Four Principles to Consider Before Advising Women on Screening Mammography

Area of Science:

• Oncology
• Radiology
• Public Health

Background:

• Screening mammography is widely used for breast cancer detection.
• The benefits and harms of screening mammography require careful consideration for informed patient choice.

Purpose of the Study:

• To review key principles for evaluating screening mammography's efficacy and impact.
• To facilitate informed decision-making regarding screening mammography.

Main Methods:

• Review of four fundamental principles for assessing screening interventions.
• Analysis of statistical measures and biases in screening mammography data.
• Consideration of tumor biology in evaluating screening effectiveness.

Main Results:

• Screening mammography may not reduce advanced disease rates or mortality.
• Overdiagnosis leads to increased lumpectomy and mastectomy rates, offsetting potential benefits.
• All-cause mortality is a more reliable efficacy measure than disease-specific mortality.
• Lead-time and length biases affect survival time and early-stage tumor detection rates.
• Tumor biology influences the window for potential benefit from early detection.

Conclusions:

• Physicians should guide patients in making informed decisions about screening mammography.
• The potential harms of screening mammography, including overdiagnosis and overtreatment, must be weighed against uncertain benefits.
• Accurate assessment requires considering all-cause mortality, biases, and tumor biology.