A, Kaplan-Meier curve showing cancer-free survival (CFS) reported in months from the time of trial registration to the first of oral squamous cell carcinoma, death, or censored at last follow-up. B, Forest plot showing the hazard ratio and 95% CIs (log 10) of the association of clinical and pathologic variables with CFS (hazard ratio >1 indicates higher risk of CFS event). Univariate Cox proportional hazard model. CPS indicates combined positive score; PD-L1, programmed cell death 1 ligand 1; TMB, tumor mutational burden.