This phase I trial tests the safety, side effects, and best dose of lintuzumab-Ac225 in combination with venetoclax and ASTX-727, and how well they work in treating patients with newly diagnosed acute myeloid leukemia (AML). Lintuzumab-Ac225 is a monoclonal antibody, called lintuzumab, linked to a radioactive agent called actinium Ac 225. Lintuzumab attaches to CD33 positive cancer cells in a targeted way and delivers actinium Ac 225 to kill them. Venetoclax is in a class of medications called B-cell lymphoma-2 (BCL-2) inhibitors. It may stop the growth of cancer cells by blocking Bcl-2, a protein needed for cancer cell survival. ASTX-727 is a combination of two drugs, cedazuridine and decitabine. Cedazuridine is in a class of medications called cytidine deaminase inhibitors. It prevents the breakdown of decitabine, making it more available in the body so that decitabine will have a greater effect. Decitabine is in a class of medications called hypomethylation agents. It works by helping the bone marrow produce normal blood cells and by killing abnormal cells in the bone marrow. Giving lintuzumab-Ac225 in combination with venetoclax and ASTX-727 may be safe and tolerable in treating patients with newly diagnosed AML and may improve the chance of going into remission and staying in remission for a longer period of time.
PRIMARY OBJECTIVE: I. To determine recommended phase 2 dose (RP2D) of actinium Ac 225 lintuzumab (lintuzumab-Ac225) when used in combination with venetoclax and decitabine and cedazuridine (ASTX-727). SECONDARY OBJECTIVES: I. To determine the maximum tolerated dose of lintuzumab-Ac225 when used in combination with venetoclax and ASTX-727. II. To describe the frequency and severity of adverse events of patients treated on study, including cytopenia and organ toxicity after second dose of lintuzumab-Ac225. III. To determine the rate and time to complete remission (CR), complete remission with incomplete hematologic recovery (Cri), and complete remission with partial hematologic recovery (CRh). IV. To determine the rate and time to achieve CR/Cri/CRh without minimal residual disease (MRD) by multiparameter flow cytometry (MFC). V. To determine the duration of remission, event-free and overall survival of patients. VI. To evaluate and compare the clinical activity and toxicity between two lintuzumab-Ac225 administration schedules. EXPLORATORY OBJECTIVES: I. To correlate CD33 expression on AML cells with response to lintuzumab-Ac225 in combination with venetoclax and ASTX-727. II. To evaluate CD33 isoforms as a variable for response to lintuzumab-Ac225 combination with venetoclax and ASTX-727. OUTLINE: This is a dose-escalation study of lintuzumab-Ac225 in combination with venetoclax and ASTX-727. During dose-escalation phase, patients are randomized to 1 of 2 schedules. SCHEDULE 1: INDUCTION: Patients receive lintuzumab-Ac225 intravenously (IV) over 30 minutes on day 8, venetoclax orally (PO) once daily (QD) on days 1-28 and ASTX-727 PO QD on days 1-5 of cycle 1. RE-INDUCTION: Patients with CR, partial response (PR) or no response (NR) after cycle 1 receive lintuzumab-Ac225 IV over 30 minutes on day 8, venetoclax PO QD on days 1-28 and ASTX-727 PO QD on days 1-5 of cycle 2. MAINTENANCE/CONSOLIDATION: Patients with CRi, CRh, or morphologic leukemia-free state (MLFS) after cycle 1 receive venetoclax PO QD on days 1-28 and ASTX-727 PO QD on days 1-5 of each cycle. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity. Additionally, patients undergo bone marrow aspiration and biopsy and blood sample collection throughout the study. SCHEDULE 2: INDUCTION: Patients receive lintuzumab-Ac225 V over 30 minutes on day 1, venetoclax PO QD on days 1-28 and ASTX-727 PO QD on days 1-5 of cycle 1. RE-INDUCTION: Patients with CR, PR or NR receive lintuzumab-Ac225 IV over 30 minutes on day 1, venetoclax PO QD on days 1-28 and ASTX-727 PO QD on days 1-5 of cycle 2. MAINTENANCE/CONSOLIDATION: Patients with CRi, CRh, or MLFS after cycle 1 receive venetoclax PO QD on days 1-28 and ASTX-727 PO QD on days 1-5 of each cycle. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity. Additionally, patients undergo bone marrow aspiration and biopsy and blood sample collection throughout the study. After completion of study treatment, patients are followed up every 3 months for up to 5 years.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
53
Given IV
Undergo blood sample collection
Undergo bone marrow aspiration and biopsy
Undergo bone marrow aspiration and biopsy
Given PO
Given PO
Yale University Cancer Center LAO
New Haven, Connecticut, United States
Incidence of dose limiting toxicities
Adverse events (AEs) will be described and graded using Common Terminology Criteria for Adverse Events (CTCAE) version (v) 5.0.
Time frame: Up to 28 days after the start of induction (up to 42 days for persistent neutropenia and thrombocytopenia)
Overall response rate (ORR)
Will include patients with complete remission (CR), complete remission with partial hematologic recovery (CRh), and complete remission with incomplete hematologic recovery (CRi). ORR and its 95% confidence interval will be calculated.
Time frame: Up to 5 years
Maximum tolerated dose of lintuzumab Ac-225 when used in combination with venetoclax and ASTX-727
Will be determined based on the totality of safety (specifically cytopenia), tolerability, clinical activity, as appropriate.
Time frame: Up to completion of dose-escalation phase (Part A)
Frequency and severity of AEs
Will be assessed using CTCAE v 5.0. Toxicity by severity will be summarized using descriptive statistics. Will be listed for each dose level and the tabulations of AEs will also be produced by severity and by relationship to the study drug.
Time frame: Up to 30 days after last dose of study treatment
CR rate
Will be evaluated per European Leukemia Network (ELN) 2022 response criteria. Will be defined as bone marrow blasts \< 5%, absence of circulating blasts, absence of extramedullary disease, absolute neutrophil count (ANC) ≥ 1.0 x 10\^9/L (1,000uL), and platelet count ≥ 100 x 10\^9/L (100 000/uL).
Time frame: Up to 5 years
Time to CR
Will be evaluated per ELN 2022 response criteria.
Time frame: Up to 5 years
CRh rate
Will be evaluated per ELN 2022 response criteria. Will be defined as ANC ≥ 0.5 x 10\^9/L (500/uL) and platelet count ≥ 50 x 10\^9/L (50 000/uL), otherwise all other CR criteria met.
Time frame: Up to 5 years
Time to CRh
Will be evaluated per ELN 2022 response criteria.
Time frame: Up to 5 years
CRi rate
Will be evaluated per ELN 2022 response criteria. All CR criteria except for residual neutropenia \< 1.0 x 10\^9/L (1,000/uL) or thrombocytopenia \< 100 x 10\^9/L (100 000/uL).
Time frame: Up to 5 years
Time to CRi
All CR criteria except for residual neutropenia \< 1.0 × 109/L (1,000/µL) or thrombocytopenia \< 100 × 109/L (100 000/µL)
Time frame: Up to 5 years
CR rate without minimal residual disease (MRD)
Will be defined as CR with one or fewer residual leukemic blasts per 1,000 leukocytes as detected by multi-parameter flow cytometry (MFC). CR rate without MRD and its 95% confidence interval will be calculated.
Time frame: At end of induction and end of first and third consolidation cycles (cycle length = 28 days), assessed up to 5 years
CRh rate without MRD
Will be defined as CRh with one or fewer residual leukemic blasts per 1,000 leukocytes as detected by MFC. CRh rate without MRD and its 95% confidence interval will be calculated.
Time frame: At end of induction and end of first and third consolidation cycles (cycle length = 28 days), assessed up to 5 years
CRi rate without MRD
Will be defined as CRi with one or fewer residual leukemic blasts per 1,000 leukocytes as detected by MFC. CRi rate without MRD and its 95% confidence interval will be calculated.
Time frame: At end of induction and end of first and third consolidation cycles (cycle length = 28 days), assessed up to 5 years
Time to achieve CR without MRD
Evaluated using MFC. CR without MRD and its 95% confidence interval will be calculated.
Time frame: Up to 5 years
Time to achieve CRh without MRD
Evaluated using MFC. CRh without MRD and its 95% confidence interval will be calculated.
Time frame: Up to 5 years
Time to achieve CRi without MRD
Evaluated using MFC. CRi without MRD and its 95% confidence interval will be calculated.
Time frame: Up to 5 years
Duration of remission
Will be described using Kaplan-Meier product limit methods.
Time frame: From day of achieving CR, CRh, CRi to the date of hematological relapse or death from any cause, assessed up to 5 years
Progression free survival
Will be described using Kaplan-Meier product limit methods.
Time frame: Up to 5 years
Event-free survival
Will be described using Kaplan-Meier product limit methods.
Time frame: From day 1 of registration to the date of treatment failure, hematologic relapse from CR/CRh/CRi or death from any cause, whichever occurs first, assessed up to 5 years
Overall survival
Will be described using Kaplan-Meier product limit methods.
Time frame: From day 1 of registration to the date of death from any cause, assesesd up to 5 years
Clinical activity between two lintuzumab-Ac225 administration schedules
Clinical activity will be defined as a patient achieving CR/CRi/CRh/morphologic leukemia-free state or partial response.
Time frame: Up to 5 years
Toxicity between two lintuzumab-Ac225 administration schedules
Will be assessed on the frequency or severity of AEs.
Time frame: Up to 5 years
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