Conditions: Relapsed Acute Leukemia Refractory Acute Leukemia High-Risk Myelodysplasia
Allocation: NON_RANDOMIZED | Intervention model: SINGLE_GROUP
Enrollment: 2
Healthy volunteers: no

Brief summary:
1.1 Primary Objectives

* To determine the feasibility, tolerability, and toxicities of administering the selective CDK 4/6 inhibitor PD 0332991 prior to the combination of ara-C and Mitoxantrone for adults with relapsed and refractory acute leukemias and high risk myelodysplasias (MDS), including primary refractory disease
* To determine the direct cytotoxic effects of single agent PD 0332991 on malignant blasts
* To determine the maximal tolerated dose (MTD) of PD 0332991 in timed sequential combination with ara-C and Mitoxantrone
* To determine if the timed sequential combination of PD 0332991 with ara-C and mitoxantrone can induce clinical responses in adults with relapsed or refractory acute leukemias and high-risk MDS

1.2 Secondary Objectives:

* To determine the ability of PD 0332991 to directly induce apoptosis in malignant cell populations in vivo
* To obtain pharmacodynamic (PD) data regarding the ability of PD 0332991 to arrest malignant cells in the G 1 phase of cell cycle, followed by synchronized release of those cells into S phase upon discontinuation of PD 0332991 and resultant enhanced ara-C cytotoxicity

Detailed description:

Arms:
arm 1: * PD 0332991 will be given orally days 1,2,3
* Cytarabine (ara-C) will be given by continuous 72 hour intravenous infusion beginning on day 6
* Mitoxantrone will be given over 2 hour infusion day 9, 12 hours after the completion of the ara-C infusion. The mitoxantrone dose may be reduced by 25-50% for patients who have received previous anthracyclines as determined by total previous anthracycline dose

Interventions: intervention 1: PD 0332991
Intervention descriptions: intervention 1: • PD 0332991 will be given orally days 1,2,3

Protocol document: