BLockade of PD-1 Added to Standard Therapy to Target Measurable Residual Disease in Acute Myeloid Leukemia 1 (BLAST MRD AML-1): A Randomized Phase 2 Study of the Anti-PD-1 Antibody Pembrolizumab in Combination With Conventional Intensive Chemotherapy as Frontline Therapy in Patients With Acute Myeloid Leukemia

简要总结

详细描述

PRIMARY OBJECTIVE: I. To assess the percentage of patients with minimal residual disease (MRD) negative complete remission (CR) (MRD-CR), or with minimal residual disease (MRD) negative complete remission with incomplete recovery (CRi) (MRD-CRi) as measured by flow cytometry at the end of first cycle of consolidation therapy with chemotherapy + pembrolizumab (MK-3475) and compare between the two study arms. SECONDARY OBJECTIVES: I. Assess the rate of complete remission (CR)/complete remission with incomplete count recovery (CRi) as defined per European Leukemia Net 2017 response criteria at time of count recovery after induction therapy with chemotherapy + pembrolizumab (MK-3475) (Dohner et al., 2017). II. Rates of complete remission with partial recovery count (CRh) and hematologic improvement (HI) to red blood cells and platelets. III. Assess the rates of MRD negativity at day 14, MRD-negative CR at end of induction therapy and MRD negative CR after last consolidation cycle. IV. Assess event free survival (EFS), measured from randomization to failure to achieve CR/CRi, relapse or death from any cause, and relapse free survival (RFS), calculated as the time from first documentation of CR/CRi to either disease relapse or death from any cause. V. Assess the duration of response (DOR, defined as the time from first CR/CRi to the date of the first documented relapse or death, whichever occurs first) and overall survival (OS), defined as time from randomization to death from any cause. VI. Assess safety endpoints including proportion of patients who develop severe toxicity as defined in the protocol. EXPLORATORY OBJECTIVES: I. MRD assessment by duplex sequencing (DS) and comparing DS and multiparameter flow cytometry for MRD detection as an exploratory biomarker. II. Assessment of immune-checkpoint expression and dynamic change of immune cell subsets in response to the combination of checkpoint-inhibition and backbone combination in acute myeloid leukemia (AML). III. High-throughput sequencing of the T-cell receptor (TCR) Vb CDR3 regions on flow cytometrically sorted t-cell subsets to assess the effect of immunotherapy on the diversity of the t-cell repertoire and assess for correlation to clinical outcomes. IV. Investigation of protein signatures and ribonucleic acid (RNA) signatures associated with response and efficacy using O-link cytokine panel and RNA-sequencing (seq), respectively. V. Determination of mutational load by whole exome sequencing to assess for correlation with clinical outcomes, immune infiltrating profile, and T cell repertoire diversity and clonality. VI. Correlate gut microbiome at baseline and changes in the microbiome with clinical response, both in standard chemotherapy and immunotherapy/chemotherapy therapy settings. VII. MRD assessment using duplex sequencing strategy for circulating cell-free tumor deoxyribonucleic acid (DNA) and correlation with long-term outcomes. OUTLINE: Patients are randomized to 1 of 2 arms. INDUCTION PHASE: ARM I: Patients receive cytarabine via continuous intravenous (IV) infusion on days 1-7 and idarubicin hydrochloride IV over 15-30 minutes or daunorubicin hydrochloride IV over 15-30 minutes on days 1-3 of a 28-35 day cycle. Patients who have evidence of residual leukemia receive cytarabine via continuous IV infusion over days 1-5 and idarubicin hydrochloride IV over 15-30 minutes or daunorubicin hydrochloride IV over 15-30 minutes on days 1-2 for an additional cycle in the absence of disease progression or unacceptable toxicity. Beginning day 8, patients receive pembrolizumab IV over 25-40 minutes. Cycles repeat every 3 weeks in the absence of disease progression or unacceptable toxicity. Patients who achieve a CR or a CRi may undergo hematopoietic stem cell transplantation (HSCT) per physician discretion or continue to consolidation therapy. ARM II: Patients receive cytarabine via continuous IV infusion on days 1-7 and idarubicin hydrochloride IV over 15-30 minutes or daunorubicin hydrochloride IV over 15-30 minutes on days 1-3 of a 28-35 day cycle. Patients who have evidence of residual leukemia receive cytarabine via continuous IV infusion over days 1-5 and idarubicin hydrochloride IV over 15-30 minutes or daunorubicin hydrochloride IV over 15-30 minutes on days 1-2 for an additional cycle in the absence of disease progression or unacceptable toxicity. Patients who achieve a CR or a CRi may undergo HSCT per physician discretion or continue to consolidation therapy. CONSOLIDATION THERAPY: ARM I: Within 4 weeks of remission status documentation, patients receive high-dose cytarabine (HiDAC) IV over 1-3 hours every 10-12 hours on days 1, 3, and 5 for a total of 6 doses and pembrolizumab IV over 25-40 minutes. Cycles with HiDAC repeat every 28-42 days and cycles with pembrolizumab repeat every 3 weeks in the absence of disease progression or unacceptable toxicity. Patients who remain in CR or CRi receive up to 3 additional cycles of HiDAC and pembrolizumab in the absence of disease progression or unacceptable toxicity and continue to maintenance therapy. ARM II: Within 4 weeks of remission status documentation, patients receive HiDAC IV over 1-3 hours every 12 hours on days 1, 3, and 5 for a total of 6 doses in the absence of disease progression or unacceptable toxicity. Patients who remain in CR or CRi receive up to 3 additional cycles of HiDAC in the absence of disease progression or unacceptable toxicity. MAINTENANCE THERAPY: ARM I: Patients receive pembrolizumab IV over 25-40 minutes. Cycles repeat every 3 weeks for up to 2 years in the absence of disease progression or unacceptable toxicity. All patients also undergo a skin punch biopsy during screening and undergo bone marrow biopsy and aspiration, collection of blood samples, and echocardiography (ECHO) or multigated acquisition scan (MUGA) during screening and on study. Patients may optionally undergo computed tomography (CT) scan during screening. After completion of study treatment, patients are followed up at 30 days and then every 6 months for up to 5 years. Patients who undergo HSCT are also followed up at 100 days post-transplant.

主要结局

次要结局

• Rate of CR/CRi(33 days (mean) post induction)
• MRD Negativity(At day 14)
• Percentage of Patients With MRD-CR Using a MRD Cutoff of 0.01%(33 days (mean))
• Event-free Survival(From randomization to failure to achieve CR/CRi, relapse or death from any cause, 157 days (mean))
• Relapse-free Survival (RFS)(From first documentation of CR/CRi to either disease relapse or death from any cause, 33 days (mean))
• Duration of Response (DOR)(From first CR to the date of the first documented relapse or death, whichever occurs first, 244 days (mean))
• Incidence of Adverse Events(Up to 35 days from start of treatment)