Disease burden and treatment sequence of polymyositis and dermatomyositis patients in Japan: a real-world evidence study.

Introduction/objectives: Since new consensus on polymyositis (PM) and dermatomyositis (DM) were released in Japan, an updated evidence on treatment landscape and PM/DM burden was essential. This study evaluates treatment burden and overall treatment cost of PM/DM-related inpatient and outpatient visits, treatments, and procedures/patient/year.

Method: This retrospective, observational study analyzed insurance claims from Japan Medical Data Center (JMDC) database.