Part 1Relapse language
In conditions that wax and wane, relapse usually means signs returned after remission or quiet disease.
Part 2Progression language
In other fields, progression means measured growth or worsening on a defined scale.
Part 3Why the distinction matters
Endpoints, visit schedules and rescue options can differ depending on which idea a study tracks.
Part 4Read the definition
Public listings and papers usually define the term in a methods or glossary section.
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