Metabolically Optimized, Non-cytotoxic Low Dose Weekly Decitabine/Venetoclax in MDS and AML

The combination of Azacitidine and venetoclax (Aza/Ven) is FDA approved for patients AML \> 75 and/or unfit for induction chemotherapy. However, majority of patients receiving standard dosing of Aza/Ven require dose interruptions, treatment delays and dose reductions. In addition, Aza/ven has limited activity in various subgroups of myeloid malignancies such as P53 mutant MDS/AML. In the initial safety and tolerability phase of the study, 33 patients will be enrolled on this study, accounting for need for replacement subjects to evaluate endpoints. In the second expansion phase of the study up to 91 patients (including patients from the 1st stage), will be enrolled to obtain additional safety, tolerability and preliminary efficacy of the low dose regimen in selected subsets of patients with myeloid malignancies. As treatment with Hypomethylating agents (HMAs) requires extended drug exposure for efficacy, patients who do not complete 12 weeks of therapy for reasons other than disease progression or those who do not complete therapy due to toxicity or those who screen fail and do not start therapy, will be replaced. Any patient who starts therapy will be evaluable for safety. In the absence of overt disease progression or dose limiting toxicity, patients would be anticipated to remain on treatment for at least 12 weeks. After 12 weeks, patient may continue therapy if felt to be experiencing clinical benefit. The severe cytopenias encountered with Aza/ven is particularly challenging for patients with poor hematopoietic bone marrow reserve such as MDS and myelofibrosis (MF). Also some elderly patients with comorbidities cannot tolerate the prolonged cytopenias caused by Aza/ven. This pilot clinical trial will evaluate the tolerability of a non-cytotoxic regimen for patients with myeloid malignancies who either cannot tolerate or are not known to benefit from standard Aza/Ven dosing. This will be a single arm, open label pilot study of weekly dosing of subcutaneous decitabine and venetoclax. Patients will be treated for a minimum of 12 weeks in the absence of clear evidence of progressive disease. Patients who have any response will be permitted to continue treatment until relapse or progression of disease. Decitabine is given at a dose of 0.1-0.2 mg/kg/day for 1-2 days per week. All patients will receive at least one dose Decitabine every week. If decided by treating physician that the patient needs a more rapid debulking of high disease burden, a second dose can be added. If Decitabine is given twice a week, should preferably be given on two consecutive days. Venetoclax is dosed at 400 mg by mouth one day a week a day prior to the first decitabine dose. If patients are taking another CYP3A4 inhibitor dose adjustments should be made as recommended by pharmacist for a goal dose of venetoclax of 400 mg. If patient receives two days of decitabine a week, they still only take venetoclax on the day prior to the first dose of decitabine.