研究目的:
This is a randomized, double-blind, placebo-controlled, multicenter, Phase 3 study to compare the efficacy of tislelizumab + cisplatin or carboplatin + etoposide (Arm A) and placebo + cisplatin or carboplatin + etoposide (Arm B) as first-line treatment in approximately 455 participants who have previously untreated extensive-stage small cell lung cancer (ES-SCLC)