A large number of women with breast cancer take antioxidant supplements while undergoing cancer treatment without anyone knowing the consequences of doing so.
© AFP/File Philippe HuguenJune 08, 2009, (Sawf News) - Antioxidant supplements include vitamin C, vitamin E, beta-carotene, and selenium. They are found in individual supplements as well as in many multivitamins. Many breast cancer patients believe that antioxidant supplements will protect them from the side effects of breast cancer treatment, help prevent breast cancer recurrence, and improve their overall health.
However, the actual effects of taking antioxidants during cancer treatment are poorly understood and the findings to date are mixed. Some physicians believe antioxidants may in fact interfere with radiation and some types of chemotherapy, which often attacks tumor cells by generating reactive oxygen species (ROS), very small molecules that play a role in cell development.
Researchers led by Heather Greenlee of Columbia University Mailman School of Public Health in New York investigated the prevalence of antioxidant use in women with breast cancer in Nassau and Suffolk counties in New York State.
Dr. Greenlee's study is based on the 764 patients who completed a follow-up interview and provided information on antioxidant supplement use.
Among the 764 patients studied, 663 women (86.8 percent) reported receiving chemotherapy, radiation, or hormone therapy for breast cancer. Of these 663 women, six in ten (60.5 percent) reported using antioxidants during breast cancer treatment, which included chemotherapy, radiation, and tamoxifen (anti-estrogen) therapy.
About seven in ten antioxidant users (69.3 percent) used high doses, defined as higher than the dose contained in a Centrum multivitamin. Women who took high doses of antioxidants during treatment were more likely to be using tamoxifen and to have a history of eating more fruits and vegetables, using herbal products, and engaging in mind-body practices.
"Given the common use of antioxidant supplements during breast cancer treatment, often at high doses and in conjunction with other complementary therapies, future research should address the effects of antioxidant supplementation on breast cancer outcomes," including whether antioxidants affect treatment toxicities, treatment efficacy, cancer recurrence, and survival, say the authors.
The report is published in the July 15, 2009 issue of CANCER, a journal of the American Cancer Society.
News Copyright © Sawf News. May not be reproduced without explicit written permission