Squamous-cell carcinoma of the anal canal: predictors of treatment outcome

Diseases of the Colon and Rectum
Ramin RoohipourLarissa K F Temple

Abstract

The incidence of anal canal squamous-cell carcinoma is increasing. Limited data exist on predictors of treatment failure. This study was designed to identify predictors for relapse/persistence after first-line therapy. Using one database, we identified 131 Stages I-III patients treated for primary anal canal squamous-cell carcinoma at our institution from December 1986 to August 2006, with minimum six-month follow-up. Demographic, pathologic, treatment, and outcome data were extracted. Treatment failure was defined as biopsy-proven persistence or relapse (local and/or distant). Univariate, bivariate, and multivariate survival analyses were performed. Of 131 patients (median age, 58.3 years; median follow-up, 2.9 (range, 0.6-11.2) years), 66 percent were females, 43.5 percent were Stage II, and 11 (8 percent) were HIV-positive. Surgery only (local excision) was uncommon (6.9 percent, n=9). One hundred twenty-two patients (93.1 percent) received radiotherapy; two required preradiotherapy diversion. Although 114 (93.4 percent) completed radiotherapy, most required treatment breaks, making total duration of radiotherapy longer than planned. Almost all patients undergoing radiotherapy (96.7 percent, 118/122) also had chemotherapy: 1...Continue Reading

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