When new breast cancer screening guidance landed last month, it did not quietly settle into clinical journals. Instead, it has prompted doctors who diagnose and treat the disease every day to speak out.

The American College of Physicians (ACP) now recommends that asymptomatic, average‑risk women begin routine mammograms at age 50 and receive them every two years. For women aged 40 to 49, the guidance urges individualized decision‑making with clinicians rather than automatic screening.

For several breast oncologists, that advice feels dangerously out of step with what they are seeing inside exam rooms.

Amani Jambhekar, a breast and melanoma surgical oncologist in Delaware, was blunt when the guidance was released.

“Please ignore the new American College of Physicians guidelines,” she wrote in a post that drew thousands of interactions. “We know mammograms save lives and yearly mammograms matter starting at the age of 40.”

Jambhekar said her reaction was rooted in her personal experience, seeing that patients who delay screening before diagnosis that are harder to treat.

“I can’t tell you how many patients I’ve seen who decided to wait two or three years, then on their first mammogram they’re diagnosed with a cancer that probably would have been caught a lot sooner,” she told Newsweek.

Ann Chuang, a breast surgical oncologist, had a similar response when she read the recommendations.

“I do not like them,” she told Newsweek. “A lot of the other societies start screening at 40.”

Chuang said she regularly diagnoses younger patients whose cancers were not flagged by symptoms or self‑exams, but appeared on imaging.

“All the people I usually diagnose with breast cancer in their 30s, they find it on self-exam because they’re not getting screening since they aren’t 40 yet,” she said. For women over 40, she added, screening matters precisely because early disease is silent. “Early breast cancer, there are no symptoms. You can only be seen on mammogram.”

In South Texas, Lisa Chapa views the guidance through a different, deeply local lens. She practices a short drive from the U.S.–Mexico border, in a region where poverty, lack of insurance and limited access to care already shape health outcomes.

“I was really disappointed to hear these guidelines,” she told Newsweek. “They feel irresponsible to me.”

Chapa said the recommendations ignore epidemiology in communities like hers. “What we know is that a third of all diagnosed Latino breast cancers happen younger than 50,” she said. “So these guidelines really forget and push to the side a big group of people.”

What the ACP Guidelines Say—and Who They Apply To

ACP says its guidance was developed precisely because screening recommendations have grown fractured and confusing.

“This guidance statement was developed to update ACP’s 2019 guidance statement on screening for breast cancer,” Carolyn J. Crandall of ACP’s Clinical Guidelines Committee told Newsweek. “The goal is to help clinicians provide the best evidence‑based care to their patients with consideration of the balance of benefits and harms, risk of breast cancer and the patients’ values and preferences.”

Crandall emphasized that the guidance applies only to asymptomatic females at average risk—not people with symptoms, prior breast cancer, high‑risk lesions, genetic mutations such as BRCA1 or BRCA2, or a history of high‑dose chest radiation.

“This does not include females who have breast cancer symptoms or a higher risk for breast cancer,” she said.

Under the updated guidance, clinicians “should use biennial mammography” for average‑risk women aged 50 to 74, while women in their 40s are encouraged to weigh screening through shared decision‑making.

How To ‘Catch It Early’

Disagreement over breast cancer screening is not new. But several oncologists worry this guidance lands in a moment when public trust in medical advice is already fragile—and that nuance will be lost.

Jambhekar said she fears women may interpret the recommendations as a reason to opt out altogether, particularly if they are already anxious about mammograms or uncertain whom to trust.

She noted that the American College of Radiology, the Society of Breast Imaging and the National Comprehensive Cancer Network all continue to recommend annual screening starting at 40.

“I was concerned that people would see these guidelines and not see the other major organizations who have all said that screenings should start at 40,” she said.

Chapa echoed that concern, arguing that professional authority matters.

“The voices and leaders you need to pay attention to should be experts in that field, who spend their entire days treating that disease,” she said.

For Chuang, the debate ultimately comes down to what early detection changes.

“We do not need to lose a single person to breast cancer if we catch it early,” she said. “If we catch it early, the treatments are usually more localized treatment instead of the bigger treatments including chemotherapy.”

Why Mammograms Matter—Even if You Feel Fine

A major point of confusion for patients is whether self-exams can replace imaging. Self-exams can be important—especially for people who are not yet being screened—but they are not a substitute for mammography once routine imaging is recommended, they said.

Self-exams are “important for people who are before 40 who don’t qualify for screenings,” Chuang said, explaining that many younger patients discover a lump themselves because they are not receiving routine mammograms.

“All the people I usually diagnose with breast cancer in their 30s, they find it on self-exam because they’re not getting screening since they aren’t 40 yet,” she said.

But Chuang said the reason routine screening is recommended for older age groups is precisely because early cancers often show no signs.

“The reason we want screening for the women over 40 is because early breast cancer, there are no symptoms,” she said. “You can only be seen on mammogram.”

Jambhekar similarly emphasized that physical exams can miss early disease. “No one—not even an experienced cancer surgeon—can diagnose breast cancer by feel alone,” she said, adding that mammograms can detect changes that aren’t palpable during exams.

“The mammograms are what made really one of the biggest difference in terms of breast cancer survival,” Jambhekar said, by catching cancers earlier—often allowing for more limited treatment.

Navigating Conflicting Advice: What Women Can Do Now

ACP’s guidance highlights the importance of shared decision-making for women aged 40 to 49, advising patients to discuss personal risk, values and preferences with clinicians.

Jambhekar said she agrees that risk is not one-size-fits-all—but argued those conversations need to happen early and be grounded in a clear understanding of family history, breast density and other risk factors.

“If you’ve had an abnormal biopsy, a close family member with breast cancer, or dense breast tissue. These are the kinds of patients that need to be assessed by someone, it could be their primary care physician, the OBGYN, a medical oncologist or a surgical oncologist,” she said.

For Chuang, the stakes are simple: earlier detection can mean less intensive treatment—and fewer lives lost.

“We do not need to lose a single person to breast cancer if we catch it early,” she said. “If we catch it early, the treatments are usually more localized treatment instead of the bigger treatments including chemotherapy.”

Original source: US