Over the past week or so, it’s likely you would have come across headlines linking hormonal contraception to breast cancer.
These stories were sparked by a large, Danish study published in The New England Journal of Medicine, which found a slightly higher number of breast cancer cases among women who use hormone-based birth control methods, including the pill, implants and intrauterine devices.
While the findings are significant, many medical professionals have expressed concern that it may cause unnecessary alarm among women.
So is there reason to worry? Or has this research been over-blown? Here’s what you need to know.
Why is this study such a big deal?
While the link between breast cancer and hormonal contraceptives has been reported for years, this study is the first to examine the risks associated with modern, lower-dose formulations in a large number of people. (By large, we mean 1.8 million Danes aged between 15 and 49, all of whom were followed over the course of a decade.)
Also significant, is the fact that the study included ‘long-acting reversible contraceptives’ (LARCs), namely implants and IUDs, and found that there is minimal difference in the risk posed by each.
As American oncologist Dr Marisa Weiss summarised to The New York Times, “This is an important study because we had no idea how the modern day pills compared to the old-fashioned pills in terms of breast cancer risk, and we didn’t know anything about IUDs… Gynaecologists just assumed that a lower dose of hormone meant a lower risk of cancer. But [the study shows that] the same elevated risk is there.”