Late side effects of short-course preoperative radiotherapy combined with total mesorectal excision for rectal cancer: Increased bowel dysfunction in irradiated patients - A dutch colorectal cancer group study

Purpose Preoperative short-term radiotherapy improves local control in patients treated with total mesorectal excision (TME). This study was performed to assess the presence and magnitude of long-term side effects of preoperative 5 x 5 Gy radiotherapy and TME. Also, hospital treatment was recorded for diseases possibly related to late side effects of rectal cancer treatment. Patients and Methods Long-term morbidity was assessed in patients from the prospective randomized THE trial, which investigated the efficacy of 5 x 5 Gy before THE surgery for mobile rectal cancer. Dutch patients without recurrent disease were sent a questionnaire. Results Results were obtained from 597 patients, with a median follow-up of 5.1 years. Stoma function, urinary function, and hospital treatment rates did not differ significantly between the treatment arms. However, irradiated patients, compared with nonirradiated patients, reported increased rates of fecal incontinence (62% v 38%, respectively; P < .001), pad wearing as a result of incontinence (56% v 33%, respectively; P < .001), anal blood loss (11 % v 3%, respectively; P = .004), and mucus loss (27% v 15%, respectively; P < .005). Satisfaction with bowel function was significantly lower and the impact of bowel dysfunction on daily activities was greater in irradiated patients compared with patients who underwent THE alone. Conclusion Although preoperative short-term radiotherapy for rectal cancer results in increased local control, there is more long-term bowel dysfunction in irradiated patients than in patients who undergo THE alone. Rectal cancer patients should be informed on late morbidity of both radiotherapy and TME. Future strategies should be aimed at selecting patients for radiotherapy who are at high risk for local failure.