Comparison of the erectile function in male patients with rectal cancer treated by preoperative radiotherapy followed by surgery and surgery alone

This study evaluates the erectile function of male patients treated by preoperative radiotherapy followed by surgery and surgery alone for locally advanced rectal cancer.A total of 112 men treated by total mesorectal excision with autonomic nerve preservation were included. Seventy-three patients were treated by preoperative radiotherapy followed by surgery (RTS group), and 39 were treated by surgery alone (surgery group). Patients filled out the five-item version of the international index of erectile function (IIEF-5) questionnaire at least 6 months after initial erectile function assessment. We analyzed the impact of age, surgery type, location, and size of tumor on erectile function.Total score was decreased significantly at follow-up compared to initial assessment in both RTS and surgery group (20.31 +/- 4.39 vs. 11.52 +/- 4.83, P = 0.012; 19.86 +/- 4.61 vs. 14.07 +/- 6.37, P = 0.031, respectively). Score difference was statistically higher in RTS group compared with surgery group (P = 0.028). In terms of surgery type for RTS group, score difference was statistically higher in the patients with abdominoperineal resection (APR) compared with those with lower anterior resection (P = 0.023). In comparison of score difference according to tumor location, difference was statistically higher in the patients with lower rectal cancer compared with those with upper rectal cancer (P = 0.017).The erectile functions of patients treated by preoperative radiotherapy followed by surgery are more affected than that of patients treated by surgery alone in locally advanced rectal cancer. Also APR and lower rectal cancer were significantly associated with erectile dysfunction in the patients treated by preoperative radiotherapy followed by surgery.