English version of Japanese guidance for biologics in treating atopic dermatitis.

This is the English version of the Japanese guidance for biologics in treating atopic dermatitis (AD). The signaling pathway mediated by interleukin (IL)-4 and IL-13 contributes to type 2 inflammatory responses and plays an important role in the pathogenesis of AD. IL-31 is a cytokine mainly produced by activated T cells and is known to be involved in the pruritus of AD. Biologics for AD have been approved, including dupilumab, an anti-IL-4 receptor α antibody that was approved for expanded use in AD in 2018. In 2022, nemolizumab, an anti-IL-31 receptor α antibody, was approved for pruritus of AD, and tralokinumab, an anti-IL-13 antibody, was approved for AD. Physicians who intend to use these drugs should sufficiently understand and comply with the contents of the guidelines prepared by the Japanese Ministry of Health, Labour, and Welfare to promote the optimal use of the drugs. In treatment with biologics, it is important to consider disease factors (activity and severity), treatment factors (dosage and administration as well as the efficacy and safety), and patients' background characteristics (age and comorbidities) and share this information with patients when choosing treatment options. This guidance was developed for board-certified dermatologists who specialize in treating AD, and for promoting the proper use of biologics, taking into account the variety of factors in individual patients.