Not All Antioxidants Are Good for Cancer Patients
Many people want to maintain health by drinking several types of supplements that contain antioxidants. Unfortunately, not all antioxidant supplements are well consumed. For cancer patients, some types of antioxidants may actually be harmful. The risk of death or recurrence of breast cancer patients taking antioxidants may increase or decrease, depending on the type of vitamin used. Among the 2,300 women with early-stage breast cancer who regularly take vitamin C or E, the researchers found that the risk of cancer recurrence was lower than those who did not take vitamins for five years. While women who regularly consumed carotenoid mixture had a higher risk of dying from breast cancer than women who did not consume. Which includes carotenoids include nutrients such as vitamin A, beta-carotene and lutein. "" According to our study, dietary supplements containing high-dose carotenoids can be dangerous. Breast cancer patients should think twice before taking it, "said Heather Greenlee, an assistant professor of epidemiology at Columbia University in New York. Other studies have also found that giving beta-carotene supplements to smokers may increase the risk of lung cancer. As for other antioxidants, the American Cancer Society and the American Institute for Cancer Research say there is not enough evidence to recommend dietary supplements that can prevent cancer or cancer recurrence. Patients who use high-dose antioxidants during chemotherapy or radiation are also dangerous. Antioxidants protect the body’s cells from oxidative damage. While cancer and radiation drugs work by creating oxidative damage to cancer cells. So in theory, high-dose antioxidants can reduce the effectiveness of treatment. Research reported by Reuters on Monday (10/10/2011) shows that women with breast cancer usually use several types of antioxidant supplements. The findings are based on questionnaires and case data from 2,264 women in the US who were diagnosed with early-stage breast cancer. Overall, 81 percent of respondents said they would use at least one antioxidant supplement for two years after being diagnosed either in multivitamins or in vitamin supplements . Over the next five years, the study found that women taking a single vitamin C or vitamin E supplement for 6-7 days a week had a low risk of cancer recurrence. Of the 540 women taking vitamin C, 15 percent had breast cancer recurrence, compared with 19 percent of the 1,072 women who did not use vitamin C supplements. The difference is almost the same as the researchers observed vitamin E. On the other hand, women who used a combination of carotenoids had a higher risk of dying from breast cancer. Of the 89 women who took carotenoids 6-7 days per week, 18 percent died of breast cancer, compared with less than seven percent of women who did not use carotenoid combinations. According to Greenlee, many of the benefits associated with vitamin C and E. Women using dietary supplements tend to have healthy habits in general. "" Antioxidant supplements should not be considered to have the same effect. Several types of them are made up of different molecules and have different effects, "" Greenlee concluded.
(ir / ir)