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a, b) Kaplan-Meier curves of disease-free survival (DFS) and overall survival (OS) are shown in different study groups (SGs), with numbers of subjects at risk indicated. SG1, CRT + TME; SG2, CRT + mFOLFOX6 (two cycles) + TME; SG3, CRT + mFOLFOX6 (four cycles) + TME; SG4, CRT + mFOLFOX6 (six cycles) + TME. CRT, chemoradiotherapy; TME, total mesorectal excision.
