[The therapeutic results and early and late toxicities of the treatment of anal canal carcinoma by radiotherapy or chemoradiotherapy].

From 1975 to 1989 114 patients with anal canal carcinoma were treated, 81 of these with radiotherapy (RT) alone and 33 with chemoradiotherapy (CRT), 80% respectively 82% of the patients were colostomy-free at the onset of therapy. RT was given to a total dose of 60 Gy in six weeks, for CRT additional simultaneous 5-fluorouracil (500 mg/m2 days 1 to 5 and 8 to 12) and mitomycin C (5 mg/m2 days 5 and 12) was administered. 67% respectively 82% of the patients had UICC stage II to IIIB disease predominantly with G2 and G3 squamous cell carcinomas. Local control after three years was 79% for the RT group vs. 82% for the CRT group. Three-year survival rate was 68% and 71%, respectively. These differences were not significant. Only for G1- compared to G3-tumors there is a significantly higher survival rate. Acute and late damage was slightly lower for the RT treatment group (77% and 25%) compared to the CRT group (79% and 30%). In both treatment groups there was one patient needing a permanent colostomy due to radiation induced proctitis. In conclusion, RT or CRT should be the primary form of treatment in patients with and canal carcinoma and abdominoperineal resection should only be performed in case of local recurrence or tumor persistence. The final decision about the indications for RT or CRT can only be made with the results of a prospective randomized trial.