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Radiotherapy of carcinoma of the floor of the mouth.

Among 130 irradiated patients with carcinoma of the floor of the mouth, the actuarial five-year survival rate was 62%. Of these patients, 79% were free of metastatic adenopathy, and their survival rate was 75%. The curability of carcinoma of the floor of the mouth is almost independent of the size of the primary lesion if metastases are absent. Prophylactic neck dissection was not found to be necessary. The three-year survival of patients in whom cervical metastases developed after irradiation was 77%.