During follow-up of almost 7 years, hormone-releasing IUD use conferred a 40% higher risk of breast cancer. The data showed a trend toward increasing risk with duration of IUD use, reaching 80% among women who reported using the devices for 10-15 years.

The study found an 'unexpected' association between the use of an intrauterine system, also known as an hormonal coil, and an increased risk of the cancer in women aged 15 to 49

A new study adds to a growing set of evidence that women who use hormonal birth control have higher rates of breast cancer, but experts have stressed that the overall risk remains low.

Women who used hormone-releasing IUDs were found to have a 40% higher chance of developing breast cancer compared to those who didn’t use hormonal contraceptives, according to a JAMA study.