Combining cisplatin and mitomycin with radiotherapy in anal carcinoma.

PURPOSE: The European Organization for Research and Treatment of Cancer (EORTC) phase II study No. 22953 demonstrated the feasibility of reducing the overall treatment time of chemoradiation, delivering mitomycin C twice rather than once and fluorouracil during the whole treatment. We tested the feasibility of chemoradiation in anal carcinoma with mitomycin and cisplatin in a phase II study.

METHODS: Twenty-one patients with locally advanced anal carcinoma (15 women, 6 men) were treated. The first sequence of radiotherapy consisted of 36 Gy over four weeks. After a gap interval of 16 days, a second sequence of radiotherapy was given, delivering 23.4 Gy over 2.5 weeks. Mitomycin C was delivered at 10 mg/m(2) day 1 of each sequence and cisplatin was delivered at 25 mg/m(2)/week of each sequence.

RESULTS: The compliance rates for the first sequence with radiation, mitomycinm, and cispaltin (dose and timing) were 100 percent. The median duration gap was 16 days (14-30 days). The compliance rates for the second sequence with radiation, mitomycin, and cisplatin (dose and timing) were 100, 76.2, and 85.7 percent, respectively. Grade > or = 2 acute toxicities of 62, 29, 25, and 5 percent were observed for skin, diarrhea, hematologic, and renal toxicities, respectively. Nineteen patients were in complete response (90.5 percent).

CONCLUSIONS: Combining radiation with mitomycin and cisplatin in patients with locally advanced anal cancer is feasible. The results are promising. The EORTC is currently comparing this combination with mitomycin and 5-fluorouracil in a large phase II-III trial.