Real-World Efficacy and Safety of Dupilumab Use in Japanese Adult Patients with Atopic Dermatitis: A Single-Center, Retrospective, 104-Week, Observational Study

<b>Background/Objectives:</b> Dupilumab is an interlekin-4 receptor antibody that exerts its efficacy by inhibiting the signaling pathway of interleukin-4/interleukin-13, and it is currently used clinically as a highly potent therapeutic for atopic dermatitis. However, there have been few reports on the therapeutic effect of dupilumab using long-term real-world data. To accumulate further real-world data through long-term use of dupilumab, we performed a retrospective study on the courses of patients with atopic dermatitis who were treated with dupilumab for at least 104 weeks in our university hospital. <b>Methods:</b> We examined the treatment courses of 30 adult patients. <b>Results:</b> Subjective (e.g., itch visual analog scale and Dermatology Life Quality Index) and objective (e.g., Eczema Area and Severity Index) indices and some biomarkers showed improvements over time with dupilumab treatment, even in cases with poor early response to dupilumab treatment. As for the therapeutic effect on anatomical regions, although the therapeutic effect on the head and neck region was weak in the early stages, it improved over time, and at 104 weeks, it showed a therapeutic effect that was comparable to other regions. <b>Conclusions:</b> Therefore, our study demonstrated the advantages of prolonged administration of dupilumab in atopic dermatitis.