Eligible subjects in this study will be randomized to Arm A or Arm B at 1:1 ratio.~Arm A (HLX10 arm): HLX10 + chemotherapy(Carboplatin/Cisplatin-Etoposide)+concurrent radiotherapy; Arm B (placebo arm): Placebo + chemotherapy(Carboplatin/Cisplatin-Etoposide)+concurrent radiotherapy; The 4 stratification factors for randomization include: ECOG PS (0 or 1), staging (I/II or III), radiation fraction (bid or qd), and region (Asia or non-Asia).
This study is a randomized, double-blind, multicenter, phase III clinical study to compare the clinical efficacy and safety of HLX10 + chemotherapy+ concurrent radiotherapy vs chemotherapy+ concurrent radiotherapy in subjects with Limited-Stage Small Cell Lung Cancer.