Clinical characteristics and social productivity levels of patients with malignant rheumatoid arthritis based on a nationwide clinical database in Japan: annual survey from 2003 to 2013

Malignant rheumatoid arthritis (MRA) is defined as rheumatoid arthritis (RA) with systemic vasculitis or other severe extra-articular manifestations. Japan has a nationwide database for MRA. We analyzed the characteristics of Japanese patients with MRA based on data from the Ministry of Health, Labour and Welfare (MHLW).We were permitted to use data on 43,108 patients who were registered in the MHLW database from 2003 to 2013.Median age was 65...