PMID: 9191520Jun 15, 1997Paper

The impact of treatment factors on local control in T2-T3 anal carcinomas treated by radiotherapy with or without chemotherapy

Cancer
A S AllalJ M Kurtz

Abstract

This study was conducted to investigate the influence of therapeutic parameters on local control (LC) in the sphincter-conserving treatment of T2-T3 anal carcinoma. From 1976 to 1993, 137 patients with anal carcinoma classified as T2 (85 patients) or T3 (52 patients) were treated curatively by radiotherapy (RT) alone (54 patients) or by concomitant chemotherapy and RT (83 patients). RT was delivered in two sequences, with a median gap of 46 days between the sequences. The first sequence was delivered at a median dose of 39.6 gray (Gy) using megavoltage photon beams. Boost treatment consisted of either 192Ir implantation or external beam RT (median dose, 20 Gy). Chemotherapy started on Day 1 and generally consisted of 1 cycle of mitomycin C (10 mg/m2) and a 5-day infusion of 5-fluorouracil (600-800 mg/m2/day). For surviving patients, median follow-up was 83 months. Univariate and multivariate analyses were performed to determine therapeutic parameters affecting LC after adjustment for clinical factors. The 5-year actuarial LC was 76%. Factors associated with poorer LC (univariate) were as follows: age < 66 years (LC was 67% with the factor vs. 85% without), male gender (65% vs. 81%), tumor extent > 1/3 canal circumference (67% v...Continue Reading

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