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Kaplan-Meier curves for overall survival (OS) (A) and progression-free survival (PFS) (B) in stage II and III thymoma patients. Kaplan-Meier curves demonstrate no statistically significant difference in OS (P = 0.95, log-rank test) or PFS (P = 0.63, log-rank test) between stage II and III patients undergoing surgery alone versus surgery plus radiation (solid line: S alone; dotted line: S + RT).
