1354P - Utilization of real-world data to assess the effectiveness of immune checkpoint inhibitors (ICIs) in elderly patients with metastatic melanoma

Abstract

BackgroundThe widespread introduction of ICIs in patients (pts) with metastatic disease has significantly improved outcomes. However, ICIs in the elderly requires further evaluation to determine whether outcomes differ from that observed in younger cohorts. The goal of this study is to utilize real-world data from the Canadian Melanoma Research Network Registry. MethodsThis retrospective observational study was performed in metastatic pts entered into a common clinical registry and who received ipilimumab alone (ipi) and nivolumab (nivo) or pembrolizumab (pembro) from 2008 to February 2019. Demographics, extent of disease, all treatments and adverse events (AEs) were compiled. Comparisons between pts in different age cohorts were made. The potential impact of known prognostic factors was investigated using Cox proportional multivariate analyses. Results144 pts over 70 were treated with ICI as 1st line. 43 patients received ipi and 101 received nivo or pembro. BRAF mutation was present in 17%. Pulmonary mets: 56%; Liver mets 34%; Brain mets: 16%. For those aged 70-99, median survival was 10M (range: 1M - 50 M). In a comparative cohort of pts aged 50-69, the median survival was 11.8M (range: 1M – 78 M). On multivariate analysis age, baseline LDH and BRAF status did not impact overall survival. Within the elderly cohort, the use of ipi was associated with significantly decreased overall survival when compared to nivo and pembro (OS ipi: 6.8M vs anti-PD1: 10.6 M). 95 pts over 70 received ICIs as 2nd line, with a median survival of 6.3 M, which was not significantly different from the younger cohort who received second-line ICIs (median survival of 8 M). In the elderly cohort, 124 >grade 2 AEs were observed: Rash 25%; Colitis: 18%; Fatigue: 8%; Asthenia: 7%. ConclusionsICIs can be effectively utilized in pts over 70. Survival appears to be comparable to that achieved in younger cohorts. Elderly pts who only received ipi appeared to have a worse outcome than those pts who received nivo or pembro. Legal entity responsible for the studyGlobal Melanoma Research Network. FundingGlobal Melanoma Research Network. DisclosureAll authors have declared no conflicts of interest.