Immune Checkpoint Inhibitor Use Near the End of Life: A Single-Center Retrospective Study

Abstract

Background: Immune checkpoint inhibitors (ICIs) have revolutionized treatment for many patients with advanced cancer. Little is known about ICI use near the end of life. Objective: To describe ICI use near the end of life. Design: Retrospective study of patients who received ICIs and died. Setting/Subjects: Patients treated with ICIs who died between August 2014 and December 2018 (N = 441) at the University of Iowa. Measurements: Comparisons were made between patients who received ICIs ≤30 days versus patients who received ICIs >30 days before death. The same analysis was done using a cutoff of 90 days. Results: Two hundred ninety-four (67%) patients received ICIs in the last 90 days of life and 117 (27%) patients received ICIs in the last 30 days of life. Patients who received ICIs in the last 30 days of life received fewer mean doses and more often ≤3 total doses. They also had higher mean Eastern Cooperative Oncology Group (ECOG) scores, more patients with ECOG ≥3, higher rates of dying in the hospital, and lower hospice enrollment. Patients treated with ICIs in the last 90 days of life received fewer doses, more often ≤3 total doses, had a higher mean ECOG score, more patients with ECOG ≥3, and lower hospice enrollment. $7.1 million USD was spent on ICI medications in the last 90 days of life. Conclusion: ICI use near the end of life is associated with poor performance status, lower hospice enrollment, dying in the hospital, financial toxicity, and minimal clinical benefit.

Keywords: cancer; end of life; immune checkpoint inhibitor; immunotherapy; oncology.