“…I: tumors arising in the base of tongue and the floor of the mouth [6-8, 21, 34]; II: tumors crossing the midline [6, 17-18, 29, 99]; III: advanced staging (cT3-4) [8,11,13,15,[17][18]29]; IV: primary tumor more than 3.75 mm thick [20]; V: multiple ipsilateral nodes involvement [8,13,21,29].…”