Safety of First-line Nivolumab Plus Ipilimumab in Patients With Metastatic Non-Small Cell Lung Cancer: A Pooled Analysis of CheckMate 227, CheckMate 568, and CheckMate 817.

We characterized first-line nivolumab plus ipilimumab (NIVO+IPI) safety in a large patient population with metastatic non-small cell lung cancer (NSCLC) and efficacy outcomes after NIVO+IPI discontinuation due to treatment-related adverse events (TRAEs). We pooled data from three first-line NIVO+IPI studies (NIVO, 3 mg/kg or 240 mg every 2 weeks; IPI, 1 mg/kg every 6 weeks) in metastatic NSCLC (CheckMate 227 Part 1, CheckMate 817 cohort A, CheckMate 568 Part 1). Safety endpoints included TRAEs and immune-mediated adverse events (IMAEs) in the pooled population and patients aged ≥75 years. In the pooled population (N=1255), any-grade TRAEs occurred in 78% of patients, grade 3/4 TRAEs in 34%, and discontinuations of any regimen component due to TRAEs in 21%. The most frequent TRAE and IMAE were diarrhea (20%; grade 3/4, 2%) and rash (17%; grade 3/4, 3%), respectively. The most common grade 3/4 IMAEs were hepatitis (5%) and diarrhea/colitis and pneumonitis (4% each). Pneumonitis was the most common cause of treatment-related death (5/16). Safety in patients aged ≥75 years (n=174) was generally similar to the overall population, but discontinuations of any regimen component due to TRAEs were more common (29%). In patients discontinuing NIVO+IPI due to TRAEs (n=225), 3-year overall survival was 50% (95% CI: 42.6-56.0), and 42% (31.2-52.4) of 130 responders remained in response 2 years after discontinuation. First-line NIVO+IPI was well tolerated in this large population with metastatic NSCLC and in patients aged ≥75 years. Discontinuations due to TRAEs did not reduce long-term survival