School of Medicine


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  • Jeroen Paul Jansen

    Jeroen Paul Jansen

    Adjunct Professor, Health Research and Policy - Epidemiology

    Bio Jeroen’s expertise is evidence synthesis and cost-effectiveness evaluations in a variety of disease states. His current interests are statistical methods for evidence synthesis and the development of open-source simulation and decision models to facilitate value assessment of medical interventions. Jeroen has performed applied and methods research in his areas of expertise. Notable contributions are the development of synthesis methods to overcome the typical challenges in cost-effectiveness evaluations characterized by gaps in the evidence base and complex evidence structures. Furthermore, he led initiatives to develop guidance for consumers and producers of network meta-analysis studies. He is a co-author of a textbook on network meta-analysis for decision-making. Jeroen has a PhD in epidemiology from the Erasmus University in the Netherlands.

  • Esther M. John

    Esther M. John

    Professor (Research) of Medicine (Oncology) and, by courtesy, of Health Research and Policy (Epidemiology)

    Current Research and Scholarly Interests Dr. John has extensive expertise in conducting population-based epidemiologic studies and has led as Principal Investigator multiple large-scale studies, including multi-center studies with a study site in the San Francisco Bay Area with its diverse population. Many of her studies and collaborations investigated cancer health disparities. Her research has focused on the role of modifiable lifestyle factors (e.g., body size, physical activity, diet), hormonal factors, early-life exposures, genetic variants, and gene-environment interactions; differences in risk factors by race/ethnicity, breast cancer subtypes, and prostate cancer subtypes; risk factors for familial breast cancer and second primary breast cancer, as well as prognostic factors related to survival disparities.

    As Principal Investigator, Dr. John has led a number of studies conducted in the San Francisco Bay Area, including:

    - the Northern California site of the Breast Cancer Family Registry, an on-going prospective multi-generational cohort of over 13,000 families established in 1995 at six international sites;
    - the Northern California site of the WECARE Study that investigates risk factors for second primary breast cancer;
    - the California site of the Breast Cancer Health Disparities Study that investigated genetic variability and breast cancer risk and survival in Hispanic and non-Hispanic white populations in the context of genetic admixture;
    - the Breast Cancer Etiology in Minorities (BEM) Study, a pooled analysis of risk factors for breast cancer subtypes in racial/ethnic minorities;
    - the San Francisco Bay Area Breast Cancer Study, a population-based case-control study in nearly 5,000 Hispanic, African American and non-Hispanic white women that investigated the role of modifiable lifestyle factors and other risk factors;
    - the San Francisco Bay Area Prostate Cancer Study, a population-based case-control study of lifestyle and genetic risk factors for advanced and localized disease.

    These studies collected and pooled extensive data and biospecimens and continue to support numerous ancillary studies, collaborations and international consortia and have contributed to a better understanding of cancer risk and survival in racial/ethnic minority populations.

    Dr. John is also a founding PI of the LEGACY Girls Study, an on-going prospective cohort established in 2011 that investigates early life exposures in relation to pubertal development outcomes, breast tissue characteristics, and behavioral and psychosocial outcomes in the context of having a family history or breast cancer.