US scientists found, some pills with high levels of oestrogen can raise the risk threefold, compared with that of women who have never used the pill or who have stopped using it.
Women taking birth control pills have a 50 per cent higher overall risk of developing breast cancer, a new study has found. US scientists found, some pills with high levels of oestrogen can raise the risk threefold, compared with that of women who have never used the pill or who have stopped using it.
The study conducted by the Fred Hutchinson Cancer Research Center in Seattle also states that the pills containing low-dose hormones carried no extra risk.
Dr Elisabeth Beaber of the Center said that the results of the study suggested use of contemporary oral contraceptives in the past year was associated with an increased breast cancer risk ‘relative to never or former oral contraceptive use.
This risk may vary by oral contraceptive formulation. “Our results require confirmation and should be interpreted cautiously,” she said.
Previous studies have suggested the increased risk declined after women stopped taking the pills, Dr Elisabeth added.
The study involved 23,000 women and claims to be the first to look at up-to-date formulations of oral contraceptives used in the 1990s and 2000s.
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Pills containing high-dose oestrogen raised breast cancer risk 2.7-fold, or 170 per cent, while those with moderate-dose oestrogen increased the risk 1.6-fold.
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Meanwhile, Sarah Williams at Cancer Research UK said women should not stop taking the Pill on the basis of this study and discuss any concern with their GP or family planning service.
The study was published in Cancer Research, a journal of the American Association for Cancer Research.
Source-Medindia