0311 GMT February 22, 2019
Breast Cancer Now funded a study which found cancers were detected sooner when 35 to 39-year-olds at risk had annual mammograms, BBC reported.
NHS (the national health service) screening often starts at the age of 40 for women with a family history.
Experts need to balance the benefits of doing more checks against causing any undue worry or over-treatment.
The study's authors said that more analysis was needed on the risks, costs and benefits of extending the screening program.
But Baroness Delyth Morgan, the charity's chief executive, called for the government's forthcoming review of NHS screening programs in England to consider the introduction of scans for women aged 35 to 39 with a family history of breast cancer.
The study, carried out by researchers at the University of Manchester, offered scans to 2,899 women in this age group who were deemed to have a moderate or high risk of the disease after being referred by a GP to a family history clinic.
The screening detected 35 invasive breast cancer tumors, most of which were small and identified before they had reached the lymph nodes — a sign that they had not spread around the body.
In a control group, which did not have the screening, far fewer of the cancers were discovered when they were still small and more had spread to the lymphatic system.
Professor Gareth Evans, the lead author of the study, said the trial demonstrates that annual scans are effective in detecting tumors earlier for this younger age group.
He said over diagnosis — where people are treated for cancers that are unlikely to prove harmful — was ‘far less likely’ to be an issue with this younger age group.
"For women with a family history, removing a non-invasive tumor so early in their lives is likely to be a cancer preventive," Evans said.
The study did not include women who had specific gene mutations which can increase the risk of the disease.
The charity said regular MRI scans — as is currently recommended — remains the best option for those with faulty BRCA or TP53 genes.
Lives cut 'heartbreakingly short'
If annual mammograms for at risk younger women were made widely available across all four of the UK's NHS services, it could affect up to 86,000 women, the researchers said.
Breast cancer is the most common cancer in the UK, with about 55,000 women being diagnosed each year and 11,500 dying from the disease.
Between five percent and 15 percent of breast cancers are linked to a family history of the illness.
"We've long known that a family history can define a woman's risk, and that breast cancer can be more aggressive in younger women," said Morgan.
"So if we can intervene earlier for those at higher risk through annual screening, we believe we may be able to stop the disease cutting so many women's lives so heartbreakingly short."
An NHS England spokeswoman said possible changes to the screening program will be considered in the review.
She said, "Breast cancer survival is at its highest ever and with improved screening a key focus of the NHS long-term plan, even more cancers will be diagnosed earlier."