Treating to target: Exploration of Investigator Global Assessment and body surface area (IGA×BSA) as a practical minimal disease activity goal

Objective: Psoriasis Area Severity Index (PASI) is typically used in clinical trials, but may not be pragmatic for use in clinical practice. The Investigator Global Assessment (IGA) and percentage of affected body surface area (BSA) are measures of psoriasis disease activity that are easily performed in routine clinical practice. This retrospective pooled analysis explored cutoff values of the product of IGA and BSA (IGA×BSA) that correlate with minimal disease activity (MDA) and would allow for a treat-to-target approach that may be feasible in clinical practice.

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