stage migration

Full Definition

Stage migration, also known as the Will Rogers phenomenon, occurs when screening programs detect cancers at earlier stages than would occur through clinical presentation, creating an apparent improvement in stage-specific survival rates. This phenomenon can make screening appear more beneficial than it actually is, because earlier-stage cancers naturally have better prognoses. True screening benefit requires demonstration of reduced overall cancer mortality, not just improved stage distribution or stage-specific survival.

Usage

Usage note: Also known as Will Rogers phenomenon; specify which term is preferred.

In Context

• "The improved survival rates may reflect stage migration rather than genuine screening benefit." — Research interpretation
• "Investigators controlled for stage migration by examining overall mortality rather than stage-specific outcomes." — Study methodology