Epidemiological survey of patients with psoriatic arthritis in the Japanese Society for Psoriasis Research from 2017 to 2020

The Japanese Society for Psoriasis Research (JSPR) conducted annual epidemiological surveys of patients with psoriatic arthritis (PsA). This study aimed to analyze a recent epidemiological survey of enrolled PsA patients in the JSPR from 2017 to 2020. A total of 1641 patients (1032 men [62.9%] and 609 women [37.1%]) were enrolled from 131 medical institutions. The mean ± standard deviation age of the patients was 51.4 ± 13.6 years and those at the onset of skin lesions and joint symptoms were 39.2 ± 15.8 and 47.9 ± 14.0 years, respectively. According to the Moll and Wright criteria, distal, oligoarticular, polyarticular, arthritis mutilans, and axial or spondyloarthritis types were 27.2%, 29.9%, 18.6%, 0.4%, and 6.6%, respectively. Approximately 56.3% of the patients had past history and comorbidities, such as hypertension (35.9%), dyslipidemia (20.7%), diabetes mellitus (19.2%), hyperuricemia (13.5%), cardiovascular disease (4.1%), and cerebrovascular disease (3.9%). Regarding systemic therapy, 55.9% and 45.5% of the patients were treated with oral medications and biologics, respectively. The most common oral medication was methotrexate (39.1%), followed by apremilast (27.4%). Non‐steroidal anti‐inflammatory drugs were also used in many patients (40.3%). Among the biologics, the most common was adalimumab (30.1%), followed by secukinumab (20.9%) and ixekizumab (17.0%). This survey shows the recent perspective of PsA in the Japanese society, which will lead to a better understanding of this disease, including patient characteristics, comorbidities, and treatment trends.