Key Takeaways

As many as a quarter of breast cancers occur in women younger than 50

20% to 24% of breast cancers were found among women 18 to 49

Breast cancer screening should be tailored to a woman’s individual risk, researchers argue

TUESDAY, Dec. 2, 2025 (HealthDay News) — As many as 1 in 4 breast cancers occur in women younger than 50, a new study has found.

Among seven outpatient clinics in the New York region, 20% to 24% of breast cancers were found in women 18 to 49, according to results presented Monday at the Radiological Society of North America’s annual meeting in Chicago.

“This research shows that a significant proportion of cancers are diagnosed in women under 40, a group for whom there are no screening guidelines at this time,” researcher Dr. Stamatia Destounis , a

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