1437PPhase I dose expansion data for M6620 (formerly VX-970), a first-in-class ATR inhibitor, combined with gemcitabine (Gem) in patients (pts) with advanced non-small cell lung cancer (NSCLC). - Plummer, R; Cook, N; Arkenau, T; Melear, J; Redfern, C; Spira, A I; Chung, K; Haddad, T; Ramalingam, S S; Wesolowski, R (Annals of Oncology, 2018)