The primary objective of this study is to evaluate and compare major pathological response(MPR) rate and event-free survival (EFS) in participants receiving tislelizumab plus platinum-based doublet chemotherapy as the new additional treatment followed by tislelizumab as adjuvant treatment versus participants receiving placebo plus platinum-based doublet chemotherapy as neoadjuvant treatment followed by placebo as adjuvant treatment.
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Major pathological response (MPR) in Intent-to-Treat (ITT) analysis set
Timeframe: Up to 3 months following completion of neoadjuvant treatment
Event-free survival (EFS) in ITT analysis set as Assessed by the Blinded Independent Central Review (BICR)
Timeframe: Up to 5 years