Defining, Estimating, and Communicating Overdiagnosis in Cancer Screening

Area of Science:

• Medical Ethics
• Health Services Research
• Preventive Medicine

Background:

• Inadequate healthcare has known harms, but excessive medical interventions, including overdiagnosis, are increasingly recognized.
• Overdiagnosis is often confused with related concepts like overtreatment and false positives, making it difficult to measure.
• The U.S. Preventive Services Task Force (USPSTF) focuses on screening healthy individuals and has a vested interest in understanding screening-related harms, particularly overdiagnosis.

Purpose of the Study:

• To provide a clear definition of overdiagnosis in the context of cancer screening.
• To guide the estimation of overdiagnosis rates and their associated harms.
• To improve the communication of overdiagnosis risks to stakeholders.

Main Methods:

• Literature review and synthesis of existing knowledge on overdiagnosis.
• Development of a specific definition for overdiagnosis in cancer screening.
• Exploration of various approaches for estimating overdiagnosis.

Main Results:

• Overdiagnosis is a distinct harm that requires careful definition and measurement.
• Variations in overdiagnosis estimates stem from differing methodologies and definitions.
• Best practices for communicating the potential harms of overdiagnosis are outlined.

Conclusions:

• A standardized definition and consistent estimation methods are crucial for understanding overdiagnosis.
• Clear communication strategies are needed to inform patients and clinicians about overdiagnosis risks.
• Addressing overdiagnosis is essential for optimizing the benefits of cancer screening.