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Overall survival and progression-free survival time of patients with or without favorable prognostic factors. A: P < 0.001; B: P = 0.001. 0: KRAS mutation and loss of phosphatase and tensin (PTEN); 1: Either no KRAS mutation or normal PTEN expression; 2: No KRAS mutation and normal PTEN expression. OS: Overall survival; PFS: Progression-free survival.
