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Kaplan-Meier survival curve analysis for overall survival stratified by different clinical variables. (a) Age ≤ 65; (b) age > 65; (c) male; (d) female; (e) grades 3–4; (f) stages I–II; (g) stages III–IV; (h) T stages 1–2; (i) T stages 3–4; (j) N stage 0; (k) N stages I–X; (l) M stage 0; (m) M stages I–X. (The statistical method was a log-rank test for a single factor, with only one test and the reported P value was the P value).
