Health Panel Recommends Starting Mammograms at Age 40

Streamlining recommendations

If you’ve ever been confused on when to go in for your mammogram — an X-ray picture of the breast — you’re not alone. Before these new guidelines, the task force recommended that women at average risk for breast cancer get a mammogram every other year from age 50 to 74, and that women in their 40s should make a decision with their doctor.

Meanwhile, expert groups like the American Cancer Society and the American College of Radiology have said women at average risk for breast cancer should start screening in their 40s.

Streamlining the guidelines so that women know they should be going in for their first mammogram at age 40 helps to cut down on the confusion over when screening should begin, Omofoye says. However, the task force and other professional groups are still out of sync when it comes to how often women need a mammogram.

When the task force issued its draft screening recommendations in May 2023, the American Cancer Society released a statement applauding the updated recommendations to begin screening starting at age 40. “However, further consideration may be required as to the frequency of screening for women under age 55. Current evidence indicates that biennial [every-other-year] screening in this population is associated with a diagnosis of more advanced disease,” said William Dahut, M.D., chief scientific officer for the American Cancer Society.

Likewise, Jochelson says she “firmly believes” that women, and especially younger women, should be screened every year. “Again, younger women have more aggressive cancers. And you certainly don’t want to give a cancer two years to grow when you can find it a year earlier.”

The task force considers the potential harms and benefits of screening when making its recommendations and concluded that the best balance comes from screening every other year. An example of a potential harm is the risk of receiving a false positive, which can cause anxiety among patients called back for biopsies and more testing.

However, Omofoye says many women are willing to take that risk if it means catching cancer at a more treatable stage. “I think that the risk of a false positive versus the risk of a missed cancer are not equivalent,” she says.

Jochelson points out that the majority of breast imaging centers use 3-D mammography, and that this technology has been shown to reduce callback rates for women who don’t have cancer.

Talk to your doctor about risks

It’s important to note that with the updated guidelines, 40 is the latest age that women at average risk should start regular screenings for breast cancer. Some women, including those who have already had breast cancer or who are at high risk for it, are encouraged to start younger and screen more frequently.

If you have not had your risk for breast cancer assessed, talk to your doctor, Jochelson urges. You may be eligible for supplemental imaging. Plus, if it turns out you’re at high risk, you’ll want to inform others in your family that their risks could also be elevated, she adds.

The task force recommendations don’t include specific screening guidance for the roughly half of women in the U.S. who have dense breasts, which can increase breast cancer risks and interfere with mammogram readings.

“Women deserve to have the best science available to guide them on how to protect their health, and we’re asking the research community to prioritize studies that can show us how best to screen for breast cancer in women with dense breasts,” the task force’s Nicholson said in a statement. “In the meantime, women with dense breasts should talk with their clinician about options for follow-up testing so that they can get the care that’s right for them.”

Task force members are also calling for more research into the benefits and harms of screening in women 75 and older, and say that women in this age group should talk to their doctor about what’s best for them. The American Cancer Society recommends that women continue with mammograms if they are in good health and are expected to live at least 10 more years.

“For now, the most important thing for women to know is to begin screening at the age of 40, because it just might save your life,” says task force immediate past chair Carol Mangione, M.D., a professor of medicine and public health at the University of California, Los Angeles.