Phase I Study of GNKG168 in Acute Lymphoblastic Leukemia and Acute Myelogenous Leukemia

Inclusion Criteria:

   - Patients must be ≥1 and ≤ 21 years of age when originally diagnosed with ALL or AML.

   - Diagnosis

      1. Patients must have previously histologically confirmed ALL or AML at original
      diagnosis or previous relapse.

      2. Patients must be in complete remission (CR) with less than 5% blasts in the bone
      marrow.

   - Post-HSCT patients should be in first or greater CR

   - Patients who have never received HSCT should be in second or greater CR c. Patient
   must have detectable MRD (≥0.01%) by flow cytometry as confirmed by Brent Woods' lab.
   Results must be available at the time of enrollment.

   - Karnofsky ≥ 50% for patients >16 years of age and Lansky ≥ 50% for patients ≤16 years
   of age. (See Appendix I for Performance Scales)

   - Patients must have fully recovered from the acute toxic effects of all prior
   anti-cancer therapy.

   - At least 14 days must have elapsed since any treatment with systemic chemotherapy
   including high-dose steroid (prednisone>0.5 mg/kg or equivalent), radiotherapy,
   biological therapy or any other investigational therapy. (Note: low-dose steroid;
   prednisone ≤0.5 mg/kg/day or equivalent is allowed.)

   - Patients who have never had a Hematopoietic Stem Cell Transplant (HSCT) must not be a
   suitable candidate for HSCT.

   - Previous Hematopoietic Stem Cell Transplant:

      1. Patients having received HSCT are eligible.

      2. Patients having received donor lymphocyte infusions (DLI) are eligible.

      3. At least 60 days must have elapsed from the last DLI.

      4. Must have ≥95% donor T-cell chimerism.

      5. Patients must have been off all immune suppression drugs for 7 days before study
      entry. (at least 2 weeks for high-dose steroid, i.e. prednisone>0.5 mg/kg or
      equivalent; see section 3.3.4 b) (Note; low-dose steroid; prednisone ≤0.5
      mg/kg/day or equivalent is allowed.)

   - Patients must have a serum creatinine that is less than or equal to 1.5 x the
   institutional upper limit of normal according to age.

   - Patient's alanine aminotransferase (ALT) and aspartate aminotransferase (AST) must be
   less than or equal to 3 x institutional upper limit of normal.

   - Patient's total bilirubin must be less than or equal to 1.5 x institutional upper
   limit of normal.

   - Patient must have a shortening fraction > 27% or an ejection fraction > 45% by
   echocardiogram (ECHO) or multigated radionuclide angiography (MUGA) .

   - Female patients of childbearing potential must have a negative urine or serum
   pregnancy test confirmed prior to enrollment.

   - Female patients with infants must agree not to breastfeed their infants while on this
   study.

   - Male and female patients of child-bearing potential must agree to use an effective
   method of contraception approved by the investigator during the study.

   - Patients must have an absolute neutrophil count > 1000/dL, platelets > 100,000/dL AND
   absolute lymphocyte count > 200 which is not decreasing. Patients with previous HSCT
   may have a platelet count > 50,000/dL.

Exclusion Criteria:

   - Active grade 2 or higher acute GVHD at the time of study entry.

   - Active chronic GVHD (moderate or severe). See Appendix 2 for Chronic GVHD Grading.

   - Plan for donor lymphocyte infusions during the study period.

   - Need for immunosuppressive medications including high-dose corticosteroids (prednisone
   >0.5 mg/kg or equivalent) (Note: low-dose steroid; prednisone ≤0.5 mg/kg/day or
   equivalent is allowed.)

   - Patients with a systemic fungal, bacterial, viral, or other infection not controlled
   (defined as exhibiting ongoing signs/symptoms related to the infection and without
   improvement, despite appropriate antibiotics or other treatment).

   - Patient will be excluded if they are currently receiving other investigational drugs.

   - Patients will be excluded if there is a plan to administer non-protocol chemotherapy,
   radiation therapy, or immunotherapy during the study period.

   - Patients will be excluded if they have significant concurrent disease, illness,
   psychiatric disorder or social issue that would compromise patient safety or
   compliance with the prescribed protocol therapy, interfere with consent, study
   participation, follow up, or interpretation of study results.

   - Patients with central nervous system 3 disease are excluded.