Palbociclib and Sorafenib, Decitabine, or Dexamethasone in Treating Patients With Recurrent or Refractory Leukemia

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PRIMARY OBJECTIVES: I. To determine the maximum tolerated dose (MTD) and dose limiting toxicities (DLT) of various combinations with palbociclib in patients with relapsed and refractory leukemias. SECONDARY OBJECTIVES: I. To assess pharmacodynamic effects of palbociclib on the Cyclin-CDK-Rb axis in ...

PRIMARY OBJECTIVES: I. To determine the maximum tolerated dose (MTD) and dose limiting toxicities (DLT) of various combinations with palbociclib in patients with relapsed and refractory leukemias. SECONDARY OBJECTIVES: I. To assess pharmacodynamic effects of palbociclib on the Cyclin-CDK-Rb axis in leukemic blasts of patients with relapsed/refractory (R/R) leukemias. II. To explore the efficacy (complete response [CR], complete remission without platelet recovery [CRp], complete remission without blood count recovery [CRi], partial response [PR], or clinical benefit [CB]) of palbociclib as a single-agent and in combinations in patients with R/R leukemias. III. To explore biomarkers of response and resistance in patients with R/R leukemias treated with palbociclib. IV. To assess the safety and tolerability of one cycle of single-agent palbociclib in patients with R/R leukemias. OUTLINE: This is a dose-escalation study of sorafenib, decitabine, and dexamethasone. Patients are assigned to 1 of 3 arms. ARM I: Patients receive palbociclib orally (PO) once daily (QD) on days 1-28. Patients also receive sorafenib PO QD on days 1-28 beginning on cycle 2. Treatment repeats every 28 days for up to 8 cycles in the absence of disease progression or unacceptable toxicity. ARM II: Patients receive palbociclib as in Arm I. Beginning cycle 2, patients receive palbociclib PO QC on days 1-7 and decitabine intravenously (IV) QD over 1 hour on days 8-17 of cycle 2 and days 8-12 of cycles 3-8. Treatment repeats every 28 days for up to 8 cycles in the absence of disease progression or unacceptable toxicity. ARM III: Patients receive palbociclib as in Arm I. Patients also receive dexamethasone PO QD or IV over 15-30 minutes on days 1-4 and 15-18 beginning on cycle 2. Treatment repeats every 28 days for up to 8 cycles in the absence of disease progression or unacceptable toxicity. After completion of study treatment, patients are followed up periodically.

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