Figure 6. Kaplan-Meier analyses of HNSCC patient subgroups and clinicopathology factors including. (A) age ≥65 years, (B) age < 65 years, (C) female, (D) male, (E) non-alcohol, (F) alcohol, (G) Nonsmoking, (H) smoking, (I) G1 and 2, (J) G3 and 4, (K) stage I-II, (L) stage III-IV, (M) non-recurrence, (N) recurrence, (O) M0 stage (p < 0.05).