Up to one in four breast cancers strike before age 50 — and that’s raising tough questions about when screening should really start.
A new study presented at the Radiological Society of North America’s annual meeting has found that as many as 25% of breast cancer cases occur in women younger than 50. Across seven outpatient clinics in the New York region, between 20% and 24% of diagnosed breast cancers were found in women aged 18 to 49.
Dr. Stamatia Destounis, a radiologist with Elizabeth Wende Breast Care in Rochester, New York, explained that the data reveal a significant number of breast cancer cases in women under 40 — a group currently not covered by standard screening guidelines. “Right now, no official screening recommendations exist for women under 40,” she said, “and yet, we’re seeing a substantial and concerning number of diagnoses in this age group.”
The U.S. Preventive Services Task Force currently advises women to have mammograms every two years between the ages of 40 and 74. Meanwhile, the American Cancer Society suggests annual screening beginning at 45, though it notes that women as young as 40 can choose to start earlier.
Researchers analyzed data from 2014 through 2024, examining nearly 1,800 diagnosed breast cancers in around 1,300 women under 50 at Elizabeth Wende Breast Care’s seven centers, which span a 200-mile area in western New York. Alarmingly, 81% of the cancers detected were invasive — meaning they had the potential to spread beyond the breast.
“Many of these tumors were aggressive, especially those in women under 40,” said Destounis. “Some were triple-negative — a difficult-to-treat form of breast cancer that doesn’t respond to hormone-based therapies.” Even in years when fewer younger women were screened, their share of diagnoses stayed constant, roughly one in every four cases.
Here’s where it gets controversial: Destounis argues that this stable yet aggressive trend challenges the long-held age-based screening cutoffs. “Younger women consistently account for a significant portion of breast cancers,” she said. “Their tumors tend to be more biologically aggressive. Ignoring that pattern risks missing cancers that could be caught earlier with more individualized screening.”
She emphasized the need for more personalized screening plans. Women under 50 — especially those under 40 or with risk factors such as family history, genetic mutations, or belonging to certain racial or ethnic groups — should not be automatically considered low-risk. Instead, Destounis suggests early education on self-checks and risk assessments focused on personal and family health histories.
“We can’t rely on age alone to guide screening,” she warned. “By paying closer attention to personal risk profiles, we can detect these cancers at an earlier and potentially more treatable stage.”
While these results are promising, experts note that findings presented at conferences should be considered preliminary until published in a peer-reviewed medical journal.
For more information on current breast cancer screening guidelines, visit the U.S. Centers for Disease Control and Prevention at https://www.cdc.gov/breast-cancer/screening/index.html.
What do you think — should breast cancer screening start earlier for high-risk women, or does earlier testing risk causing unnecessary anxiety and overtreatment? Share your thoughts below.
