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Survival curves of patients with different tumor stages. Overall survival rates are presented according to the disease stage and p16INK4a status in (A) stage I/II tumor types and (C) stage III/IV tumor types. Disease-free survival rates are presented according to the disease stage and p16INK4a status in (B) stage I/II tumor types and (D) stage III/IV tumor types. p16INK4a, cyclin-dependent kinase inhibitor 2A.
