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Before and after PSM, K-M survival curve analysis was performed on OS and CSS of PORT patients and non-PORT patients stratified by LN removal status. Before PSM: (A, C) OS and CSS of patients who did not undergo LN removal, (B, D) OS and CSS of patients who underwent LN removal. After PSM: (E, G) OS and CSS of patients who did not undergo LN removal, (F, H) OS and CSS of patients who underwent LN removal
