Performance status, survival, and end-of-life care in adults with non-small cell lung cancer (NSCLC) treated with immunotherapy.

Abstract

49 Background: Immune checkpoint inhibitors (ICI) improve survival for adults with metastatic NSCLC. Despite limited data on ICI efficacy in adults with poor performance status (PS), oncologists often elect to treat this population with ICI given their relatively favorable toxicity profile and potential for durable response. We aimed to describe the timing of ICI and patients’ survival based on PS, and explore the effect of late ICI use on end-of-life (EOL) care. Methods: Retrospective study of 235 adults with metastatic NSCLC at a single academic center who initiated ICI from 2015-2017. We compared overall survival (OS) among adults with Eastern Cooperative Oncology Group (ECOG) PS ≥ 2 at ICI start to those with ECOG PS < 2, using the log-rank test and Cox regression, adjusted for age, sex, comorbidity, time from diagnosis and line of therapy. We used logistic regression to analyze the association between ICI in the last 30 days of life and EOL care. Results: The median age at ICI start was 67 (range 37-91), and 83/235 (35%) had ECOG PS ≥ 2. Patients received ICI as first- (19%), second-line (56%) or later (25%) therapy. Median OS was 4.0 months in adults with ECOG PS ≥ 2 and 14.3 months in ECOG PS < 2 (p < 0.0001; HR = 2.5 [95% CI 1.8–3.5]). Among adults who died (n = 165), 17% of those with ECOG PS ≥ 2 started ICI in last 30 days of life and 24% started or continued ICI in their last 30 days, compared to 4% and 7% of ECOG PS < 2 (p = 0.005, p = 0.001, respectively). Receipt of ICI in last 30 days of life was associated with decreased hospice referral (OR 0.29, p = 0.006), decreased odds of hospice stay > 7 days (OR 0.15, p < 0.001), and increased in-hospital death (OR 6.8, p = 0.001). Conclusions: Adults with metastatic NSCLC and ECOG PS ≥ 2 experience significantly shorter survival than those with ECOG PS < 2 and more often receive ICI near the end of life, and late ICI use is associated with decreased hospice use and increased in-hospital death. Clinicians should thus use caution in extrapolating data from clinical trials, which are limited to ECOG PS < 2, to inform the care of adults with ECOG PS ≥ 2. Further, these results highlight potential tradeoffs of ICI and underscore the need for efforts to improve communication about ICI risks and benefits.