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Dietary Supplements Discouraged for Patients Undergoing Radiation for Prostate Cancer ARLINGTON, Va -- March 8, 2010 -- Prostate-specific dietary supplements should not be taken during radiation therapy treatments because they have been shown to increase the radiosensitivity of normal prostate cell lines, leading to normal tissue complications, according to a study published in the March issue of the International Journal of Radiation Oncology*Biology*Physics. Many prostate cancer patients choose to take nutritional supplements to improve or increase sexual potency and alleviate symptoms associated with poor prostate health. Some studies show that about half of prostate cancer patients use an herbal or dietary supplement and most do so without discussing it with their physician. There have been published reports of negative clinical effects for some tumour sites from the use of certain dietary supplements after chemotherapy, but the effect of dietary supplements on radiation therapy treatments is not well-known. Brian Marples, PhD, William Beaumont Hospital, Oakland University William Beaumont School of Medicine, Royal Oak, Michigan and colleagues sought to determine if 3 widely used commercial prostate-specific dietary supplements changed the radiosensitivity of normal prostate and/or androgen-positive and -negative prostate tumour cell lines. The study authors found that the cell growth and radiosensitivity of the malignant tumour cells were not affected by any of the supplements, but 2 of the supplements inhibited the growth rate of the normal prostate cell lines while a third supplement also increased the cellular radiosensitivity of some normal cell lines by inhibiting DNA repair. “Cancer patients turn to supplements to aid in their treatments for a variety of reasons, but this study proves that what some patients believe is helping them may actually be harming them,” said Dr. Marples. “It is very important for all patients to discuss any type of supplement they may be taking with their physician and especially important for prostate cancer patients receiving radiation therapy as this study shows that it may be negatively affecting the effectiveness of their treatments.” SOURCE: American Society for Radiation Oncology E-mail this page to a friend or colleague! To print, use this version