Prognosis and recurrence patterns of anal adenocarcinoma

Anal adenocarcinomas are rare cancers, constituting fewer than 10% of all anal cancers. This is a retrospective review of 10 patients with anal adenocarcinoma.

Seven men and 3 women with a median age of 59 years (range 38 to 82) participated in the study. Using the 1976 World Health Organization classification, 4 patients had the rectal type of cancer, 2 had the anal duct type, and 1 had the anorectal fistula type. The 3 remaining patients had unclassifiable tumors with solely extramucosal disease. Seven patients underwent abdominoperineal resection, 1 had a radical vulvectomy and proctectomy, and 2 had local excision.

The median survival was 29 months (range 5 to 249). Seven patients developed a recurrence at the following sites: 2 perineal, 5 inguinal, and 5 distant metastases. Five patients died from their disease a median of 28 months after surgery, and 2 patients died of unrelated causes. Three patients are alive at a median of 54 months; 2 of these patients are free of disease and 1 has a perineal recurrence.

Anal adenocarcinomas were found to be a rare, heterogeneous group of tumors with a poor prognosis despite radical surgery.