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Kaplan-Meier curves for progression-free survival (PFS) in resection margin-positive (A) and resection margin- negative (B) stage II and III thymoma patients. For margin-positive stage II and III thymoma, no significant differences were observed between S + RT versus S alone (P = 0.467). For margin- negative stage II and III thymoma, no significant differences were observed between S + RT versus S alone (P = 0.847) (solid line: S alone; dotted line: S + RT).
