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Kaplan‐Meier curves for CSS and OS before PSM. Cancer‐specific survival (A) and overall survival difference (B) between preoperative radiation and no preoperative radiation groups, before 1:1 Propensity Score Matching analysis. *P = 0.014 for PrORT group compared to no‐PrORT group for CSS; **P = 0.002 for PrORT group compared to no‐PrORT group for OS
