“…Ustekinumab is a fully human monoclonal antibody, which has low immunogenicity, and reportedly shows effectiveness for Crohn's disease comparable to that of anti-TNF-alpha therapy [5]. Engel et al analyzed real-world ustekinumab usage in 578 patients and demonstrated clinical response rates of 60%, 62%, and 49% at 12, 24, and 52 weeks, respectively, a 1-year endoscopic response rate of 63%, serious AEs in 19 patients (3.2%), and infections in 38 patients (6%); none of their patients had tuberculosis [10]. Furthermore, a 5-year, long-term analysis of patients with psoriasis showed that serious drugrelated and other possible treatment-related AEs occurred in 9/774, 3/253, and 0/391 patients who received adalimumab, infliximab, and ustekinumab, respectively, indicating the latter to be safe [6].…”