Camrelizumab for relapsed or refractory classical Hodgkin lymphoma: extended follow-up of the multicenter, single-arm, phase 2 study.

Abstract

Camrelizumab (a humanized high-affinity IgG4 mAb against PD-1) showed potent antitumor activity, well tolerance, and controllable safety in patients with relapsed or refractory classical Hodgkin lymphoma (r/r cHL), based on the primary analysis of a phase 2 study. Here, we present the extended follow-up outcomes. Seventy-five patients who had failed to achieve a remission or experienced progression after autologous stem cell transplantation or had received at least two lines of systemic chemotherapies were enrolled to receive camrelizumab 200\xa0mg every 2\u2009weeks. With a median follow-up of 36.2\xa0months (range, 7.2-38.1), objective response rate per independent central review was 76.0% (95% CI, 64.7-85.1). Among the 57 responders, 31 (54.4%) had ongoing responses. Median duration of response was 31.7\xa0months (95% CI, 16.7-not reached). Median progression-free survival was 22.5\xa0months (95% CI, 14.7-not reached). 36-month overall survival rate was 82.7% (95% CI, 72.0-89.5). Reactive capillary endothelial proliferation (RCEP) occurred in 97.3% of patients (73/75), but all RCEP were grade 1 or 2 in severity and 67.1% of these patients (49/73) achieved complete resolution. Occurrence of new RCEP lesions was rare (8/42 [19.0%] at 12\xa0months; 2/32 [6.3%] at 24\xa0months). No treatment-related deaths occurred, and no new toxicities were reported. With extended follow-up, camrelizumab monotherapy continues to provide a robust and durable response, long survival, and manageable safety in r/r cHL patients. This article is protected by copyright. All rights reserved.