Inpatient utilization of immune checkpoint inhibitors and clinical outcomes

Abstract

Introduction Retrospective studies have suggested that patients with poor performance status treated with immune checkpoint inhibitors have shorter overall survival and poorer response rates. This study was undertaken to investigate the possible relationships between inpatient immune checkpoint inhibitor use and clinical outcomes. Methods This was a retrospective chart review of cancer patients who received an immune checkpoint inhibitor while hospitalized from 1 January 2016 to 30 December 2020. The primary outcome was 90-day mortality or admission to hospice rate. Secondary outcomes included overall survival, time to death or discharge to hospice, and descriptive summarization of patient characteristics. Results A total of 52 patients were analyzed. At 90 days, 68.2% of subjects were expired or admitted to hospice (95% CI: 54.7–81%). 90-day overall survival was 47.1%; median survival time was 81 days (95% CI: 28–242 days). The median time to death or hospice was 35 days (95% CI: 24–72 days). The time to death or hospice was shorter for immune checkpoint inhibitor-naive patients compared to those who received immune checkpoint inhibitors prior to admission (29 days, 95% CI: 12–43 days vs. 242 days, 95% CI: 36–1288 days, respectively; HR: 2.74, 95% CI: 1.2–6.25; p = 0.0121). No differences were found when comparing other baseline characteristics. Conclusion A majority of patients who received an immune checkpoint inhibitor while hospitalized were either discharged to hospice or expired by 90 days. An increased rate of death or discharge to hospice was observed for patients who were immune checkpoint inhibitor-naive prior to their admission.