Breast screening policy: are we heading in the right direction?

Area of Science:

• Oncology
• Radiology
• Public Health

Background:

• Evidence supports biennial mammographic screening for women aged 50-69.
• Mammography shows mortality reduction in women aged 40-49, but requires annual screening.
• Screening younger women presents specificity challenges and potential for over-diagnosis.

Purpose of the Study:

• To evaluate the evidence for extending mammographic screening age ranges.
• To assess the benefit-harm balance of current and proposed screening protocols.
• To inform policy decisions regarding mammography screening intervals and age eligibility.

Main Methods:

• Systematic review of randomized controlled trials and existing evidence on mammographic screening.
• Analysis of mortality reduction data across different age groups and screening intervals.
• Evaluation of over-diagnosis and over-treatment rates associated with screening.

Main Results:

• Biennial screening is supported for women 50-69 years.
• Annual screening is needed for mortality benefit in women 40-49 years, despite lower specificity.
• No evidence supports screening above 70 years due to increased harm from over-diagnosis and over-treatment.

Conclusions:

• Extending screening to women in their 40s requires multiple screenings and shorter intervals for proven mortality benefit.
• Screening women over 70 is not supported by evidence and may cause more harm than benefit.
• Policy decisions on age extension should be based on demonstrated mortality reduction and acceptable harm-benefit ratios, with resources potentially redirected to shorten screening intervals for the 50-69 age group.