Recurrent B-Cell Non-Hodgkin Lymphoma Clinical Trial
Official title:
Randomized Phase 2 Study With Safety Run-In of PD-1 Inhibitor and IgG4 SIRPĪ±-Fc Fusion Protein (TTI-622) and PD-1 Inhibitor and IgG1 SIRPĪ±-Fc Fusion Protein (TTI-621) in Relapsed Diffuse Large B-Cell Lymphoma (DLBCL)
This phase II trial tests the safety, side effects, and best dose of TTI-621 or TTI-622 in combination with pembrolizumab in treating patients with diffuse large B-Cell lymphoma that has come back (relapsed). TTI-621 and TTI-622 are called fusion proteins. A fusion protein includes two specialized proteins that are joined together. In TTI-621 and TTI-622, one of the proteins binds with other proteins found on the surface of certain cells that are part of the immune system. The other protein targets and blocks a protein called CD47. CD47 is present on cancer cells and is used by those cells to hide from the body's immune system. By blocking CD47, TTI-621 and TTI-622 may help the immune system find and destroy cancer cells. Pembrolizumab is a monoclonal antibody directed against human cell surface receptor PD-1 (programmed death-1 or programmed cell death-1) that works by helping the body's immune system attack the cancer and may interfere with the ability of cancer cells to grow and spread. Giving TTI-621 or TTI-622 in combination with pembrolizumab may kill more cancer cells in patients with relapsed or refractory diffuse large B-cell lymphoma.
PRIMARY OBJECTIVES: I. To determine the toxicities of ontorpacept (TTI-621) or SIRPa-IgG4-Fc Fusion Protein TTI-622 (TTI-622) combined with pembrolizumab and to identify the recommended Phase 2 dose (RP2D) of TTI-621 and TTI-622, each combined with pembrolizumab. (Safety run in) II. To estimate preliminary efficacy of pembrolizumab in combination with TTI-621 (Arm A) or TTI-622 (Arm B) as measured by overall response rate (ORR). (Phase II). SECONDARY OBJECTIVE: I. To estimate efficacy of pembrolizumab in combination with TTI-621 or TTI-622 as measured by duration of response (DOR), progression free survival (PFS), and overall survival (OS). CORRELATIVE OBJECTIVE: I. Correlation of biomarkers measured in serial peripheral blood samples and tumor tissues with clinical responses, which may include but are not limited to: SIRPalpha expression, monocyte/macrophage markers in tumor micro-environment, tumor infiltrating lymphocytes (TILs), PD-1/PDL-1 expression. OUTLINE: Patients are assigned to 1 of 2 arms. ARM A: Patients receive pembrolizumab intravenously (IV) over 30 minutes on day 1 of each cycle and TTI-621 IV over 60-120 minutes on day 1 of each cycle. Treatment repeats every 21 days for up to 12 cycles in the absence of disease progression or unacceptable toxicity. Patients also undergo positron emission tomography/computed tomography (PET/CT) scans or CT scans of the chest, abdomen, and pelvis prior to cycle 3 and every 4 cycles thereafter. If no disease progression after cycle 12, patients then receive pembrolizumab IV over 30 minutes on days 1 of each cycle and TTI-621 IV over 60-120 minutes on day 1 of each cycle. Treatment repeats every 21 days for up to 23 cycles in the absence of disease progression or unacceptable toxicity. ARM B: Patients receive pembrolizumab IV over 30 minutes on day 1 of each cycle and TTI-622 IV over 60-90 minutes on day 1 of each cycle. Treatment repeats every 21 days for up to 12 cycles in the absence of disease progression or unacceptable toxicity. Patients also undergo PET/CT scans or CT scans of the chest, abdomen, and pelvis prior to cycle 3 and every 4 cycles thereafter. If no disease progression after cycle 12, patients then receive pembrolizumab IV over 30 minutes on days 1 of each cycle and TTI-622 IV over 60-90 minutes on day 1 of each cycle. Treatment repeats every 21 days for up to 23 cycles in the absence of disease progression or unacceptable toxicity. After completion of the study treatment, patients are followed every 6 months for up to 2 years from registration. ;
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