Since the study results are based on men who were treated for prostate cancer prior to 1995, the risk of developing cancer may be reduced by the evolution of radiation delivery techniques. However, researchers say that even with today's technology, some portions of the rectum might still receive a high dose of radiation. Therefore, the risk of rectal cancer may still be substantial and thus, until proven otherwise, men treated with radiation for prostate cancer need monitoring for rectal cancer beginning five years after treatment.

Guidelines of multiple agencies and professional societies underscore the importance of colorectal cancer screening for all individuals 50 years of age and older. Approved tests include barium enema, FOBT, flexible sigmoidoscopy and colonoscopy. However, flexible sigmoidoscopy and colonoscopy are the best methods for accurately detecting rectal cancer. Each screening option has advantages and disadvantages. Patients undergoing radiation therapy for prostate cancer are advised to ask their doctor about one of the approved screening methods, regardless of their age.

More information about colorectal cancer screening is available at www.gastro.org.

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Contact: Kimberly Wise
media@gastro.org
301-941-2620
American Gastroenterological Association
1-Apr-2005