The clinicopathological characteristics of OSCC patients treated by segmental mandibulectomy.

S, surgery; RT, radiotherapy; CCRT, concurrent chemoradiotherapy.aUnavailable data: pN status (n = 1), margin (n = 3), perineural invasion (n = 1), vascular invasion (n = 1), lymphatic invasion (n = 1).bPatient who did not receive neck dissection (n = 1) was classified as pN0.cOptimal cut-off value for disease-free survival.dTumor depth was defined as the measured thickness from the surface of the normal mucosa to the deepest portion of the tumor.