The study said that of the almost two million women who were followed on average of almost 11 years, the breast cancer risk for women using the pill increased more the longer they used it - rising from 20 to 38 percent depending on length of time used, CNN reported.
It turns out those newer birth control pills don't lower breast cancer risk. They found that, for every 100,000 women, there were 68 cases of breast cancer per year in women using hormonal birth control versus 55 annual breast cancer cases among those who didn't.
Even before the new study, the World Health Organization and medical groups recommended against hormonal contraception for breast cancer survivors and women at high risk of the disease because of family history or breast abnormalities. This risk increased from 1.09 with less than 1 year of use to 1.38 with more than a decade of use.
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As well as discovering the risk disappeared within approximately five years of stopping oral contraception, it also found that women who had ever used the pill were less likely to have colorectal, endometrial or ovarian cancer than women who had never used the pill. In current and recent users of any type of hormonal contraception, the risk of breast cancer was 20 per cent increased. Vigilance, including monthly self-checks, yearly appointments, and knowing your personal normal, has never been more central to women's breast health-or well-being.
Researchers found that among women taking the pill for five years, there would be an extra one breast cancer diagnosis for every 1,500 women.
The benefits persisted for many years after stopping the pill, perhaps 30 or more years.
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Users of progestogen only contraceptives - mainly pills and the hormone-intrauterine system (IUS) - also experienced an increased relative risk of breast cancer.
She said: 'That newer combined contraceptive pills may also carry a slight breast cancer risk is an important finding, and one that will help women make an even more informed decision when choosing to use the pill. Women see their doctors about contraception. "Women just need to be aware of the risks".
"I do encourage people to talk with their doctor and not go running off their birth control", Hobart said. "Thus, it is not exclusively estrogen that increases the risk of breast cancer".
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The study also looked at younger people, when older people are more often diagnosed with cancer, Hobart said. The study's disclosure statement also notes that two of the current study's authors joined the foundation after the paper was published. Such a study would be useful, he said, to show that hormonal contraception, "risks and all", may be essential to preventing pregnancy in some women with high risk for other medical conditions, such as diabetes. Experts believe that this is more of a public health issue than an individual health worry - the risk is 'small but it's measurable, and if you add up all the millions of women taking the pill, it is a significant public health concern.' oncologist Dr. Marisa Weiss told the New York Times.