Should starting-age for breast cancer screening depend on risk?

The authors of a population-based study think it should

An analysis of more than five million Swedish women has identified starting ages for breast cancer screening based on family history of the disease.

Family tree showing some women affected by breast cancer

German-led researchers used Swedish registry data on nearly 5.1 million women, including some 119,000 who were diagnosed with invasive breast cancer.

Most of the women with breast cancer (86%) had no family history of the disease in first-degree or second-degree relatives.

Lifetime breast cancer risk for the 14% of women with