Older Breast Cancer Survivors Did as Well With Fewer Follow-Up Mammograms

CATEGORY: WOMEN’S HEALTH

Once breast cancer treatment ends, the follow-up mammogram becomes the appointment the year is built around. Does it really need to come every year? That question had never been settled by a proper trial. So UK researchers ran one, in 5,235 women aged 50 or older who’d stayed cancer-free for three years after surgery. Scans every two or three years gave up nothing the trial could detect: five years in, 98.3% of women on the stretched schedule hadn’t died of breast cancer, beside 98.1% of women scanned annually.¹

One Schedule Drawn by Lottery

The trial, called Mammo-50, ran at 114 NHS hospitals. Half the women kept annual mammograms. The other half moved to a scan every two years if they’d had breast-conserving surgery, where only the tumor and a margin around it are removed, or every three years if they’d had a mastectomy, the removal of the whole breast. Nobody picked her own schedule. A random draw did, which is what makes the two groups comparable straight across. Researchers then followed both for a median of 5.7 years, counting recurrences, new tumors and deaths through hospital records.

Ninety-Eight Percent Either Way

The trial was built to rule out one specific worry: that stretched-out scans would cost more than 3 percentage points of breast cancer survival at five years. The gap it found was a tiny fraction of that, and it ran in neither direction you could call meaningful. Survival from breast cancer was 98.1% with annual scans and 98.3% with fewer, which works out to 61 and 55 breast cancer deaths. Overall survival landed at 94.7% and 94.5%. The share of women still free of any recurrence was 94.1% and 94.5%. However you slice the records, the yearly appointments didn’t buy extra protection.

Most Recurrences Didn’t Wait for a Scan

Here’s the detail that explains why. Of the 345 breast cancer events recorded in the trial, about two thirds came to light between scheduled scans, when a woman noticed a change and sought care, not on a surveillance image. That held in both groups: 108 of 175 events in the annual arm, 116 of 170 in the other. A scan that comes once a year still leaves most of the year uncovered. The authors concluded that less frequent mammography should be considered for women like these. The boundaries matter, though. This was surveillance after treated breast cancer, not routine screening for women who’ve never had it. It says nothing about survivors under 50, about the first three years after surgery, or about anyone whose cancer has already come back.

Key Takeaways

• The result covers women 50 or older who’d stayed cancer-free for three years after curative surgery. It doesn’t speak to routine screening, younger survivors, or the first three years of follow-up.
• Five-year survival from breast cancer was 98.1% with annual mammograms and 98.3% with scans every two or three years, meaning 61 and 55 deaths.
• About two thirds of recurrences and new tumors were found between scans, after symptoms appeared, whichever schedule a woman was on.
• The evidence is strong for this question: a randomized comparison in 5,235 women at 114 hospitals, with survival tracked for nearly six years.

References

1. Dunn JA, Donnelly P, Elbeltagi N, et al. Annual versus less frequent mammographic surveillance in people with breast cancer aged 50 years and older in the UK (Mammo-50): a multicentre, randomised, phase 3, non-inferiority trial. The Lancet. 2025;405(10476):396–407. link