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 19 February 2018

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News

Long-term risk of urinary adverse events in curatively treated patients with rectal cancer

The most recent issue of the Diseases of the Colon & Rectum examines long-term risk of urinary adverse events in curatively treated patients with rectal cancer.

News image

Treatment modalities for rectal cancer, including radiation, are associated with urinary adverse effects.

Dr Mary Kwaan and colleagues determined the influence of surgery and radiation therapy for rectal cancer on long-term urinary complications.

Using the Surveillance Epidemiology and End Results–Medicare data set from the United States, patients with rectal cancer older than 66 years of age who underwent rectal resection between 1992 and 2007 were stratified into treatment groups that accounted for surgical resection and the timing of radiation therapy, if used.

A control group of patients who did not have rectal cancer were matched by age, sex, demographics, and comorbidities.

56% had surgical resection alone
Diseases of the Colon & Rectum

The team's primary outcome was a urinary adverse event defined as a relevant urinary diagnosis with an associated procedure. Patients with rectal cancer in different treatment groups were compared with control patients using a propensity-adjusted, multivariable Cox regression analysis.

The study was conducted with the Surveillance Epidemiology and End Results–Medicare data set from the United States at our institution.

The researchers noted that of the 11,068 patients with rectal cancer, 56% had surgical resection alone, 22% received preoperative radiation, and 22% received postoperative radiation.

The median follow-up for all of the groups of patients was more than 2 years.

The research team observed that all of the groups of patients with rectal cancer were more likely to develop a urinary adverse event compared with control subjects.

Adjusted hazard ratios were 2.3 for abdominoperineal resection alone, 2.24 for preoperative radiation and surgical resection, 2.04 for surgical resection and postoperative radiation, and 1.7 for low anterior resection alone.

Dr Kwaan's team concludes, "Rectal cancer surgery with or without radiation is associated with a higher risk of urinary complications requiring procedures."

"Patients who undergo low anterior resection without radiation tend toward the lowest risk for a urinary adverse event."

Dis Colon Rectum 2017: 60(7): 682–690
07 July 2017

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