Safety and effectiveness of tofacitinib in Korean adult patients with ulcerative colitis: post-marketing surveillance study.

Background: Tofacitinib is an oral Janus kinase inhibitor for the treatment of ulcerative colitis (UC). We aimed to identify the safety and effectiveness of tofacitinib in patients with UC in routine clinical settings in Korea.

Methods: This open-label, observational, prospective, post-marketing surveillance study was conducted at 22 hospitals in the Republic of Korea.