Clinical Effectiveness, Clinical Stability, and Effects on Serum Galectin-7 Levels of Dupilumab and JAK Inhibitors in Moderate-to-Severe Atopic Dermatitis: A Real-World, Single-Center Analysis

<i>Background and Objectives:</i> Several biologics and oral Janus kinase (JAK) inhibitors have been developed and shown in clinical trials and real-world studies to be effective and safe in moderate-to-severe atopic dermatitis (AD). In this study, we aimed to evaluate the real-world outcomes of patients with moderate-to-severe AD treated with dupilumab and JAK inhibitors in our facility, focusing on their short-term effect on serum galectin-7 levels, a biomarker reflecting skin barrier impairment, and one-year stability based on patient-oriented outcomes. <i>Materials and Methods:</i> In a single-center, retrospective study of AD patients treated with dupilumab or JAK inhibitors between January 2018 and December 2024, we assessed physician-oriented outcomes until 16 weeks and patient-oriented outcomes until 52 weeks. Serum galectin-7 levels at baseline and 4 and/or 16 weeks after treatment were measured in 14 patients. <i>Results:</i> A total of 45 patients starting dupilumab and 10 patients starting JAK inhibitors were enrolled. Percentage reductions in EASI scores from baseline at 4, 8, and 16 weeks were 58.36 ± 22.09, 69.59 ± 20.96, and 75.98 ± 19.70, with no significant differences between patients treated with dupilumab and JAK inhibitors. Serum galectin-7 levels were significantly reduced after treatment at 4 and 16 weeks in the entire population. Both DLQI and POEM scores were reduced at 4 weeks and gradually decreased until 52 weeks. The reduction was faster with JAK inhibitors than with dupilumab. Visits with unstable effectiveness, defined as a visit with a three-point or greater increase in the POEM score at 28, 40, and 52 weeks, were more frequent in JAK inhibitor patients. <i>Conclusions:</i> Both dupilumab and JAK inhibitors showed high effectiveness on skin inflammation and decreased a marker of skin barrier dysfunction within 16 weeks. JAK inhibitors improved patient-reported outcomes more quickly than dupilumab, but instability of effectiveness during 16 and 52 weeks was higher with JAK inhibitors.