Factors influencing local recurrence after abdominoperineal resection for cancer of the rectum.

Pelvic and perineal recurrences of cancer after rectal amputation are frequent, often isolated, and thus directly responsible for a fatal outcome by local decompression accidents or infection. This study explores the patterns of recurrence after "curative" operation for rectal cancers. One hundred thirteen patients who underwent abdominoperineal resection are reviewed: there were 36 local recurrences, i.e., an incidence of 31.8 percent. About 70 percent of these recurrences occurred within two years after surgical treatment. Low level of tumor in the rectum, local spread into perirectal fat or serosa, lymph node involvement, and histologic grade of malignancy were the only factors that were statistically related to local recurrence. The strategy for careful follow-up of patients at risk is outlined and a plea is made for a controlled trial of postoperative radiotherapy.