are widely used in patients with lymphoma but little is known about their utility in mantle cell lymphoma (MCL). MCL patients were included from two prospective trials and one observational study at our institution. A total of 276 PET scans were performed among 52 patients. After a median follow-up of 37.5 months, the 3-year event-free survival (EFS) and overall survival (OS) were 73% (95% confidence interval [CI]: 61-85%) and 92% (95% CI 85-100%), respectively. There were 34 pretreatment PET scans, 26 interim, 28 end-of-treatment, 162 surveillance, and 26 scans at relapse or beyond. Pretreatment PETs were positive in 94%. A negative interim or end-of-therapy PET scan was not significantly associated with better EFS or OS, but no deaths were observed in patients who had a negative interim or end-of-therapy PET. Surveillance PET scans had a high false positive rate (35%) and low positive predictive value (8%). PET scans contributed to an earlier diagnosis of relapse in only two out of the 18 patients (11%) who relapsed. PET scans did not meaningfully contribute to staging or surveillance of MCL patients in this study. There was a trend toward improved survival in patients who had a negative end-of-therapy PET scan.

    View details for DOI 10.1002/ajh.22126

    View details for Web of Science ID 000295231800004

    View details for PubMedID 21922524

  • Impact of TET2 mutations on mRNA expression and clinical outcomes in MDS patients treated with DNA methyltransferase inhibitors HEMATOLOGICAL ONCOLOGY Pollyea, D. A., Raval, A., Kusler, B., Gotlib, J. R., Alizadeh, A. A., Mitchell, B. S. 2011; 29 (3): 157-160

    View details for DOI 10.1002/hon.976

    View details for Web of Science ID 000300148700010

    View details for PubMedID 21922510

  • Surprise! HSC Are Aberrant in Chronic Lymphocytic Leukemia CANCER CELL Alizadeh, A. A., Majeti, R. 2011; 20 (2): 135-136

    Abstract

    In this issue of Cancer Cell, Kikushige et al. report the surprising finding that, in human chronic lymphocytic leukemia (CLL), hematopoietic stem cells (HSC) aberrantly generate clonal B cells with CLL-like phenotypes, which implicate HSC in the pathogenesis of this mature lymphoid malignancy and has major implications for CLL therapies.

    View details for DOI 10.1016/j.ccr.2011.08.001

    View details for Web of Science ID 000294099700002

    View details for PubMedID 21840478

  • Prediction of survival in diffuse large B-cell lymphoma based on the expression of 2 genes reflecting tumor and microenvironment BLOOD Alizadeh, A. A., Gentles, A. J., Alencar, A. J., Liu, C. L., Kohrt, H. E., Houot, R., Goldstein, M. J., Zhao, S., Natkunam, Y., Advani, R. H., Gascoyne, R. D., Briones, J., Tibshirani, R. J., Myklebust, J. H., Plevritis, S. K., Lossos, I. S., Levy, R. 2011; 118 (5): 1350-1358

    Abstract

    Several gene-expression signatures predict survival in diffuse large B-cell lymphoma (DLBCL), but the lack of practical methods for genome-scale analysis has limited translation to clinical practice. We built and validated a simple model using one gene expressed by tumor cells and another expressed by host immune cells, assessing added prognostic value to the clinical International Prognostic Index (IPI). LIM domain only 2 (LMO2) was validated as an independent predictor of survival and the "germinal center B cell-like" subtype. Expression of tumor necrosis factor receptor superfamily member 9 (TNFRSF9) from the DLBCL microenvironment was the best gene in bivariate combination with LMO2. Study of TNFRSF9 tissue expression in 95 patients with DLBCL showed expression limited to infiltrating T cells. A model integrating these 2 genes was independent of "cell-of-origin" classification, "stromal signatures," IPI, and added to the predictive power of the IPI. A composite score integrating these genes with IPI performed well in 3 independent cohorts of 545 DLBCL patients, as well as in a simple assay of routine formalin-fixed specimens from a new validation cohort of 147 patients with DLBCL. We conclude that the measurement of a single gene expressed by tumor cells (LMO2) and a single gene expressed by the immune microenvironment (TNFRSF9) powerfully predicts overall survival in patients with DLBCL.

    View details for DOI 10.1182/blood-2011-03-345272

    View details for Web of Science ID 000293510000028

    View details for PubMedID 21670469

  • Prospective separation of normal and leukemic stem cells based on differential expression of TIM3, a human acute myeloid leukemia stem cell marker PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Jan, M., Chao, M. P., Cha, A. C., Alizadeh, A. A., Gentles, A. J., Weissman, I. L., Majeti, R. 2011; 108 (12): 5009-5014

    Abstract

    Hematopoietic tissues in acute myeloid leukemia (AML) patients contain both leukemia stem cells (LSC) and residual normal hematopoietic stem cells (HSC). The ability to prospectively separate residual HSC from LSC would enable important scientific and clinical investigation including the possibility of purged autologous hematopoietic cell transplants. We report here the identification of TIM3 as an AML stem cell surface marker more highly expressed on multiple specimens of AML LSC than on normal bone marrow HSC. TIM3 expression was detected in all cytogenetic subgroups of AML, but was significantly higher in AML-associated with core binding factor translocations or mutations in CEBPA. By assessing engraftment in NOD/SCID/IL2R?-null mice, we determined that HSC function resides predominantly in the TIM3-negative fraction of normal bone marrow, whereas LSC function from multiple AML specimens resides predominantly in the TIM3-positive compartment. Significantly, differential TIM3 expression enabled the prospective separation of HSC from LSC in the majority of AML specimens with detectable residual HSC function.

    View details for DOI 10.1073/pnas.1100551108

    View details for Web of Science ID 000288712200061

    View details for PubMedID 21383193

  • CD137 stimulation enhances the antilymphoma activity of anti-CD20 antibodies BLOOD Kohrt, H. E., Houot, R., Goldstein, M. J., Weiskopf, K., Alizadeh, A. A., Brody, J., Mueller, A., Pachynski, R., Czerwinski, D., Coutre, S., Chao, M. P., Chen, L., Tedder, T. F., Levy, R. 2011; 117 (8): 2423-2432

    Abstract

    Antibody-dependent cell-mediated cytotoxicity (ADCC), which is largely mediated by natural killer (NK) cells, is thought to play an important role in the efficacy of rituximab, an anti-CD20 monoclonal antibody (mAb) used to treat patients with B-cell lymphomas. CD137 is a costimulatory molecule expressed on a variety of immune cells after activation, including NK cells. In the present study, we show that an anti-CD137 agonistic mAb enhances the antilymphoma activity of rituximab by enhancing ADCC. Human NK cells up-regulate CD137 after encountering rituximab-coated tumor B cells, and subsequent stimulation of these NK cells with anti-CD137 mAb enhances rituximab-dependent cytotoxicity against the lymphoma cells. In a syngeneic murine lymphoma model and in a xenotransplanted human lymphoma model, sequential administration of anti-CD20 mAb followed by anti-CD137 mAb had potent antilymphoma activity in vivo. These results support a novel, sequential antibody approach against B-cell malignancies by targeting first the tumor and then the host immune system.

    View details for DOI 10.1182/blood-2010-08-301945

    View details for Web of Science ID 000287698800023

    View details for PubMedID 21193697

  • Therapeutic Antibody Targeting of CD47 Eliminates Human Acute Lymphoblastic Leukemia CANCER RESEARCH Chao, M. P., Alizadeh, A. A., Tang, C., Jan, M., Weissman-Tsukamoto, R., Zhao, F., Park, C. Y., Weissman, I. L., Majeti, R. 2011; 71 (4): 1374-1384

    Abstract

    Acute lymphoblastic leukemia (ALL) is the most common pediatric malignancy and constitutes 15% of adult leukemias. Although overall prognosis for pediatric ALL is favorable, high-risk pediatric patients and most adult patients have significantly worse outcomes. Multiagent chemotherapy is standard of care for both pediatric and adult ALL, but is associated with systemic toxicity and long-term side effects and is relatively ineffective against certain ALL subtypes. Recent efforts have focused on the development of targeted therapies for ALL including monoclonal antibodies. Here, we report the identification of CD47, a protein that inhibits phagocytosis, as an antibody target in standard and high-risk ALL. CD47 was found to be more highly expressed on a subset of human ALL patient samples compared with normal cell counterparts and to be an independent predictor of survival and disease refractoriness in several ALL patient cohorts. In addition, a blocking monoclonal antibody against CD47 enabled phagocytosis of ALL cells by macrophages in vitro and inhibited tumor engraftment in vivo. Significantly, anti-CD47 antibody eliminated ALL in the peripheral blood, bone marrow, spleen, and liver of mice engrafted with primary human ALL. These data provide preclinical support for the development of an anti-CD47 antibody therapy for treatment of human ALL.

    View details for DOI 10.1158/0008-5472.CAN-10-2238

    View details for Web of Science ID 000287352600020

    View details for PubMedID 21177380

  • Calreticulin Is the Dominant Pro-Phagocytic Signal on Multiple Human Cancers and Is Counterbalanced by CD47 SCIENCE TRANSLATIONAL MEDICINE Chao, M. P., Jaiswal, S., Weissman-Tsukamoto, R., Alizadeh, A. A., Gentles, A. J., Volkmer, J., Weiskopf, K., Willingham, S. B., Raveh, T., Park, C. Y., Majeti, R., Weissman, I. L. 2010; 2 (63)

    Abstract

    Under normal physiological conditions, cellular homeostasis is partly regulated by a balance of pro- and anti-phagocytic signals. CD47, which prevents cancer cell phagocytosis by the innate immune system, is highly expressed on several human cancers including acute myeloid leukemia, non-Hodgkin's lymphoma, and bladder cancer. Blocking CD47 with a monoclonal antibody results in phagocytosis of cancer cells and leads to in vivo tumor elimination, yet normal cells remain mostly unaffected. Thus, we postulated that cancer cells must also display a potent pro-phagocytic signal. Here, we identified calreticulin as a pro-phagocytic signal that was highly expressed on the surface of several human cancers, but was minimally expressed on most normal cells. Increased CD47 expression correlated with high amounts of calreticulin on cancer cells and was necessary for protection from calreticulin-mediated phagocytosis. Blocking the interaction of target cell calreticulin with its receptor, low-density lipoprotein receptor-related protein, on phagocytic cells prevented anti-CD47 antibody-mediated phagocytosis. Furthermore, increased calreticulin expression was an adverse prognostic factor in diverse tumors including neuroblastoma, bladder cancer, and non-Hodgkin's lymphoma. These findings identify calreticulin as the dominant pro-phagocytic signal on several human cancers, provide an explanation for the selective targeting of tumor cells by anti-CD47 antibody, and highlight the balance between pro- and anti-phagocytic signals in the immune evasion of cancer.

    View details for DOI 10.1126/scitranslmed.3001375

    View details for Web of Science ID 000288444900003

    View details for PubMedID 21178137

  • Second-line mitoxantrone, etoposide, and cytarabine for acute myeloid leukemia: A single-center experience AMERICAN JOURNAL OF HEMATOLOGY Kohrt, H. E., Patel, S., Ho, M., Owen, T., Pollyea, D. A., Majeti, R., Gotlib, J., Coutre, S., Liedtke, M., Berube, C., Alizadeh, A. A., Medeiros, B. C. 2010; 85 (11): 877-881

    Abstract

    The majority of patients with acute myeloid leukemia (AML) will require second-line chemotherapy for either relapsed or refractory disease. Currently, only allogeneic hematopoietic cell transplantation (HCT) offers a curative option in this setting and no preferred regimen has been established. The reported efficacy of second-line regimens is widely disparate, thus limiting informed clinical decision making. A retrospective review of 77 patients receiving therapy between 2001 and 2008 with relapsed, 42, and refractory, 35, AML was performed to determine overall response rate and survival following mitoxantrone (8 mg/m(2)/day), etoposide (100 mg/m(2)/day), and cytarabine (1,000 mg/m(2)/day) chemotherapy administered over 5 days. Among 77 patients (median age of 54 years and 64% intermediate risk karyotype) with median follow-up of 153 days, 18% achieved a complete response and 8% a morphologic leukemia-free state. Fifty-seven (74%) experienced treatment failure, 10 of whom achieved a remission after additional therapy. Median overall survival (OS) was 6.8 months. Among patients achieving a response, 50% received consolidation with allogeneic HCT, autologous HCT (5%), or consolidation chemotherapy alone (45%). A nonsignificant trend in overall response (50%, 27%, and 23.8%) and median OS (8.3, 6.8, and 4.7 months) was observed by cytogenetic stratification into favorable, intermediate, and unfavorable risk. Patients with refractory versus relapsed disease had similar overall responses (20% and 31%, P = 0.41) and median OS (5.3 and 7.6 months, P = 0.36). Despite risk stratification by the European Prognostic Index, our series demonstrates inferior rates of response and survival, illustrating the limited activity of this regimen in our cohort.

    View details for DOI 10.1002/ajh.21857

    View details for Web of Science ID 000283568200010

    View details for PubMedID 20872554

  • B-cell signaling networks reveal a negative prognostic human lymphoma cell subset that emerges during tumor progression PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Irish, J. M., Myklebust, J. H., Alizadeh, A. A., Houot, R., Sharman, J. P., Czerwinski, D. K., Nolan, G. P., Levy, R. 2010; 107 (29): 12747-12754

    Abstract

    Human tumors contain populations of both cancerous and host immune cells whose malignant signaling interactions may define each patient's disease trajectory. We used multiplexed phospho-flow cytometry to profile single cells within human follicular lymphoma tumors and discovered a subpopulation of lymphoma cells with impaired B cell antigen receptor (BCR) signaling. The abundance of BCR-insensitive cells in each tumor negatively correlated with overall patient survival. These lymphoma negative prognostic (LNP) cells increased as tumors relapsed following chemotherapy. Loss of antigen receptor expression did not explain the absence of BCR signaling in LNP tumor cells, and other signaling responses were intact in these cells. Furthermore, BCR signaling responses could be reactivated in LNP cells, indicating that BCR signaling is not missing but rather specifically suppressed. LNP cells were also associated with changes to signaling interactions in the tumor microenvironment. Lower IL-7 signaling in tumor infiltrating T cells was observed in tumors with high LNP cell counts. The strength of signaling through T cell mediator of B cell function CD40 also stratified patient survival, particularly for those whose tumors contained few LNP cells. Thus, analysis of cell-cell interactions in heterogeneous primary tumors using signaling network profiles can identify and mechanistically define new populations of rare and clinically significant cells. Both the existence of these LNP cells and their aberrant signaling profiles provide targets for new therapies for follicular lymphoma.

    View details for DOI 10.1073/pnas.1002057107

    View details for Web of Science ID 000280144500010

    View details for PubMedID 20543139

  • Expression profiles of adult T-cell leukemia-lymphoma and associations with clinical responses to zidovudine and interferon alpha LEUKEMIA & LYMPHOMA Alizadeh, A. A., Bohen, S. P., Lossos, C., Martinez-Climent, J. A., Ramos, J. C., Cubedo-Gil, E., Harrington, W. J., Lossos, I. S. 2010; 51 (7): 1200-1216

    Abstract

    Adult T-cell leukemia-lymphoma (ATLL) is an HTLV-1-associated lymphoproliferative malignancy that is frequently fatal. We compared gene expression profiles (GEPs) of leukemic specimens from nine patients with ATLL at the time of diagnosis and immediately after combination therapy with zidovudine (AZT) and interferon alpha (IFNalpha). GEPs were also related to genetic aberrations determined by comparative genomic hybridization. We identified several genes anomalously over-expressed in the ATLL leukemic cells at the mRNA level, including LYN, CSPG2, and LMO2, and confirmed LMO2 expression in ATLL cells at the protein level. In vivo AZT-IFNalpha therapy evoked a marked induction of interferon-induced genes accompanied by repression of cell-cycle regulated genes, including those encoding ribosomal proteins. Remarkably, patients not responding to AZT-IFNalpha differed most from responding patients in lower expression of these same IFN-responsive genes, as well as components of the antigen processing and presentation apparatus. Demonstration of specific gene expression signatures associated with response to AZT-IFNalpha therapy may provide novel insights into the mechanisms of action in ATLL.

    View details for DOI 10.3109/10428191003728628

    View details for Web of Science ID 000279485700008

    View details for PubMedID 20370541

  • Immunophenotypic features of acute myeloid leukemia with inv(3)(q21q26.2)/t(3;3)(q21;q26.2) LEUKEMIA RESEARCH Medeiros, B. C., Kohrt, H. E., Arber, D. A., Bangs, C. D., Cherry, A. M., Majeti, R., Kogel, K. E., Azar, C. A., Patel, S., Alizadeh, A. A. 2010; 34 (5): 594-597

    Abstract

    Immunophenotypic identification of myeloid specific antigens is an important diagnostic tool in the management of patients with acute myeloid leukemia (AML). These antigens allow determination of cell of origin and degree of differentiation of leukemia blasts. AML with inv(3)(q21q26.2)/t(3;3)(q21;q26.2) is a relatively rare subtype of AML. The immunophenotypic characteristics of inv(3) AML patients are somewhat limited. We identified 14 new cases of hematological disorders with increased myeloid blasts carrying inv(3)(q21q26.2)/t(3;3)(q21;q26.2). Also, we identified another 13 cases previously published in the literature, where the immunophenotype of inv(3)(q21q26.2) was documented. As a group, patients with AML with inv(3)(q21q26.2) had high levels of early myeloid (CD13, CD33, CD117 and MPO) and uncommitted markers (CD34, HLA-DR and CD56) and a high rate of monosomy 7 in addition to the inv(3)(q21q26.2). Differential karyotype and expression of certain antigens were noted in patients with de novo AML with inv(3)(q21q26.2) vs. those with inv(3)(q21q26.2)-containing blasts.

    View details for DOI 10.1016/j.leukres.2009.08.029

    View details for Web of Science ID 000276945300009

    View details for PubMedID 19781775

  • Is Time of the Essence in Adult Acute Myeloid Leukemia (AML)? Time to Blast Clearance and Time to Induction Therapy Fail to Predict Overall Survival (OS) Blood (e-Letter) Kohrt HE, Patel S, Ho M, Owen T, Majeti R, Gotlib JR, Coutre SE, Medeiros BC, Alizadeh AA. 2010; 113 (1): 28-36
  • Therapeutic effect of CD137 immunomodulation in lymphoma and its enhancement by T-reg depletion BLOOD Houot, R., Goldstein, M. J., Kohrt, H. E., Myklebust, J. H., Alizadeh, A. A., Lin, J. T., Irish, J. M., Torchia, J. A., Kolstad, A., Chen, L., Levy, R. 2009; 114 (16): 3431-3438

    Abstract

    Despite the success of passive immunotherapy with monoclonal antibodies (mAbs), many lymphoma patients eventually relapse. Induction of an adaptive immune response may elicit active and long-lasting antitumor immunity, thereby preventing or delaying recurrence. Immunomodulating mAbs directed against immune cell targets can be used to enhance the immune response to achieve efficient antitumor immunity. Anti-CD137 agonistic mAb has demonstrated antitumor efficacy in various tumor models and has now entered clinical trials for the treatment of solid tumors. Here, we investigate the therapeutic potential of anti-CD137 mAb in lymphoma. We found that human primary lymphoma tumors are infiltrated with CD137+ T cells. We therefore hypothesized that lymphoma would be susceptible to treatment with anti-CD137 agonistic mAb. Using a mouse model, we demonstrate that anti-CD137 therapy has potent antilymphoma activity in vivo. The antitumor effect of anti-CD137 therapy was mediated by both natural killer (NK) and CD8 T cells and induced long-lasting immunity. Moreover, the antitumor activity of anti-CD137 mAb could be further enhanced by depletion of regulatory T cell (T(regs)). These results support the evaluation of anti-CD137 therapy in clinical trials for patients with lymphoma.

    View details for DOI 10.1182/blood-2009-05-223958

    View details for Web of Science ID 000270834500013

    View details for PubMedID 19641184

  • A pluripotency signature predicts histological transformation and influences survival in follicular lymphoma patients Blood Gentles AJ**, Alizadeh AA** (contributed equally), Lee S, Myklebust JH, Shachaf CM, Shahbaba B, Levy R, Koller D, Plevritis SK. 2009
  • Evaluation and management of angioimmunoblastic T-cell lymphoma: a review of current approaches and future strategies. Clinical advances in hematology & oncology : H&O Alizadeh, A. A., Advani, R. H. 2008; 6 (12): 899-909

    Abstract

    Angioimmunoblastic T-cell lymphoma (AITL) is a rare and complex lymphoproliferative disorder, clinically characterized by widespread lymphadenopathy, extranodal disease, immune-mediated hemolysis, and polyclonal hypergammaglobulinemia. Significant progress has been made in the understanding of AITL since its recognition as a clonal T-cell disorder with associated deregulation of B-cells and endothelial cells within a unique malignant microenvironment. However, as the responses to conventional chemotherapy have not been durable, prognosis with current treatment approaches has remained dismal. Here we review the clinical presentation, prognosis, and management of patients with AITL. We discuss recent developments in the understanding of the pathogenesis of AITL at a cellular and molecular level, including the implication of the follicular helper T-cell as the corresponding cell of origin, the roles of Epstein-Barr virus, B-cell deregulation, angiogenesis, and other signaling pathways in AITL, and the therapeutic implications of these findings. Finally, we discuss recent clinical trials and novel treatment approaches in the management of patients with AITL.

    View details for PubMedID 19209140

  • Double trouble in follicular lymphoma: A rare and unusual synergy of oncogenes in the germinal center LEUKEMIA & LYMPHOMA Alizadeh, A. A., Lossos, I. S. 2008; 49 (3): 377-380

    View details for DOI 10.1080/10428190801947542

    View details for Web of Science ID 000253513300002

    View details for PubMedID 18297511

  • Diagnosis of a critical respiratory illness caused by human metapneumovirus by use of a pan-virus microarray JOURNAL OF CLINICAL MICROBIOLOGY Chiu, C. Y., Alizadeh, A. A., Rouskin, S., Merker, J. D., Yeh, E., Yagi, S., Schnurr, D., Patterson, B. K., Ganem, D., DeRisi, J. L. 2007; 45 (7): 2340-2343

    Abstract

    A pan-virus DNA microarray (Virochip) was used to detect a human metapneumovirus (hMPV) strain associated with a critical respiratory tract infection in an elderly adult with chronic lymphocytic leukemia. This infection had previously eluded diagnosis despite extensive microbiological testing for possible etiologic agents. The patient's hMPV strain did not grow in viral culture, and only one of five specific reverse transcription-PCR assays for hMPV was positive.

    View details for DOI 10.1128/JCM.00364-07

    View details for Web of Science ID 000248072900050

    View details for PubMedID 17494722

  • Cell-type specific gene expression profiles of leukocytes in human peripheral blood BMC GENOMICS Palmer, C., Diehn, M., Alizadeh, A. A., Brown, P. O. 2006; 7

    Abstract

    Blood is a complex tissue comprising numerous cell types with distinct functions and corresponding gene expression profiles. We attempted to define the cell type specific gene expression patterns for the major constituent cells of blood, including B-cells, CD4+ T-cells, CD8+ T-cells, lymphocytes and granulocytes. We did this by comparing the global gene expression profiles of purified B-cells, CD4+ T-cells, CD8+ T-cells, granulocytes, and lymphocytes using cDNA microarrays.Unsupervised clustering analysis showed that similar cell populations from different donors share common gene expression profiles. Supervised analyses identified gene expression signatures for B-cells (427 genes), T-cells (222 genes), CD8+ T-cells (23 genes), granulocytes (411 genes), and lymphocytes (67 genes). No statistically significant gene expression signature was identified for CD4+ cells. Genes encoding cell surface proteins were disproportionately represented among the genes that distinguished among the lymphocyte subpopulations. Lymphocytes were distinguishable from granulocytes based on their higher levels of expression of genes encoding ribosomal proteins, while granulocytes exhibited characteristic expression of various cell surface and inflammatory proteins.The genes comprising the cell-type specific signatures encompassed many of the genes already known to be involved in cell-type specific processes, and provided clues that may prove useful in discovering the functions of many still unannotated genes. The most prominent feature of the cell type signature genes was the enrichment of genes encoding cell surface proteins, perhaps reflecting the importance of specialized systems for sensing the environment to the physiology of resting leukocytes.

    View details for DOI 10.1186/1471-2164-7-115

    View details for Web of Science ID 000238364000001

    View details for PubMedID 16704732

  • Distinct IL-4-induced gene expression, proliferation, and intracellular signaling in germinal center B-cell-like and activated B-cell-like diffuse large-cell lymphomas BLOOD Lu, X. Q., Nechushtan, H., Ding, F. Y., Rosado, M. F., Singal, R., Alizadeh, A. A., Lossos, I. S. 2005; 105 (7): 2924-2932

    Abstract

    Diffuse large B-cell lymphomas (DLBCLs) can be subclassified into germinal center B-cell (GCB)-like and activated B-cell (ABC)-like tumors characterized by long and short survival, respectively. In contrast to ABC-like DLBCL, GCB-like tumors exhibit high expression of components of the interleukin 4 (IL-4) signaling pathway and of IL-4 target genes such as BCL6 and HGAL, whose high expression independently predicts better survival. These observations suggest distinct activity of the IL-4 signaling pathway in DLBCL subtypes. Herein, we demonstrate similar IL-4 expression but qualitatively different IL-4 effects on GCB-like and ABC-like DLBCL. In GCB-like DLBCL, IL-4 induces expression of its target genes, activates signal transducers and activators of transcription 6 (STAT6) signaling, and increases cell proliferation. In contrast, in the ABC-like DLBCL, IL-4 activates AKT, decreases cell proliferation by cell cycle arrest, and does not induce gene expression due to aberrant Janus kinase (JAK)-STAT6 signaling attributed to STAT6 dephosphorylation. We found distinct expression profiles of tyrosine phosphatases in DLBCL subtypes and identified putative STAT6 tyrosine phosphatases-protein tyrosine phosphatase nonreceptor type 1 (PTPN1) and PTPN2, whose expression is significantly higher in ABC-like DLBCL. These differences in tyrosine phosphatase expression might underlie distinct expression profiles of some of the IL-4 target genes and could contribute to a different clinical outcome of patients with GCB-like and ABC-like DLBCLs.

    View details for DOI 10.1182/blood-2004-10-3820

    View details for Web of Science ID 000228042900051

    View details for PubMedID 15591113

  • AID is expressed in germinal center B-cell-like and activated B-cell-like diffuse large-cell lymphomas and is not correlated with intraclonal heterogeneity LEUKEMIA Lossos, I. S., Levy, R., Alizadeh, A. A. 2004; 18 (11): 1775-1779

    Abstract

    Activation-induced cytidine deaminase (AID), highly expressed in germinal center (GC)-lymphocytes, is involved in somatic hypermutation (SHM). We examined AID expression in diffuse large B-cell lymphomas (DLBCL) of germinal center B-cell (GCB)-like and activated B-cell (ABC)-like subtypes. These two types of DLBCL are characterized by high and low expression of GC-specific genes, respectively. AID expression was detected in both GCB- and ABC-like DLBCL, thus demonstrating a dissociation between AID expression and that of other GC genes. We also tested for the presence of intraclonal heterogeneity in immunoglobulin and BCL6 genes in those same tumors and in follicle center lymphomas (FCL) that transformed to DLBCL. The level of AID expression did not correlate with the presence of intraclonal sequence heterogeneity in either IgV(H) or BCL6. Our findings suggest that lymphomas maintain some but not all of the gene expression signatures of their normal B-cell counterparts. The fact that AID expression can be elevated without intraclonal sequence heterogeneity raises the possibility that other factors are required for SHM in these tumors. We found decreased levels of AID expression in DLBCL that evolved from FCL and which had acquired new mutations in their BCL6 genes. This dissociation suggests that AID expression and SHM may occur at the time prior to the clinical detection of transformed lymphoma.

    View details for DOI 10.1038/sj.leu.2403488

    View details for Web of Science ID 000224732800006

    View details for PubMedID 15385936

  • Fludarabine treatment of patients with chronic lymphocytic leukemia induces a p53-dependent gene expression response BLOOD Rosenwald, A., Chuang, E. Y., Davis, R. E., Wiestner, A., Alizadeh, A. A., Arthur, D. C., Mitchell, J. B., Marti, G. E., Fowler, D. H., Wilson, W. H., Staudt, L. M. 2004; 104 (5): 1428-1434

    Abstract

    Fludarabine, the current standard treatment for B-cell chronic lymphocytic leukemia (CLL), can induce apoptosis in CLL cells in vitro, and a number of molecular mechanisms contribute to its cytotoxicity. Using gene expression profiling, we investigated the molecular consequences of fludarabine treatment of patients with CLL in vivo. In 7 patients with CLL, a consistent gene expression signature of in vivo fludarabine exposure was identified. Many of the fludarabine signature genes were known p53 target genes and genes involved in DNA repair. In vitro treatment of CLL cells with fludarabine induced the same set of genes as observed in vivo, and many of these genes were also induced by in vitro exposure of CLL cells to ionizing radiation. Using isogenic p53 wild-type and null lymphoblastoid cell lines, we confirmed that many of the fludarabine signature genes were also p53 target genes. Because in vivo treatment with fludarabine induces a p53-dependent gene expression response, fludarabine treatment has the potential to select p53-mutant CLL cells, which are more drug resistant and associated with an aggressive clinical course. These considerations suggest that fludarabine treatment should be given in strict accordance to the current National Cancer Institute (NCI) guidelines that have established criteria of disease activity that warrant treatment.

    View details for DOI 10.1182/blood-2003-09-3236

    View details for Web of Science ID 000223544000038

    View details for PubMedID 15138159

  • Prediction of survival in diffuse large-B-cell lymphoma based on the expression of six genes NEW ENGLAND JOURNAL OF MEDICINE Lossos, I. S., Czerwinski, D. K., Alizadeh, A. A., Wechser, M. A., Tibshirani, R., Botstein, D., Levy, R. 2004; 350 (18): 1828-1837

    Abstract

    Several gene-expression signatures can be used to predict the prognosis in diffuse large-B-cell lymphoma, but the lack of practical tests for a genome-scale analysis has restricted the use of this method.We studied 36 genes whose expression had been reported to predict survival in diffuse large-B-cell lymphoma. We measured the expression of each of these genes in independent samples of lymphoma from 66 patients by quantitative real-time polymerase-chain-reaction analyses and related the results to overall survival.In a univariate analysis, genes were ranked on the basis of their ability to predict survival. The genes that were the strongest predictors were LMO2, BCL6, FN1, CCND2, SCYA3, and BCL2. We developed a multivariate model that was based on the expression of these six genes, and we validated the model in two independent microarray data sets. The model was independent of the International Prognostic Index and added to its predictive power.Measurement of the expression of six genes is sufficient to predict overall survival in diffuse large-B-cell lymphoma.

    View details for Web of Science ID 000221080300006

    View details for PubMedID 15115829

  • Gene expression signature of fibroblast serum response predicts human cancer progression: similarities between tumors and wounds. PLoS biology Chang, H. Y., Sneddon, J. B., Alizadeh, A. A., Sood, R., West, R. B., Montgomery, K., Chi, J., van de Rijn, M., Botstein, D., Brown, P. O. 2004; 2 (2): E7-?

    Abstract

    Cancer invasion and metastasis have been likened to wound healing gone awry. Despite parallels in cellular behavior between cancer progression and wound healing, the molecular relationships between these two processes and their prognostic implications are unclear. In this study, based on gene expression profiles of fibroblasts from ten anatomic sites, we identify a stereotyped gene expression program in response to serum exposure that appears to reflect the multifaceted role of fibroblasts in wound healing. The genes comprising this fibroblast common serum response are coordinately regulated in many human tumors, allowing us to identify tumors with gene expression signatures suggestive of active wounds. Genes induced in the fibroblast serum-response program are expressed in tumors by the tumor cells themselves, by tumor-associated fibroblasts, or both. The molecular features that define this wound-like phenotype are evident at an early clinical stage, persist during treatment, and predict increased risk of metastasis and death in breast, lung, and gastric carcinomas. Thus, the transcriptional signature of the response of fibroblasts to serum provides a possible link between cancer progression and wound healing, as well as a powerful predictor of the clinical course in several common carcinomas.

    View details for PubMedID 14737219

  • Role of interleukin 6 in myocardial dysfunction of meningococcal septic shock LANCET Pathan, N., Hemingway, C. A., Alizadeh, A. A., Stephens, A. C., Boldrick, J. C., Oragui, E. E., McCabe, C., Welch, S. B., Whitney, A., O'Gara, P., Nadel, S., Relman, D. A., Harding, S. E., Levin, M. 2004; 363 (9404): 203-209

    Abstract

    Myocardial failure has a central role in the complex pathophysiology of septic shock and contributes to organ failure and death. During the sepsis-induced inflammatory process, specific factors are released that depress myocardial contractile function. We aimed to identify these mediators of myocardial depression in meningococcal septic shock.We combined gene-expression profiling with protein and cellular methods to identify a serum factor causing cardiac dysfunction in meningococcal septic shock. We identified genes that were significantly upregulated in blood after exposure to meningococci. We then selected for further analysis those genes whose protein products had properties of a myocardial depressant factor--specifically a 12-25 kDa heat-stable protein that is released into serum shortly after onset of meningococcal infection.We identified 174 significantly upregulated genes in meningococcus-infected blood: six encoded proteins that were of the predicted size and had characteristics of a myocardial depressant factor. Of these, interleukin 6 caused significant myocardial depression in vitro. Removal of interleukin 6 from serum samples of patients with meningococcaemia and from supernatants of inflammatory cells stimulated by meningococci in vitro abolished the negative inotropic activity. Furthermore, concentrations in serum of interleukin 6 strongly predicted degree of myocardial dysfunction and severity of disease in children with meningococcal septic shock.Interleukin 6 is a mediator of myocardial depression in meningococcal disease. This cytokine and its downstream mediators could be a target for future treatment strategies.

    View details for Web of Science ID 000188243900010

    View details for PubMedID 14738793

  • T cell receptor-independent basal signaling via Erk and Abl kinases suppresses RAG gene expression PLOS BIOLOGY Roose, J. P., Diehn, M., Tomlinson, M. G., Lin, J., Alizadeh, A. A., Botstein, D., Brown, P. O., Weiss, A. 2003; 1 (2): 271-287
  • T cell receptor-independent basal signaling via Erk and Abl kinases suppresses RAG gene expression. PLoS biology Roose, J. P., Diehn, M., Tomlinson, M. G., Lin, J., Alizadeh, A. A., Botstein, D., Brown, P. O., Weiss, A. 2003; 1 (2): E53-?

    Abstract

    Signal transduction pathways guided by cellular receptors commonly exhibit low-level constitutive signaling in a continuous, ligand-independent manner. The dynamic equilibrium of positive and negative regulators establishes such a tonic signal. Ligand-independent signaling by the precursors of mature antigen receptors regulates development of B and T lymphocytes. Here we describe a basal signal that controls gene expression profiles in the Jurkat T cell line and mouse thymocytes. Using DNA microarrays and Northern blots to analyze unstimulated cells, we demonstrate that expression of a cluster of genes, including RAG-1 and RAG-2, is repressed by constitutive signals requiring the adapter molecules LAT and SLP-76. This TCR-like pathway results in constitutive low-level activity of Erk and Abl kinases. Inhibition of Abl by the drug STI-571 or inhibition of signaling events upstream of Erk increases RAG-1 expression. Our data suggest that physiologic gene expression programs depend upon tonic activity of signaling pathways independent of receptor ligation.

    View details for PubMedID 14624253

  • Rheumatoid arthritis is a heterogeneous disease - Evidence for differences in the activation of the STAT-1 pathway between rheumatoid tissues ARTHRITIS AND RHEUMATISM Kraan, T. C., van Gaalen, F. A., Kasperkovitz, P. V., Verbeet, N. L., Smeets, T. J., Kraan, M. C., Fero, M., Tak, P. P., Huizinga, T. W., Pieterman, E., Breedveld, F. C., Alizadeh, A. A., Verweij, C. L. 2003; 48 (8): 2132-2145

    Abstract

    To generate a molecular description of synovial tissue from rheumatoid arthritis (RA) patients that would allow us to unravel novel aspects of pathogenesis and to identify different forms of disease.We applied complementary DNA microarray analysis to profile gene expression, with a focus on immune-related genes, in affected joint tissues from RA patients and in tissues from osteoarthritis (OA) patients as a control. To validate microarray data, real-time polymerase chain reaction was performed on genes of interest.The gene expression signatures of synovial tissues from RA patients showed considerable variability, resulting in the identification of at least two molecularly distinct forms of RA tissues. One class of tissues revealed abundant expression of clusters of genes indicative of an involvement of the adaptive immune response. Detailed analysis of the expression profile provided evidence for a prominent role of an activated signal transducer and activator of transcription 1 pathway in these tissues. The expression profiles of another group of RA tissues revealed an increased tissue remodeling activity and a low inflammatory gene expression signature. The gene expression pattern in the latter tissues was reminiscent of that observed in the majority of OA tissues.The differences in the gene expression profiles provide a unique perspective for distinguishing different pathogenetic RA subsets based on molecular criteria. These data reflect important aspects of molecular variation that are relevant for understanding the biologic dysregulation underlying these subsets of RA. This approach may also help to define homogeneous groups for clinical studies and evaluation of targeted therapies.

    View details for DOI 10.1002/art.11096

    View details for Web of Science ID 000184585000008

    View details for PubMedID 12905466

  • Transformation of follicular lymphoma to diffuse large cell lymphoma is associated with a heterogeneous set of DNA copy number and gene expression alterations BLOOD Martinez-Climent, J. A., Alizadeh, A. A., Segraves, R., Blesa, D., Rubio-Moscardo, F., Albertson, D. G., Garcia-Conde, J., Dyer, M. J., Levy, R., Pinkel, D., Lossos, I. S. 2003; 101 (8): 3109-3117

    Abstract

    Genomic aberrations in a series of paired biopsy samples from patients who presented initially with follicle center lymphoma (FCL) and subsequently transformed to diffuse large B-cell lymphoma (DLBCL) were measured by array comparative genomic hybridization (CGH). The consequences of these aberrations on gene expression were determined by comparison with expression analysis on these specimens using cDNA microarrays. A heterogeneous pattern of acquired genomic abnormalities was observed upon transformation, some of which were recurrent in small subsets of patients. Some of the genomic aberration acquired upon transformation, such as gain/amplification of 1q21-q24, 2p16 (REL/BCL11A gene loci), 3q27-q29 (including the BCL6 locus), 7q11.2-q22.1, 12pter-q12, 18q21 (including the BCL2 locus) and Xq, and deletion of 6q22-q24, 13q14-q21 and 17p13 (P53 locus) have been previously implicated in the FCL/DLBCL pathogenesis. In addition, novel genomic imbalances not previously reported in association with FCL transformation, such as overrepresentation of 4p12-pter, 5p12-p15, 6p12.3-p21, 9p23, 9q13-q31, 16q, 17q21, and loss of 1p36.3, 4q21-q23, 5q21-q23, 9q31-qter, 11q24-q25, and 15q23, were identified. We observed a differential expression profile of many genes within regions of gain and deletion upon transformation, including novel target genes associated with FCL transformation. However, other genes did not show deregulated expression despite their location within these areas. In summary, the combination of array CGH and expression analysis provides a more comprehensive picture of the transformation of FCL to DLBCL. This process is associated with the acquisition of a variable spectrum of genomic imbalances affecting recurrent chromosomal areas that harbor overexpressed or underexpressed genes targeted upon transformation.

    View details for DOI 10.1182/blood-2002-07-2119

    View details for Web of Science ID 000182101400038

    View details for PubMedID 12406872

  • Individuality and variation in gene expression patterns in human blood PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Whitney, A. R., Diehn, M., Popper, S. J., Alizadeh, A. A., Boldrick, J. C., Relman, D. A., Brown, P. O. 2003; 100 (4): 1896-1901

    Abstract

    The nature and extent of interindividual and temporal variation in gene expression patterns in specific cells and tissues is an important and relatively unexplored issue in human biology. We surveyed variation in gene expression patterns in peripheral blood from 75 healthy volunteers by using cDNA microarrays. Characterization of the variation in gene expression in healthy tissue is an essential foundation for the recognition and interpretation of the changes in these patterns associated with infections and other diseases, and peripheral blood was selected because it is a uniquely accessible tissue in which to examine this variation in patients or healthy volunteers in a clinical setting. Specific features of interindividual variation in gene expression patterns in peripheral blood could be traced to variation in the relative proportions of specific blood cell subsets; other features were correlated with gender, age, and the time of day at which the sample was taken. An analysis of multiple sequential samples from the same individuals allowed us to discern donor-specific patterns of gene expression. These data help to define human individuality and provide a database with which disease-associated gene expression patterns can be compared.

    View details for DOI 10.1073/pnas.252784499

    View details for Web of Science ID 000181073000082

    View details for PubMedID 12578971

  • HGAL is a novel interleukin-4-inducible gene that strongly predicts survival in diffuse large B-cell lymphoma BLOOD Lossos, I. S., Alizadeh, A. A., Rajapaksa, R., Tibshirani, R., Levy, R. 2003; 101 (2): 433-440

    Abstract

    We have cloned and characterized a novel human gene, HGAL (human germinal center-associated lymphoma), which predicts outcome in patients with diffuse large B-cell lymphoma (DLBCL). The HGAL gene comprises 6 exons and encodes a cytoplasmic protein of 178 amino acids that contains an immunoreceptor tyrosine-based activation motif (ITAM). It is highly expressed in germinal center (GC) lymphocytes and GC-derived lymphomas and is homologous to the mouse GC-specific gene M17. Expression of the HGAL gene is specifically induced in B cells by interleukin-4 (IL-4). Patients with DLBCL expressing high levels of HGAL mRNA demonstrate significantly longer overall survival than do patients with low HGAL expression. This association was independent of the clinical international prognostic index. High HGAL mRNA expression should be used as a prognostic factor in DLBCL.

    View details for Web of Science ID 000180384800010

    View details for PubMedID 12509382

  • Molecular heterogeneity in acute renal allograft rejection identified by DNA microarray profiling N Engl J Med Sarwal M, Chen X, Chua MS, Kambham N, Hsieh SC, Satterwhite T, Alizadeh AA, Masek M, Diehn, M, Salvatierra O Jr, Brown PO 2003; 349 (2): 125-38
  • Software tools for high-throughput analysis and archiving of immunohistochemistry staining data obtained with tissue microarrays AMERICAN JOURNAL OF PATHOLOGY Liu, C. L., Prapong, W., Natkunam, Y., Alizadeh, A., Montgomery, K., Gilks, C. B., van de Rijn, M. 2002; 161 (5): 1557-1565

    Abstract

    The creation of tissue microarrays (TMAs) allows for the rapid immunohistochemical analysis of thousands of tissue samples, with numerous different antibodies per sample. This technical development has created a need for tools to aid in the analysis and archival storage of the large amounts of data generated. We have developed a comprehensive system for high-throughput analysis and storage of TMA immunostaining data, using a combination of commercially available systems and novel software applications developed in our laboratory specifically for this purpose. Staining results are recorded directly into an Excel worksheet and are reformatted by a novel program (TMA-Deconvoluter) into a format suitable for hierarchical clustering analysis or other statistical analysis. Hierarchical clustering analysis is a powerful means of assessing relatedness within groups of tumors, based on their immunostaining with a panel of antibodies. Other analyses, such as generation of survival curves, construction of Cox regression models, or assessment of intra- or interobserver variation, can also be done readily on the reformatted data. Finally, the immunoprofile of a specific case can be rapidly retrieved from the archives and reviewed through the use of Stainfinder, a novel web-based program that creates a direct link between the clustered data and a digital image database. An on-line demonstration of this system is available at http://genome-www.stanford.edu/TMA/explore.shtml.

    View details for Web of Science ID 000179197000006

    View details for PubMedID 12414504

  • Genomic expression programs and the integration of the CD28 costimulatory signal in T cell activation PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Diehn, M., Alizadeh, A. A., Rando, O. J., Liu, C. L., Stankunas, K., Botstein, D., Crabtree, G. R., Brown, P. O. 2002; 99 (18): 11796-11801

    Abstract

    Optimal activation of T cells requires effective occupancy of both the antigen-specific T cell receptor and a second coreceptor such as CD28. We used cDNA microarrays to characterize the genomic expression program in human peripheral T cells responding to stimulation of these receptors. We found that CD28 agonists alone elicited few, but reproducible, changes in gene expression, whereas CD3 agonists elicited a multifaceted temporally choreographed gene expression program. The principal effect of simultaneous engagement of CD28 was to increase the amplitude of the CD3 transcriptional response. The induced genes whose expression was most enhanced by costimulation were significantly enriched for known targets of nuclear factor of activated T cells (NFAT) transcription factors. This enhancement was nearly abolished by blocking the nuclear translocation of NFATc by using the calcineurin inhibitor FK506. CD28 signaling promoted phosphorylation, and thus inactivation, of the NFAT nuclear export kinase glycogen synthase kinase-3 (GSK3), coincident with enhanced dephosphorylation of NFATc proteins. These results provide a detailed picture of the transcriptional program of T cell activation and suggest that enhancement of transcriptional activation by NFAT, through inhibition of its nuclear export, plays a key role in mediating the CD28 costimulatory signal.

    View details for DOI 10.1073/pnas.092284399

    View details for Web of Science ID 000177843100048

    View details for PubMedID 12195013

  • Transformation of follicular lymphoma to diffuse large-cell lymphoma: Alternative patterns with increased or decreased expression of c-myc and its regulated genes PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Lossos, I. S., Alizadeh, A. A., Diehn, M., Warnke, R., Thorstenson, Y., Oefner, P. J., Brown, P. O., Botstein, D., Levy, R. 2002; 99 (13): 8886-8891

    Abstract

    The natural history of follicular lymphoma (FL) is frequently characterized by transformation to a more aggressive diffuse large B cell lymphoma (DLBCL). We compared the gene-expression profiles between transformed DLBCL and their antecedent FL. No genes were observed to increase or decrease their expression in all of the cases of histological transformation. However, two different gene-expression profiles associated with the transformation process were defined, one in which c-myc and genes regulated by c-myc showed increased expression and one in which these same genes showed decreased expression. Further, there was a striking difference in gene-expression profiles between transformed DLBCL and de novo DLBCL, because the gene-expression profile of transformed DLBCL was more similar to their antecedent FL than to de novo DLBCL. This study demonstrates that transformation from FL to DLBCL can occur by alternative pathways and that transformed DLBCL and de novo DLBCL have very different gene-expression profiles that may underlie the different clinical behaviors of these two types of morphologically similar lymphomas.

    View details for DOI 10.1073/pnas.132253599

    View details for Web of Science ID 000176478200075

    View details for PubMedID 12077300

  • The t(14;18) defines a unique subset of diffuse large B-cell lymphoma with a germinal center B-cell gene expression profile BLOOD Huang, J. Z., Sanger, W. G., Greiner, T. C., Staudt, L. M., Weisenburger, D. D., Pickering, D. L., Lynch, J. C., Armitage, J. O., Wamke, R. A., Alizadeh, A. A., Lossos, I. S., Levy, R., Chan, W. C. 2002; 99 (7): 2285-2290

    Abstract

    Recently we have identified subgroups of de novo primary diffuse large B-cell lymphoma (DLBCL) based on complementary DNA microarray-generated gene expression profiles. To correlate the gene expression profiles with cytogenetic abnormalities in these DLBCLs, we examined the occurrence of the t(14;18)(q32;q21) in the 2 distinctive subgroups of DLBCL: one with the germinal center B-cell gene expression signature and the other with the activated B cell-like gene expression signature. The t(14;18) was detected in 7 of 35 cases (20%). All 7 t(14;18)-positive cases had a germinal center B-cell gene expression profile, representing 35% of the cases in this subgroup, and 6 of these 7 cases had very similar gene expression profiles. The expression of bcl-2 and bcl-6 proteins was not significantly different between the t(14;18)-positive and -negative cases, whereas CD10 was detected only in the group with the germinal center B-cell expression profile, and CD10 was most frequently expressed in the t(14;18)-positive cases. This study supports the validity of subdividing DLBCL into 2 major subgroups by gene expression profiling, with the t(14;18) being an important event in the pathogenesis of a subset of DLBCL arising from germinal center B cells. CD10 protein expression is useful in identifying cases of DLBCL with a germinal center B-cell gene expression profile and is often expressed in cases with the t(14;18).

    View details for Web of Science ID 000174559300002

    View details for PubMedID 11895757

  • In vivo regulation of human skeletal muscle gene expression by thyroid hormone GENOME RESEARCH Clement, K., Viguerie, N., Diehn, M., Alizadeh, A., Barbe, P., Thalamas, C., Storey, J. D., Brown, P. O., Barsh, G. S., Langin, D. 2002; 12 (2): 281-291

    Abstract

    Thyroid hormones are key regulators of metabolism that modulate transcription via nuclear receptors. Hyperthyroidism is associated with increased metabolic rate, protein breakdown, and weight loss. Although the molecular actions of thyroid hormones have been studied thoroughly, their pleiotropic effects are mediated by complex changes in expression of an unknown number of target genes. Here, we measured patterns of skeletal muscle gene expression in five healthy men treated for 14 days with 75 microg of triiodothyronine, using 24,000 cDNA element microarrays. To analyze the data, we used a new statistical method that identifies significant changes in expression and estimates the false discovery rate. The 381 up-regulated genes were involved in a wide range of cellular functions including transcriptional control, mRNA maturation, protein turnover, signal transduction, cellular trafficking, and energy metabolism. Only two genes were down-regulated. Most of the genes are novel targets of thyroid hormone. Cluster analysis of triiodothyronine-regulated gene expression among 19 different human tissues or cell lines revealed sets of coregulated genes that serve similar biologic functions. These results define molecular signatures that help to understand the physiology and pathophysiology of thyroid hormone action.

    View details for Web of Science ID 000173689600008

    View details for PubMedID 11827947

  • Stereotyped and specific gene expression programs in human innate immune responses to bacteria PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Boldrick, J. C., Alizadeh, A. A., Diehn, M., Dudoit, S., Liu, C. L., Belcher, C. E., Botstein, D., Staudt, L. M., Brown, P. O., Relman, D. A. 2002; 99 (2): 972-977

    Abstract

    The innate immune response is crucial for defense against microbial pathogens. To investigate the molecular choreography of this response, we carried out a systematic examination of the gene expression program in human peripheral blood mononuclear cells responding to bacteria and bacterial products. We found a remarkably stereotyped program of gene expression induced by bacterial lipopolysaccharide and diverse killed bacteria. An intricately choreographed expression program devoted to communication between cells was a prominent feature of the response. Other features suggested a molecular program for commitment of antigen-presenting cells to antigens captured in the context of bacterial infection. Despite the striking similarities, there were qualitative and quantitative differences in the responses to different bacteria. Modulation of this host-response program by bacterial virulence mechanisms was an important source of variation in the response to different bacteria.

    View details for Web of Science ID 000173450100078

    View details for PubMedID 11805339

  • Relation of gene expression phenotype to immunoglobulin mutation genotype in B cell chronic lymphocytic leukemia JOURNAL OF EXPERIMENTAL MEDICINE Rosenwald, A., Alizadeh, A. A., Widhopf, G., Simon, R., Davis, R. E., Yu, X., Yang, L. M., Pickeral, O. K., Rassenti, L. Z., Powell, J., Botstein, D., Byrd, J. C., Grever, M. R., Cheson, B. D., CHIORAZZI, N., Wilson, W. H., Kipps, T. J., Brown, P. O., Staudt, L. M. 2001; 194 (11): 1639-1647

    Abstract

    The most common human leukemia is B cell chronic lymphocytic leukemia (CLL), a malignancy of mature B cells with a characteristic clinical presentation but a variable clinical course. The rearranged immunoglobulin (Ig) genes of CLL cells may be either germ-line in sequence or somatically mutated. Lack of Ig mutations defined a distinctly worse prognostic group of CLL patients raising the possibility that CLL comprises two distinct diseases. Using genomic-scale gene expression profiling, we show that CLL is characterized by a common gene expression "signature," irrespective of Ig mutational status, suggesting that CLL cases share a common mechanism of transformation and/or cell of origin. Nonetheless, the expression of hundreds of other genes correlated with the Ig mutational status, including many genes that are modulated in expression during mitogenic B cell receptor signaling. These genes were used to build a CLL subtype predictor that may help in the clinical classification of patients with this disease.

    View details for Web of Science ID 000172659500009

    View details for PubMedID 11733578

  • Towards a novel classification of human malignancies based on gene expression patterns JOURNAL OF PATHOLOGY Alizadeh, A. A., Ross, D. T., Perou, C. M., van de Rijn, M. 2001; 195 (1): 41-52

    Abstract

    As a result of progress on the human genome project, approximately 19 000 genes have been identified and tens of thousands more tentatively identified as partial fragments of genes termed expressed sequence tags (ESTs). Most of these genes are only partially characterized and the functions of the vast majority are as yet unknown. It is likely that many genes that might be useful for diagnosis and/or prognostication of human malignancies have yet to be recognized. The advent of cDNA microarray technology now allows the efficient measurement of expression for almost every gene in the human genome in a single overnight hybridization experiment. This genomic scale approach has begun to reveal novel molecular-based sub-classes of tumours in breast carcinoma, colon carcinoma, lymphoma, leukaemia, and melanoma. In several instances, gene microarray analysis has already identified genes that appear to be useful for predicting clinical behaviour. This review discusses some recent findings using gene microarray technology and describes how this and related technologies are likely to contribute to the emergence of novel molecular classifications of human malignancies.

    View details for Web of Science ID 000171160100006

    View details for PubMedID 11568890

  • Ongoing immunoglobulin somatic mutation in germinal center B cell-like but not in activated B cell-like diffuse large cell lymphomas PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Lossos, I. S., Alizadeh, A. A., Eisen, M. B., Chan, W. C., Brown, P. O., Botstein, D., Staudt, L. M., Levy, R. 2000; 97 (18): 10209-10213

    Abstract

    B cell diffuse large cell lymphoma (B-DLCL) is a heterogeneous group of tumors, based on significant variations in morphology, clinical presentation, and response to treatment. Gene expression profiling has revealed two distinct tumor subtypes of B-DLCL: germinal center B cell-like DLCL and activated B cell-like DLCL. In a separate study, we determined that B-DLCL can also be subdivided into two groups based on the presence or absence of ongoing Ig gene hypermutation. Here, we evaluated the correlation between these B-DLCL subtypes established by the two different methods. Fourteen primary B-DLCL cases were studied by gene expression profiling using DNA microarrays and for the presence of ongoing mutations in their Ig heavy chain gene. All seven cases classified as germinal center B cell-like DLCL by gene expression showed the presence of ongoing mutations in the Ig genes. Five of the seven cases classified by gene expression as activated B cell-like DLCL had no ongoing somatic mutations, whereas, in the remaining two cases, a single point mutation was observed in only 2 of 15 and 21 examined molecular clones of variable heavy (V(H)) chain gene, respectively. These two cases were distantly related to the rest of the activated B cell-like DLCL tumors by gene expression. Our findings validate the concept that lymphoid malignancies are derived from cells at discrete stages of normal lymphocyte maturation and that the malignant cells retain the genetic program of those normal cells.

    View details for Web of Science ID 000089067500071

    View details for PubMedID 10954754

  • Examining the living genome in health and disease with DNA microarrays JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION Diehn, M., Alizadeh, A. A., Brown, P. O. 2000; 283 (17): 2298-2299

    View details for Web of Science ID 000086671600042

    View details for PubMedID 10807394

  • Genomic-scale gene expression profiling of normal and malignant immune cells CURRENT OPINION IN IMMUNOLOGY Alizadeh, A. A., Staudt, L. M. 2000; 12 (2): 219-225

    Abstract

    Gene expression variation is critical for the normal development and physiology of immune cells. Using cDNA microarrays, a systematic, genomic-scale view of gene expression in immune cells at many stages of differentiation and activation can be obtained. From the high vantagepoint provided by this technology, the gene expression physiology of immune cells appears remarkably ordered and logical. Each stage of lymphocyte differentiation can be defined by a characteristic gene expression signature. Genes that are co-regulated over hundreds of experimental conditions often encode functionally related proteins. Gene expression profiles also provide unprecedented ability to define the molecular and functional relationships between normal and malignant lymphocyte cell populations.

    View details for Web of Science ID 000085786300016

    View details for PubMedID 10712950

  • 'Gene shaving' as a method for identifying distinct sets of genes with similar expression patterns. Genome biology Hastie, T., Tibshirani, R., Eisen, M. B., Alizadeh, A., Levy, R., Staudt, L., Chan, W. C., Botstein, D., BROWN, P. 2000; 1 (2): RESEARCH0003-?

    Abstract

    Large gene expression studies, such as those conducted using DNA arrays, often provide millions of different pieces of data. To address the problem of analyzing such data, we describe a statistical method, which we have called 'gene shaving'. The method identifies subsets of genes with coherent expression patterns and large variation across conditions. Gene shaving differs from hierarchical clustering and other widely used methods for analyzing gene expression studies in that genes may belong to more than one cluster, and the clustering may be supervised by an outcome measure. The technique can be 'unsupervised', that is, the genes and samples are treated as unlabeled, or partially or fully supervised by using known properties of the genes or samples to assist in finding meaningful groupings.We illustrate the use of the gene shaving method to analyze gene expression measurements made on samples from patients with diffuse large B-cell lymphoma. The method identifies a small cluster of genes whose expression is highly predictive of survival.The gene shaving method is a potentially useful tool for exploration of gene expression data and identification of interesting clusters of genes worth further investigation.

    View details for PubMedID 11178228

  • Genome-wide analysis of DNA copy-number changes using cDNA microarrays NATURE GENETICS Pollack, J. R., Perou, C. M., Alizadeh, A. A., Eisen, M. B., Pergamenschikov, A., Williams, C. F., Jeffrey, S. S., Botstein, D., Brown, P. O. 1999; 23 (1): 41-46

    Abstract

    Gene amplifications and deletions frequently contribute to tumorigenesis. Characterization of these DNA copy-number changes is important for both the basic understanding of cancer and its diagnosis. Comparative genomic hybridization (CGH) was developed to survey DNA copy-number variations across a whole genome. With CGH, differentially labelled test and reference genomic DNAs are co-hybridized to normal metaphase chromosomes, and fluorescence ratios along the length of chromosomes provide a cytogenetic representation of DNA copy-number variation. CGH, however, has a limited ( approximately 20 Mb) mapping resolution, and higher-resolution techniques, such as fluorescence in situ hybridization (FISH), are prohibitively labour-intensive on a genomic scale. Array-based CGH, in which fluorescence ratios at arrayed DNA elements provide a locus-by-locus measure of DNA copy-number variation, represents another means of achieving increased mapping resolution. Published array CGH methods have relied on large genomic clone (for example BAC) array targets and have covered only a small fraction of the human genome. cDNAs representing over 30,000 radiation-hybrid (RH)-mapped human genes provide an alternative and readily available genomic resource for mapping DNA copy-number changes. Although cDNA microarrays have been used extensively to characterize variation in human gene expression, human genomic DNA is a far more complex mixture than the mRNA representation of human cells. Therefore, analysis of DNA copy-number variation using cDNA microarrays would require a sensitivity of detection an order of magnitude greater than has been routinely reported. We describe here a cDNA microarray-based CGH method, and its application to DNA copy-number variation analysis in breast cancer cell lines and tumours. Using this assay, we were able to identify gene amplifications and deletions genome-wide and with high resolution, and compare alterations in DNA copy number and gene expression.

    View details for Web of Science ID 000082337300013

    View details for PubMedID 10471496

  • Probing lymphocyte biology by genomic-scale gene expression analysis JOURNAL OF CLINICAL IMMUNOLOGY Alizadeh, A., Eisen, M., Botstein, D., Brown, P. O., Staudt, L. M. 1998; 18 (6): 373-379

    Abstract

    The identity and abundance of mRNA species within a cell dictate, to a large extent, the biological potential of that cell. Although posttranscriptional mechanisms modify protein expression in critical ways, cellular differentiation requires key changes in gene transcription, as evidenced by the potent phenotypes that result from disruption of transcription factor genes in mice. It is now possible to assess the mRNA profile of a cell globally using recently developed genomics techniques. This review focuses on the potential of cDNA microarrays to define gene expression in lymphoid cells, a field which is in its infancy. Examples of cellular activation genes and cytokine inducible genes discovered using this technology are presented but these represent only a taste of the fruit that this new technology will ultimately bear. Gene expression profiles should provide essential new insights into lymphocyte differentiation and activation, the pathogenesis of immune disorders, and the molecular abnormalities in lymphoid malignancies.

    View details for Web of Science ID 000077438400001

    View details for PubMedID 9857281

Conference Proceedings


  • Hierarchy in Somatic Mutations Arising During Genomic Evolution and Progression of Follicular Lymphoma Green, M. R., Gentles, A. J., Nair, R. V., Irish, J. M., Levy, R., Alizadeh, A. A. AMER SOC HEMATOLOGY. 2012
  • Systematic Deconvolution of Hematolymphoid Tumor Transcriptomes Reveals Infiltrating Immune Cell Signatures Related to Survival Newman, A. M., Gentles, A. J., Plevritis, S. K., Alizadeh, A. A. AMER SOC HEMATOLOGY. 2012
  • Genome-Wide Characterization of Human Hematopoietic Progenitor Cell Heterogeneity by Expression Profiling of Single Cells: A Pilot Study Liu, C. L., Dai, B., Newman, A. M., Majeti, R., Alizadeh, A. A. AMER SOC HEMATOLOGY. 2012
  • Identification of Candidate Transcriptional Biomarkers Associated with Chronic Graft-Versus-Host Disease Following Allogeneic Hematopoietic Cell Transplantation Kohrt, H. E., Tian, L., Li, L., Alizadeh, A. A., Hsieh, S., Strober, S., Sarwal, M., Lowsky, R. AMER SOC HEMATOLOGY. 2012
  • Targeting B-Cell Lymphoma with Idiotype-Specific Peptibodies: Toward a Personalized and Tumor-Specific Therapy Torchia, J. A., Ng, P. P., Chen, H., Kohrt, H. E., Marabelle, A., Alizadeh, A. A., Levy, R. AMER SOC HEMATOLOGY. 2012
  • Cell-free DNA as a Biomarker of Residual Disease Following Radiation Therapy for Non-small Cell Lung Cancer Bratman, S. V., Eclov, N. C., Modlin, L. A., Neal, J., Loo, B. W., Wu, G., Richardson, K., Newman, A. M., Alizadeh, A., Diehn, M. ELSEVIER SCIENCE INC. 2012: S713-S713
  • The chemoattractant chemerin as a natural tumor suppressive cytokine. Pachynski, R. K., Zabel, B., Tejeda, N., Monnier, J., Holzer, A. K., Gentles, A., Kohrt, H. E., Hadeiba, H., Alizadeh, A. A., Butcher, E. AMER SOC CLINICAL ONCOLOGY. 2012
  • Immunotransplant for Mantle Cell Lymphoma: Phase I/II Study Preliminary Results Brody, J. D., Czerwinski, D. K., Carlton, V., Moorhead, M., Zheng, J., Klinger, M., Faham, M., Advani, R., Kohrt, H. E., Alizadeh, A. A., Negrin, R. S., Weng, W., Sheehan, K., Levy, R. AMER SOC HEMATOLOGY. 2011: 1323-1323
  • NF-kappa B Signaling In Response to CpG Stratifies Mantle Cell Lymphoma Patient Outcome Myklebust, J. H., Irish, J. M., Brody, J., Alizadeh, A. A., Czerwinski, D., Houot, R., Kohrt, H. E., Kolstad, A., Levy, R. AMER SOC HEMATOLOGY. 2010: 67-68
  • Prediction of Survival In Diffuse Large B-Cell Lymphoma Based On the Expression of Two Genes Reflecting Tumor and Microenvironment Alizadeh, A. A., Gentles, A. J., Alencar, A. J., Kohrt, H. E., Houot, R., Goldstein, M. J., Zhao, S., Natkunam, Y., Advani, R., Gascoyne, R. D., Briones, J., Tibshirani, R. J., Myklebust, J. H., Plevritis, S. K., Lossos, I. S., Levy, R. AMER SOC HEMATOLOGY. 2010: 836-837
  • Noninvasive Prediction of Graft-Verus-Host Disease Following Allogeneic Hematopoietic Cell Transplantation by Gene Expression Profiling Kohrt, H. E., Li, L., Alizadeh, A. A., Goldstein, M. J., Strober, S., Sarwal, M., Lowsky, R. AMER SOC HEMATOLOGY. 2010: 393-394
  • Self-Antigen Recognition by the B Cell Receptors of Follicular Lymphoma Layn, K., Alizadeh, A. A., Kattah, N., Levy, S., Levy, R. AMER SOC HEMATOLOGY. 2010: 1678-1679
  • Clinical and Pathological Features of Non-Hodgkin Lymphomas Harboring Concurrent t(14;18) and 8q24 Anomalies Alizadeh, A. A., Anderson, M., Kohrt, H. E., Shyam, R. M., Bangs, C. D., Cherry, A. M., Advani, R., Natkunam, Y., Levy, R. AMER SOC HEMATOLOGY. 2010: 1291-1292
  • Noninvasive Prediction of Graft-Versus-Host Disease Following Allogeneic Hematopoietic Cell Transplantation by Gene Expression Profiling. Li, L., Kohrt, H., Heish, S., Alizadeh, A., Laport, G., Shizuru, J., Negrin, R., Strober, S., Lowsky, R., Sarwal, M. WILEY-BLACKWELL. 2010: 483-483
  • Therapeutic Antibody Targeting of CD47 Synergizes with Rituximab to Completely Eradicate Human B-Cell Lymphoma Xenografts Chao, M. P., Alizadeh, A. A., Tang, C. Z., Myklebust, J. H., Varghese, B., Jan, M., Levy, R., Weissman, I. L., Majeti, R. AMER SOC HEMATOLOGY. 2009: 1063-1064
  • Gene Expression Signature of Host Immune Response Is Predictive of Follicular Lymphoma Patient Survival in Independent Cohorts, and Correlates with Transformation to Diffuse Large B-Cell Lymphoma. Alizadeh, A. A., Gentles, A. J., Plevritis, S. K., Levy, R. AMER SOC HEMATOLOGY. 2009: 1153-1153
  • Prediction of Survival in Diffuse Large B-Cell Lymphoma Based On the Expression of Two Genes: Integration of Tumor and Microenvironment Contributions Alizadeh, A. A., Gentles, A. J., Alencar, A. J., Kohrt, H. E., Houot, R., Talreja, N., Shyam, R., Natkunam, Y., Gascoyne, R. D., Briones, J., Advani, R., Lossos, I. S., Levy, R. AMER SOC HEMATOLOGY. 2009: 258-258
  • Is Time of the Essence in Adult Acute Myeloid Leukemia (AML)? Time to Blast Clearance and Time to Induction Therapy Fail to Predict Overall Survival (OS). Kohrt, H. E., Patel, S., Ho, M., Owen, T., Majeti, R., Gotlib, J. R., Coutre, S., Medeiros, B. C., Alizadeh, A. A. AMER SOC HEMATOLOGY. 2009: 646-647
  • Early Mortality in Acute Promyelocytic Leukemia May Be Higher Than Previously Reported. Alizadeh, A. A., McClellan, J. S., Gotlib, J. R., Coutre, S., Majeti, R., Kohrt, H. E., Medeiros, B. C. AMER SOC HEMATOLOGY. 2009: 420-421
  • A Subpopulation of Follicular Lymphoma Tumor Infiltrating T Cells Shows Suppressed Common Gamma Chain Cytokine Signaling Myklebust, J. H., Irish, J. M., Houot, R., Brody, J., Czerwinski, D. K., Alizadeh, A. A., Kolstad, A., Levy, R. AMER SOC HEMATOLOGY. 2009: 316-316
  • Therapeutic Potential of Anti-CD137 Antibody in Lymphoma Houot, R., Goldstein, M. J., Kohrt, H. E., Myklebust, J. H., Alizadeh, A. A., Lin, J. T., Irish, J. M., Torchia, J. A., Kolstad, A., Chen, L., Levy, R. AMER SOC HEMATOLOGY. 2009: 301-302
  • CD47 IS AN ADVERSE PROGNOSTIC FACTOR IN NON-HODGKIN LYMPHOMA AND A THERAPEUTIC ANTIBODY TARGET THAT SYNERGIZES WITH RITUXIMAB Chao, M. P., Alizadeh, A., Tang, C. Z., Jan, M., Levy, R., Majeti, R., Weissman, I. L. ELSEVIER SCIENCE INC. 2009: S8-S9
  • CD47 Is An Independent Prognostic Factor and Therapeutic Antibody Target on Human Acute Myeloid Leukemia Stem Cells Majeti, R., Chao, M. P., Alizadeh, A. A., Pang, W. W., Weissman, I. L. AMER SOC HEMATOLOGY. 2008: 284-284
  • LMO2 Protein Expression Predicts Survival in Patients with Diffuse Large B-Cell Lymphoma Treated with Immunochemotherapy (RCHOP): A Multicenter Validation Study. Advani, R., Talreja, N., Tibshirani, R., Zhao, S., Alizadeh, A., Briones, J., Bordes, R., Cohen, J., Horning, S., Levy, R., Lossos, I. S., Natkunam, Y. AMER SOC HEMATOLOGY. 2008: 1291-1291
  • Genomic analysis of renal allograft dysfunction using cDNA microarrays Sarwal, M., Chang, S., Barry, C., Chen, X., Alizadeh, A., Salvatierra, O., BROWN, P. ELSEVIER SCIENCE INC. 2001: 297-298

    View details for Web of Science ID 000167629900133

    View details for PubMedID 11266826

  • Exploring gene expression signatures of host responses to infection Boldrick, J. C., Belcher, C. E., Alizadeh, A. A., Liu, C. L., Diehn, M., Brown, P. O., Relman, D. A. OXFORD UNIV PRESS INC. 2000: 218-218
  • Gene expression in large B-cell lymphoma using cDNA microarray technology. Chan, W. C., Alizadeh, A., Eisen, M., Davis, R. E., Ma, C., Sabet, H., Tran, T., Powell, J. I., Yang, L., Greiner, T. C., Weisenburger, D. D., Armitage, J. O., Marti, G. E., Moores, T., Hudson, J., Lossos, I., Warnke, R., Levy, R., Botstein, D., Brown, P. O., Staudt, L. M. AMER SOC HEMATOLOGY. 1999: 698A-698A

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