RecruitingInterventionalPhase 1

A Two-Part Phase 1b Study Evaluating the Combination of Tazemetostat and CPX-351 (Part 1) and Palbociclib Pre-Treatment Followed by CPX-351 (Part 2) for the Treatment of Relapsed or Refractory Acute Myeloid Leukemia

NCT ID: NCT05627232Sponsor: Thomas Jefferson UniversityLast updated: 2026-03-12

Summary

This is a two-part phase Ib dose escalation study to evaluate the safety and preliminary efficacy of the combination of tazemetostat and CPX-351 (Part 1) and of pre-treatment with palbociclib followed by CPX-351 (Part 2) for patients with relapsed or refractory (R/R) acute myeloid leukemia (AML). Part 1 of the study will seek to establish the safety, tolerability, biological activity and recommended dose for further evaluation (RDFE) of tazemetostat in combination with standard-dose CPX-351. Part 2 of the study will seek to establish the safety, tolerability, biological activity RDFE of pre-treatment palbociclib prior CPX-351.

Detailed description

PRIMARY OBJECTIVE: Part 1: To determine the RDFE of tazemetostat in combination with CPX-351 in patients with R/R-AML. Part 2: To determine the RDFE of palbociclib pre-treatment prior to CPX-351 in patients with R/R-AML. SECONDARY OBJECTIVE: I. To evaluate the preliminary efficacy of tazemetostat in combination with CPX-351 (Part 1) and of palbociclib pre-treatment followed by CPX-351 (Part 2). EXPLORATORY OBJECTIVES: 1. To determine whether treatment with the EZH2 inhibitor tazemetostat de-condenses the H3K27me3-marked chromatin of AML blasts. 2. To determine whether cell cycle re-entry of AML cells after palbociclib treatment influences DNA damage and apoptosis induced by combining EZH2 inhibition with anthracycline-based therapy This is a phase 1b, single-institution, two-part, dose-escalation study utilizing tazemetostat in combination with CPX-351 (Part 1) and palbociclib pre-treatment followed by CPX-351 (Part 2) for patients with R/R-AML who are fit to receive intensive chemotherapy. The study will take place in two parts: Part 1: Dose escalation via traditional 3+3 design of tazemetostat in combination with CPX-351 . Part 2: Dose escalation via traditional 3+3 design of palbociclib pre-treatment followed by tazemetostat/CPX-351combination. Once the RDFE of tazemetostat in combination with CPX-351 and the RDFE of palbociclib pre-treatment followed by CPX-351 have been determined, we hope to pursue further evaluation of the safety and preliminary efficacy of the three-drug combination pending further protocol amendment.. After completion of study treatment, patients are followed up at 3 months, 6 months, and 1 year for clinical outcomes including survival.

Arms & interventions

DrugTazemetostat
Given PO
DrugLiposome-encapsulated Daunorubicin-Cytarabine
Given IV
ProcedureBone Marrow Aspiration and Biopsy
Undergo bone marrow aspiration and biopsy
ProcedureBiospecimen Collection
Undergo blood sample collection
DrugPalbociclib
Given PO

Outcome measures

Primary

Incidence of grade >= 3 non-hematologic dose limiting toxicities
The primary outcome measure will be grade \>= 3 non-hematologic dose limiting toxicities. Adverse events will be coded by organ system and graded according to the Common Terminology Criteria for Adverse Events (CTCAE) version (v.) 5.0. the calculation of adverse events incidences will be passed on number of patients per adverse event category. Standard proportions will be used to report rates of safety endpoints. Summary tables will be presented by dose level, seriousness, severity and relatedness.
Time frame: Up to 1 year

Secondary

Incidence of adverse events
Time frame: Up to 1 year
Complete response
Time frame: Up to 1 year
Partial remission (PR)
Time frame: Up to 1 year
Relapse
Time frame: Up to 1 year
Induction failure/refractory acute myeloid leukemia (AML)
Time frame: Up to 1 year
Time to blood count recovery
Time frame: The number of days until ANC > 1.0 x 10^9/L and platelets >= 100 x 10^9/L from day 1 of treatment, assessed up to 1 year
Relapse free survival
Time frame: The time measured in months to relapse from day 1 of treatment, assessed up to 1 year
Overall survival
Time frame: The time measured in months from day 1 of treatment, assessed up to 1 year
Rate of allogeneic stem cell transplantation
Time frame: Up to 1 year
Time to transplant
Time frame: The time measured in months to allogeneic stem cell transplantation from day 1 of treatment, assessed up to 1 year

Eligibility criteria

Sex: AllAge: 18 Years and olderHealthy volunteers: No

Inclusion Criteria: * Provide signed and dated informed consent form * Willing to comply with all study procedures and be available for the duration of the study * Male or female \>= 18 years of age * Histologically confirmed acute myeloid leukemia (non-M3) relapsed from or refractory to at least 1 prior line of therapy. Bone marrow aspirate and biopsy within 28 days of screening is acceptable. If no prior bone marrow biopsy is available, bone marrow biopsy must be performed during screening unless: \* If the subject has \>= 20% myeloblasts present in the peripheral blood, a bone marrow biopsy is not necessary to meet this criterion * Treatment with a prior investigational agent is acceptable so long as it has not been administered within 2 weeks of enrollment and any prior adverse effects have resolved to grade 1 or less with the exception of alopecia * Eastern Cooperative Oncology Group (ECOG) performance status of 2 or less * Life expectancy of at least 4 weeks * Must be able to consume oral medication * Subjects must have recovered from the toxic effect of any prior therapy to =\< grade 1 (except alopecia) * Creatine clearance (CrCL) \>= 45 * Total bilirubin \< 2 x upper limit of normal (ULN) * Female subjects of childbearing age must have a negative pregnancy test Exclusion Criteria: * Subjects with acute promyelocytic leukemia * Subjects receiving any active chemotherapy agents (except hydroxyurea). Intrathecal methotrexate and cytarabine are permissible * Subjects whose participation would result in a total cumulative dose of daunorubicin greater than 550 mg/m\^2 or greater than 450 mg/m\^2 if they previously received mediastinal radiation * Subjects with evidence of active central nervous system (CNS) leukemia involvement. Lumbar puncture is not required for enrollment in the absence of neurologic symptoms * Subjects must not be receiving growth factors (except erythropoietin) * Subjects with currently active second malignancy with the exception of nonmelanoma skin cancer, carcinoma in situ of the cervix, resected prostate cancer with Gleason score =\< 6 * Subjects with unstable cardiac disease or uncontrolled arrhythmia * Subjects with other severe concurrent disease which, in the judgement of the investigator, would make the patient inappropriate to receive high-intensity therapy * Subjects who are pregnant or breastfeeding * Subjects with known allergic reactions to components of the study product(s) * Anything that would place the individual at increased risk or preclude the individual's full compliance with or completion of the study

Study locations (1)

Thomas Jefferson University Hospital

Philadelphia, Pennsylvania, 19107

Recruiting

Gina Keiffer, MD · Contact

215-955-2929 gina.keiffer@jefferson.edu