A Randomized Phase 2 Trial of TAS-114 in Combination With S-1 Versus S-1

This is a randomized, open-label, Phase 2 study of TAS-114 administered in combination with S-1, to investigate the efficacy, safety and tolerability of the TAS-114/S-1 regimen in patients with advanced or metastatic NSCLC. The study will be conducted internationally in 2 regions: Asian \[Japan\] and Western \[Europe and US\]. Patients will be randomized into TAS-114/S-1 arm versus S-1 control arm in a 1:1 ratio.