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Study flowchart. The study was performed in multicenter cohorts including Guangdong (Sun Yat‐sen University Cancer Center), Beijing (National Cancer Center), Zhengzhou (the Affiliated Cancer Hospital of Zhengzhou University), and Anyang (the Anyang Cancer Hospital). Abbreviations: pCR, pathologically complete response; <pCR, less than pCR; qPCR, real‐time quantitative polymerase chain reaction; FLDA, Fisher's linear discriminant analysis
