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Clinical Trial Summary

This study evaluates the addition of Atezolizumab to current therapy of Rituximab, Gemcitabine and Oxaliplatin (R-GemOx) for patients with relapsed or refractory Diffuse Large B-Cell Lymphoma (DLBCL) that are not candidates for high-dose therapy. All patients will receive one cycle of R-GemOx. Three quarters of patients (Arm B) will go on to have a further 5 cycles (every 14 days) of R-GemOx with Atezolizumab, with one quarter of patients (Arm A) continuing with 5 cycles of R-GemOx. The patients in Arm B will continue to have Atezolizumab every 21 days for 8 cycles whilst Arm A patients will enter an observational phase during this time. Follow up will begin at 12 months from initial treatment until month 32.


Clinical Trial Description

Rituximab is a chimeric mouse/human monoclonal antibody that binds to CD20, on pre-B and mature B lymphocytes and eliminates these cells potentially via a number of different mechanisms. The R-GemOx regimen has been adopted by many sites internationally as therapy for older patients or comorbid patients with relapsed or refractory DLBCL and as a back-bone for the investigation of novel therapies in combination with chemotherapy. The cytotoxic T-lymphocyte co-receptor PD-1 has been extensively studied and is recognised to provide critical inhibitory signals that down-regulate T-cell function and provides a mechanism for immune evasion for tumours. PD-L1, the ligand of PD-1 is expressed on DLBCL tumour cells, along with infiltrating non-malignant cells, primarily macrophages, with PD-1 expressed on tumour infiltrating lymphocytes (TILs). Atezolizumab targets programmed PD-L1 on immune and tumour cells and prevents interaction with either PD-1 receptor or B7.1 (CD80), both of which function as inhibitory receptors expressed on T cells. Interference of the PD-L1:PD-1 and PDL1:B7.1 interactions may enhance the magnitude and quality of the tumour-specific T-cell response through increased T-cell priming, expansion, and/or effector function. This study of atezolizumab in combination with rituximab, gemcitabine and oxaliplatin aims to address the unmet need of patients with relapsed and refractory DLBCL. It is based upon a sound mechanistic approach, investigating the activity of novel agents and will aim to compressively explore biomarkers of response. The primary objective will be to document the durability of anti-tumour activity in patients with relapsed or refractory DLBCL and to determine the safety and toxicity profile of the combination. A maintenance phase of atezolizumab has been added as this may induce an on-going T-cell response to neo-antigens released as a result of chemotherapy. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT03422523
Study type Interventional
Source University Hospital Southampton NHS Foundation Trust
Contact
Status Terminated
Phase Phase 2
Start date May 9, 2018
Completion date November 18, 2021

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