The latest U.S. estimates that more than half a million deaths from the disease have been avoided over the past three decades.
The Texas A&M Women's Basketball Team is preparing for their Annual Play 4 Kay Breast Cancer Awareness Game.
With several risk prediction models in development, it is also hoped that the inclusion of information about small genetic changes that increase breast cancer risk (known as SNPs) and women's breast density could in future help give an even more accurate estimation of breast cancer risk - and could help adapt the NHS Breast Screening Programme to offer more targeted, "risk-stratified" screening.
Researchers tracked 1990-2015 US data on breast cancer deaths, along with general data, on women aged 40 to 84.
Thirty four United Kingdom screening centres took part in the trial, finding that mammograms for women from 35 to 39 with a moderate or high risk of breast cancer were able to detect tumours at a significantly smaller size compared to those found in women screened later in life.
Cumulative breast cancer deaths averted from 1990 to 2015 ranged from more than 305,000 women to more than 483,000 women depending on different background mortality assumptions. In unscreened women, just 45% (131/293) of breast cancers were detected when the tumour was 2cm or smaller in size and 54% (158/290) of cases had already spread to the lymph nodes.
The women were all aged 35 to 39 and at moderate or high risk of breast cancer due to their family history, such as a mother or sister having the disease at a young age.
The report's lead author Professor Gareth Evans said the results of the new trial are "very promising".
However, only about half of women over 40 get regular mammograms. More cancers had spread to the lymphatic system.
"Over 335,000 women were diagnosed with new breast cancer in the United States in 2018", she noted, and "eight out of ten of these women have no family history of breast cancer".
He said more research is now needed to determine the impact of this screening on women's overall survival.
The charity's chief executive, Baroness Delyth Morgan said that earlier tests could prove to be "an enormous breakthrough".
An NHS England spokeswoman said an upcoming review by Professor Mike Richards will consider changes to the screening programme.