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Prognostic impact of age and smoking history in OSCCs. Shown are Kaplan-Meier estimates of the overall survival (A, C) and progression free survival (B, D) of OSCC patients stratified by age [< 60 years or ≥ 60 years, (A, B)] and tobacco use history [active, never or quit, (C, D)]. HR: hazard ratio, CI: 95% confidence interval.
