PLX51107 and Azacitidine in Treating Patients With Acute Myeloid Leukemia or Myelodysplastic Syndrome

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  • sponsor
    M.D. Anderson Cancer Center
Updated on 26 February 2022
myeloid leukemia
myeloproliferative disorder
ejection fraction
blast cells
colony stimulating factor
cytotoxic agents
myelodysplastic/myeloproliferative neoplasm
brd4 inhibitor plx51107


This phase I trial studies the side effects and best dose of PLX51107 and how well it works with azacitidine in treating patients with acute myeloid leukemia or myelodysplastic syndrome. PLX51107 may stop the growth of cancer cells by blocking some of the enzymes needed for cell growth. Drugs used in chemotherapy, such as azacitidine, work in different ways to stop the growth of cancer cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Giving PLX51107 and azacitidine may work better than azacitidine alone in treating patients with acute myeloid leukemia or myelodysplastic syndrome.



I. To determine the minimum safe and biologically-effective dose of the combination of PLX51107 and azacitidine (AZA).


I. To determine overall response rate (ORR) rate including CR (complete remission) + CRp (complete remission with incomplete platelet recovery) + CRi (complete remission with incomplete count recovery) + CRh (complete remission with partial hematologic recovery), partial remission (PR) within 3 months of treatment initiation of PLX51107 and AZA combination in patients with myelodysplastic syndrome (MDS) or acute myeloid leukemia (AML).

II. To investigate correlations of response to this combination with a pre-therapy, on-therapy, and progression 81-gene panel of gene mutations in AML.

III. To determine the duration of response (DOR), event-free survival (EFS), overall survival (OS), and number of patients bridged to stem cell transplant (SCT) and median duration to SCT from the initiation of the combination.

OUTLINE: This is a dose-escalation study of PLX51107.

Patients receive PLX51107 orally (PO) once daily (QD) on days 1-21 and azacitidine subcutaneously (SC) or intravenously (IV) over 15 minutes on days 8-14 and 22-28. Treatment repeats every 28 days for up to 12 cycles in the absence of disease progression or unacceptable toxicity.

After completion of study treatment, patients are followed up at 30 days, then every 6-12 months for 5 years.

Condition Acute Myeloid Leukemia, Myelodysplastic Syndrome, Myelodysplastic/Myeloproliferative Neoplasm, Myeloproliferative Neoplasm
Treatment Azacitidine, BRD4 Inhibitor PLX51107
Clinical Study IdentifierNCT04022785
SponsorM.D. Anderson Cancer Center
Last Modified on26 February 2022


Yes No Not Sure

Inclusion Criteria

Diagnosis of
AML (World Health Organization [WHO] classification definition of >= 20% blasts), or
MDS intermediate-2 score or with > 10% blasts, to include: MDS, myeloproliferative neoplasm (MPN) with 10% blasts or more, or MDS/MPN 10% blasts or more
Patients who have received at least one prior therapy for AML or for MDS will be eligible. Any prior therapy for AML or MDS will be counted as a prior salvage
In the absence of rapidly progressing disease, the interval from prior treatment to time of initiation of protocol therapy will be at least 2 weeks for cytotoxic agents or at least 5 half-lives for cytotoxic/non-cytotoxic agents. The half-life for the therapy in question will be based on published pharmacokinetic literature (abstracts, manuscripts, investigator brochures, or drug-administration manuals) and will be documented in the protocol eligibility document. The use of chemotherapeutic or anti-leukemic agents is not permitted during the study with the following exceptions
Intrathecal (IT) therapy for patients with controlled central nervous system (CNS) leukemia at the discretion of the principal investigator (PI). Controlled CNS leukemia is defined by the absence of active clinical signs of CNS disease and no evidence of CNS leukemia on the most recent 2 simultaneous cerebrospinal fluid (CSF) evaluations
Use of one dose of cytarabine (up to 2 g/m^2) or hydroxyurea for patients with rapidly proliferative disease is allowed before the start of study therapy and for the first four weeks on therapy. These medications will be recorded in the case-report form
Eastern Cooperative Oncology Group (ECOG) performance status 0-2
Measured or calculated creatinine clearance >= 60 mL/min (unless considered due to leukemia)
Total bilirubin < 1.8 mg/dL (unless increase is due to hemolysis, congenital disorder, or leukemia)
Transaminases (serum glutamate pyruvate transaminase [SGPT]) < 2.5 x upper limit of normal (ULN) (unless considered due to leukemia)
Potassium levels should be within institutional normal limits (unless considered due to leukemia)
Magnesium levels should be within institutional normal limits (unless considered due to leukemia)
Calcium (normalized for albumin) levels should be within institutional normal limits (unless considered due to leukemia)
Ability to take oral medication
Ability to understand and provide signed informed consent prior to any study-related procedures and to comply with all study requirements
Baseline left ventricular ejection fraction by echocardiogram (ECHO) or multigated acquisition scan (MUGA) >= 50%
Women of childbearing potential (WOCBP) must have a negative serum or urine pregnancy test within 7 days. Men must agree not to father a child and agree to use a condom if his partner is of child bearing potential
WOCBP must use appropriate method(s) of contraception. WOCBP should use an adequate method to avoid pregnancy until after the last dose of investigational drug. Women who are not of childbearing potential (i.e., who are postmenopausal or surgically sterile) as well as men with azoospermia do not require contraception

Exclusion Criteria

Patients with known significant impairment of gastrointestinal (GI) function or GI disease that may significantly alter the absorption of PLX51107
Patients with any other known concurrent severe and/or uncontrolled medical condition including but not limited to diabetes, cardiovascular disease including hypertension, renal disease, or active uncontrolled infection, which could compromise participation in the study. Patients on active antineoplastic or radiation therapy for a concurrent malignancy at the time of screening. Maintenance therapy, hormonal therapy, or steroid therapy for well-controlled malignancy is allowed
Patients with known positive human immunodeficiency virus (HIV), hepatitis B or C infection by serology, with the exception of those with an undetectable viral load within 3 months. (HIV testing and hepatitis B or C testing is not required prior to study entry). Subjects with serologic evidence of prior vaccination to hepatitis B virus (HBV) (i.e., hepatitis B virus surface antigen negative [HBs Ag-], and hepatitis B surface antibody positive [HBs+]) may participate
Patients with advanced malignant hepatic tumors
Patients with known hypersensitivity to AZA or mannitol
Women who are pregnant or are breast-feeding
Patients who receive strong CYP3A4 and CYP2C8 inhibitors or inducers or CYP3A4 substrate drugs with a narrow therapeutic range, taken within 14 days or 5 drug half-lives, whichever is longer, before start of study drug
Patients who have received anti-cancer therapy within 14 days (or 5 half-lives) with all toxicities resolved to grade 1 or less. No immune therapy or other biologic therapy (other monoclonal antibodies or antibody-drug conjugates [ADCs]) within 28 days of cycle 1 day 1
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