Key Summary
- Current NICE guidelines for women under 50 focus almost exclusively on family history, missing up to 95% of those who go on to develop breast cancer within a decade.
- Researchers identified eight times as many high-risk women in this age group.
- They noted that 73% of under-50s diagnosed with breast cancer have no family history of the disease.
The NHS criteria for identifying younger women at high risk of breast cancer are too narrow and miss up to 95% of under-50s who go on to develop the disease, researchers have warned.
Under current guidelines set by the National Institute for Health and Care Excellence (NICE), women under 50 in England do not receive routine NHS breast screening unless they have a known strong family history or specific inherited genetic risks.
However, a study published in the British Journal of Cancer by researchers at Cambridge University and the Institute of Cancer Research reveals that relying solely on family history leaves the vast majority of at-risk younger women undetected.
Early identification
The research team evaluated a comprehensive risk assessment calculator called Boadicea, which combines family history, lifestyle factors, reproductive history, and broad genetic markers to generate an individualised risk score.
The study estimated that if all women under 50 were assessed using Boadicea:
- Approximately 26.5% of under-50s would be identified as having an above-average risk and referred for specialist assessment.
- This higher-risk group would capture 34.8% of all women under 50 who go on to develop breast cancer within 10 years.
By contrast, existing NICE criteria result in just 1.4% of under-50s being referred for further assessment, capturing a mere 4.4% of those who subsequently develop the disease.
A major reason for this disparity, researchers explained, is that three-quarters (73%) of women under 50 who develop breast cancer within a decade have no family history of the condition.
NHS workload
Breast cancer remains a leading cause of death among women under 50 in the UK. While around 96% of cases occur in women over 40, younger women often face more aggressive diagnoses.
Lead researcher Dr Juliet Usher-Smith noted that while the NHS should review its criteria in light of the findings, referring significantly more women for screening would add to healthcare workloads and could cause unnecessary anxiety or false positives.
Dr Sowmiya Moorthie, from Cancer Research UK (which funded the study), said: "Any changes must be accessible and equitable, taking into consideration the anxiety that extra referrals might cause for women."
A spokesperson for NICE said: "NICE welcomes the findings and recognises the potential of multifactorial risk assessment tools, but current evidence does not warrant an immediate change to breast cancer screening guidelines."
The UK National Screening Committee regularly evaluates the NHS breast screening programme across all four nations.
Currently, routine mammogram invitations begin at age 50 every three years, balancing early detection against overdiagnosis and cost-effectiveness.
Health officials continue to encourage all women, regardless of age, to remain breast aware and see a GP promptly if they notice any unusual changes.
