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Kaplan-Meier curves analyses for OS according to the optimal cutoff value of FPR in each subgroup. a T1 + 2 subgroup; b T3 + 4 subgroup; c LN- subgroup; d LN+ subgroup; e tumor size < 5 cm subgroup; f tumor size ≥5 cm subgroup; g non-adjuvant chemotherapy subgroup; h adjuvant chemotherapy subgroup. Abbreviations: OS, overall survival; FPR, fibrinogen-to-prealbumin ratio; LN-, lymph nodes metastasis-negative; LN+, lymph nodes metastasis-positive
