Breast Cancer Treatment: Harm with Vitamin Supplements

A new study suggests that patients with breast cancer who take additional vitamins during chemotherapy treatment may face increased risks. Researchers said the use of dietary supplements that increase levels of antioxidants; iron, vitamin B12 and omega-3 fatty acids appeared to lower the effectiveness of chemotherapy. Some doctors have been advising patients for a number of years not to take antioxidants during chemotherapy. In the earlier research, people who took part were asked about their use of supplements at the beginning of and during treatment, and about their lifestyle, diet and exercise. The researchers searched for other possibilities that might increase the risk of the disease reappearing or of death. They found that patients who took any supplements at the beginning of and during chemotherapy were 41 % more likely to have their breast cancer return than those who did not. In addition, the supplement takers were 40 % more likely to die later on compared to patients using no supplements. The supplements included vitamin A, C and E. Those taking vitamin B12 and iron supplements were at greater risk of cancer returning, the researchers said. Women taking vitamin B12 were 83 % more likely to experience a return of their disease and 22 % more likely to die from it than those not taking those supplements. Those taking omega-3 supplements were 67% more likely to have the disease return. That percentage rose to 79 for those taking iron supplements.

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