CHICAGO (AP) — Modern birth control pills that are lower in estrogen have fewer side effects than past oral contraceptives. But a large Danish study suggests that, like older pills, they still modestly raise the risk of breast cancer, especially with long-term use.

Researchers found a similar breast cancer risk with the progestin-only intrauterine device, and they couldn't rule out a risk for other hormonal contraceptives like the patch and the implant.

But the overall increased risk was small, amounting to one extra case of breast cancer among 7,700 women using such contraceptives per year. E...