Oral Contraceptives May Reduce Ovarian and Endometrial Cancer Risk Even 35 Years After Discontinuation

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Oral Contraceptives May Reduce Ovarian and Endometrial Cancer Risk  Even 35 Years After Discontinuation

Oral contraceptive use is associated with a decreased risk of ovarian and endometrial cancer 3 decades after discontinuation, according to an analysis of data from more than 250,000 women.

At the same time, oral contraceptive use is associated with a short-term increased risk of breast cancer after discontinuation, although the lifetime risk of breast cancer is not significantly different, the researchers found.

The absolute risk of breast cancer after discontinuation is “extremely small” and should be a limited factor when deciding whether to start oral contraceptive pills (OCPs), a doctor said.

The study was conducted by Torgny Karlsson, PhD, a researcher in the department of immunology, genetics, and pathology at Uppsala (Sweden) University, and colleagues and published online in Cancer Research.

Reinforcing and Extending Knowledge

“These findings are generally consistent with what is known, but extend that knowledge, most notably by the longer-term follow-up for the cohort,” commented Nancy L. Keating, MD, MPH, professor of health care policy and medicine at Harvard Medical School and a physician at Brigham and Women’s Hospital, both in Boston. “Other studies have also shown that OCPs lower risk of ovarian and endometrial cancer. This study suggests that this protective benefit extends up to 30-35 years after discontinuing OCPs.”

“Surprisingly, we only found a small increased risk of breast cancer among oral contraceptive users, and the increased risk disappeared within a few years after discontinuation,” Åsa Johansson, PhD, a researcher in the department of immunology, genetics, and pathology at Uppsala University and one of the study authors, said in a news release. “Our results suggest that the lifetime risk of breast cancer might not differ between ever and never users, even if there is an increased short-term risk.”

Oral contraceptives today typically use lower doses of estrogen and other types of progesterone, compared with formulas commonly used when participants in the study started taking them, so the results may not directly apply to patients currently taking oral contraceptives, the researchers noted.

This article originally appeared on MDedge.com, part of the Medscape Professional Network.

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