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Kaplan–Meier survival curves for five-year OS stratified by different prognostic factors with statistical significance based on the (A) Age, (B) Histologic grade, (C) Tumor size, (D) AJCC 8th T stage, (E) NDLN, (F) Gender, and (G) Tumor location. (AJCC, American Joint Committee on Cancer; NDLN, the number of dissected lymph nodes).
