Durable responses in patients with genitourinary cancers following immune checkpoint therapy rechallenge after moderate-to-severe immune-related adverse events

• Published in: Journal for immunotherapy of cancer Vol. 9; no. 7; p. e002850
• Main Authors: Siddiqui, Bilal A, Gheeya, Jinesh S, Goswamy, Rohit, Bathala, Tharakeswara K, Surasi, Devaki Shilpa, Gao, Jianjun, Shah, Amishi, Campbell, Matthew T, Msaouel, Pavlos, Goswami, Sangeeta, Wang, Jennifer, Zurita, Amado J, Jonasch, Eric, Corn, Paul G, Aparicio, Ana M, Siefker-Radtke, Arlene O, Sharma, Padmanee, Subudhi, Sumit K, Tannir, Nizar
• Format: Journal Article
• Language: English
• Published: England BMJ Publishing Group Ltd 01.07.2021; BMJ Publishing Group LTD; BMJ Publishing Group
• Series: Original research
• Subjects: Adult; Aged; Aged, 80 and over; Apoptosis; autoimmunity; Bladder cancer; Cancer; Clinical/Translational Cancer Immunotherapy; Cohort Studies; Cytotoxicity; Disease; Drug-Related Side Effects and Adverse Reactions - etiology; Female; Hepatitis; Humans; Immune Checkpoint Inhibitors - adverse effects; Immune Checkpoint Inhibitors - pharmacology; immunotherapy; Immunotherapy - methods; Inflammatory bowel disease; Kidney cancer; kidney neoplasms; Ligands; Male; Medical records; Metastasis; Middle Aged; Patients; Prostate cancer; prostatic neoplasms; Proteins; Pruritus; Retrospective Studies; Steroids; urinary bladder neoplasms; Urogenital Neoplasms - drug therapy; urinary bladder neoplasms; kidney neoplasms; autoimmunity; immunotherapy; prostatic neoplasms
• ISSN: 2051-1426; 2051-1426
• DOI: 10.1136/jitc-2021-002850

BackgroundImmune checkpoint therapy (ICT) prolongs survival in subsets of patients with cancer but can also trigger immune-related adverse events (irAEs) requiring treatment discontinuation. Recent studies have investigated safety of ICT rechallenge after irAEs, and evidence suggests that rechallenge may be associated with improved antitumor responses. However, data are limited on response duration after ICT rechallenge, particularly after severe irAEs.ObjectiveTo evaluate safety and efficacy of ICT rechallenge after moderate-to-severe irAEs in patients with renal cell carcinoma (RCC), urothelial carcinoma (UC), and prostate cancer.MethodsIn this retrospective cohort study, medical records from September 25, 2013, to June 1, 2020, for patients with genitourinary (GU) cancers at MD Anderson Cancer Center who were rechallenged with the same or different ICT following irAEs were reviewed. Demographics, ICT exposure, irAEs (grade and treatment), ICT discontinuation or rechallenge, rates of subsequent irAEs (new or recurrent) and antitumor activity (objective response rates and response duration) were reviewed.ResultsSixty-one patients with RCC, UC, and prostate cancer were rechallenged with ICT after experiencing 105 total irAEs. Objective response rates after rechallenge, that is, upgrade in response, were 14% in RCC (4/28), 21% in UC (3/14), and 0% in prostate cancer. All seven patients who achieved upgrade in response had initial grade 2 or 3 irAEs. Responses were durable among these seven patients, with median radiographic progression-free survival not reached (range: 3.7–66.4 months) as of the March 8, 2021, data cut-off (median follow-up 40.9 months (95% CI 35.3 to 46.5)). All achieved complete response except one patient who was lost to follow-up. The rate of subsequent grade 3 or 4 irAEs after rechallenge was 30%, with no fatal irAEs. The rate of recrudescence of the same irAE was 26% (16/61). 54% of patients received corticosteroids (33/61), and 21% received targeted immunosuppression (13/61) for the initial irAEs.Conclusions and relevanceICT rechallenge after moderate-to-severe irAEs was associated with deep and durable responses in a subset of patients with RCC and UC, with acceptable safety and no fatal events. Strategies to enable ICT resumption after moderate-to-severe irAEs, such targeted immunosuppression, warrant further study.