Brachytherapy for squamous cell carcinoma of the lip. The experience of the Institute of Radiology of the University of Rome "La Sapienza".

Abstract

Cancer of the lip is the most common malignancy occurring in the oral cavity. The aim of our retrospective study was to review the results of patients with lower lip squamous cell carcinoma who were treated with radiotherapy. From 1970 to 1992, 57 patients with squamous cell carcinoma of the lower lip were treated at the Institute of Radiology of the University of Rome "La Sapienza" with low-dose rate interstitial brachytherapy. According to the UICC 1992 TNM classification, the disease stage was T1 in 27 (47%) cases, T2 in 20 (35%) and T3 in 10 (18%); 8 patients (14%) were cN+. The median tumor dose was 62 Gy (range, 44-96): 10 patients (18%) received a total dose < 50 Gy, 28 (49%) between 50 and 70 Gy, and 19 (33%) > 70 Gy. The cN+ cases were irradiated to total doses of 65-70 Gy on the involved station. All patients obtained complete remission. The actuarial overall survival rates at 3, 5 and 10 years were 95%, 76% and 53%; actuarial disease-free survival at 3, 5 and 10 years was 84%, 81%, and 81%, respectively. Actuarial cause-specific survival was 98%, 88% and 84% at 3, 5 and 10 years, respectively. Actuarial local control rate was 90% at 3 and 5 years, rising to 94% with salvage surgery. Local-regional control was obtained in 90% and 86% of patients at 3 and 5 years, and in 93% and 89% of cases, respectively, following surgery. Five of 11 deaths were due to local-regional or distant disease recurrence. Tumor stage and positivity of regional nodes were the only predictive factors of survival and disease control. Radiation-induced morbidity was very low, and all patients considered their cosmetic outcome at least satisfactory.