Journal Article
. 2019 Sep; 25(23):7004-7013.
doi: 10.1158/1078-0432.CCR-19-0438.

A Phase I Study of the Combination of Rituximab and Ipilimumab in Patients with Relapsed/Refractory B-Cell Lymphoma

Joseph M Tuscano 1 Emanual Maverakis 2 Susan Groshen 3 Denice Tsao-Wei 3 Guillaume Luxardi 2 Alexander A Merleev 2 Anne Beaven 4 John F DiPersio 5 Leslie Popplewell 6 Robert Chen 6 Mark Kirschbaum 7 Mark A Schroeder 5 Edward M Newman 8 
Affiliations
  • PMID: 31481504
  •     24 References
  •     12 citations

Abstract

Purpose: Based on the potential for ipilimumab (I) to augment T-cell activation, we hypothesize that ipilimumab would augment the efficacy of rituximab (R) in patients with relapsed/refractory (R/R) CD20+non-Hodgkin's lymphoma (NHL). This phase I study aimed to identify a recommended phase 2 dose, document toxicities, and preliminarily assess efficacy and potential predictive biomarkers.

Patients And Methods: Thirty-three patients with R/R CD20+B-cell lymphoma received R at 375 mg/m2weekly for 4 weeks and I at 3 mg/kg on day 1 and every 3 weeks for four doses. Responding patients went on to maintenance with each agent given every 12 weeks. To facilitate correlative analysis, the expansion phase randomized patients to simultaneous R+I versus R with I delayed 2 weeks.

Results: Toxicity was manageable; no dose-limiting toxicity was observed at the doses studied. When considering the entire cohort, efficacy was modest, with an objective response rate (ORR) of 24% and median progression-free survival (PFS) of 2.6 months. However, in follicular lymphoma patients, the ORR was 58% with a median PFS of 5.6 months. The randomized comparison of R with R+I demonstrated that R+I resulted in more effective B-cell depletion (BCD). Both B-cell depletion and the ratio of CD45RA-regulatory T cell (Treg) to Treg were associated with response at all time points.

Conclusions: The combination of R+I has manageable toxicity and encouraging efficacy in R/R follicular lymphoma. The ratio of CD45RA-Tregs to total Tregs, and peripheral BCD should be studied further as potential predictors of response.

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