Fig. 4

Risk Score is an independent prognostic biomarker for OSCC. A Forest plot of multiple Cox regression analysis. Compared to the reference, patients with Hazard ratio > 1 were considered higher death risk, and patients with Hazard ratio < 1 were considered lower death risk. B, C Kaplan–Meier survival curves in female and male subgroups, separately. D–E Kaplan–Meier survival curves of ≤ 61-year old and > 61-year old subgroups, separately. F–H Kaplan–Meier survival curves of patients in N0, N1, N2-N3 subgroups, separately