CHICAGO—The American Cancer Society now says women should start mammograms later in life and get fewer of them—a stance that puts the trusted group closer to an influential government task force’s advice.
In new guidelines out Tuesday, the cancer society recommends most women should begin annual screening for breast cancer at age 45 instead of 40, and switch to every other year at 55.
The task force advises screening every other year starting at age 50.
It’s not a one-size-fits-all recommendation; both groups say women’s preferences for when to be scanned should be considered.
The advice is for women at average risk for breast cancer.
Doctors generally recommend more intensive screening for higher-risk women, including those with specific genetic mutations.
“The most important message of all is that a mammogram is the most effective thing that a woman can do to reduce her chance of dying from breast cancer,” said Dr. Richard Wender, the cancer society’s cancer control chief.
“It’s not that mammograms are ineffective in younger women,” he said, but at age 40, breast cancer is uncommon and false alarms are more likely.
Concern about false alarms contributed to the cancer society’s new guidance.
These lead to worry and more testing (they mean an initial result was suspicious but that cancer was ruled out by additional scans and sometimes biopsies).
The latest guidelines acknowledge some younger women are willing to accept that and that for them, starting annual exams at age 40 is fine as long as they know the risks.
The guidelines were developed by experts who reviewed dozens of studies, including research published since 1997—the year the cancer group recommended yearly mammograms starting at age 40—and since 2003, when it stopped recommending monthly breast self-exams.
The update recommends that women continue getting screened as long as they are in good health and have a life expectancy of at least 10 years.
The cancer group also dropped a recommendation for routine physical breast exams by doctors, saying there’s no evidence that these save lives.
The Rev. Jennifer Munroe-Nathans, 46, a pastor in Millis, Mass., said she hasn’t paid attention to guidelines and started getting annual scans around age 40 on her doctor’s advice.
And she has no plans to change course when she gets older.
“For my own peace of mind, I intend to continue yearly mammograms,” Munroe-Nathans noted.
“I’ve seen the impact of breast cancer—perhaps that makes me a little more hyper-vigilant.”
The society’s updated guidelines say switching to every other year at age 55 makes sense because tumors in women after menopause tend to grow more slowly.
Also, older women’s breasts usually are less dense so cancer is more visible on mammograms, said Dr. Kevin Oeffinger, chairman of the society’s breast cancer guideline panel and director of the cancer survivorship centre at Memorial Sloan Kettering Cancer Center in New York.