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Relapse-free survival (RFS) in rectal cancer according to (A) age, (B) gender, (C) CEA level, (D) histological type, (E) tumor depth, (F) nodal status, (G) clinical stage, (H) lymphatic invasion, and (I) venous invasion. Subgroups were compared with log-rank test. P values were provided when differences were significant (P<0.05) and as NS when differences were not significant.
