Nivolumab safety profile in Asian and Western patients with chemotherapy-refractory (CTx-R) advanced gastric/gastroesophageal junction (adv G/GEJ) cancer from the ATTRACTION-2 and CheckMate-032 trials.

90Background: Nivolumab (NIVO) monotherapy demonstrated a survival benefit and durable responses in pts with CTx-R adv G/GEJ cancer (Boku N et al ESMO 2017; Janjigian Y et al ASCO 2017). Here we describe the safety profile of NIVO in Asian (A) and Western (W) pts with CTx-R adv G/GEJ who had received ≥ 2 prior CTx in the ATTRACTION-2 and CheckMate-032 trials, respectively. Methods: The safety population included pts who received ≥ 1 dose of study drug at the data cutoff of August 2016 for ATTRACTION-2 and March 2016 for CheckMate-032. TRAEs, serious TRAEs, and select TRAEs (sTRAE; with a potential immune-related etiology) were assessed. sTRAEs were managed using protocol-specified algorithms, which included corticosteroids as immune-modulating treatment (tx). Time to onset and resolution of sTRAEs were also assessed. Results: Median duration of NIVO tx was 1.9 mo in A and 2.3 mo in W pts. TRAEs (any grade) were reported in 43% of A and 64% of W pts; grade 3–4 TRAEs (A pts:10%; W pts:14%), serious TRAEs (A...