The prespecified analysis, presented at the 2026 Fall Clinical Dermatology Conference in Las Vegas, provides new insights suggesting an immunometabolic relationship between psoriasis and obesity. These data showed that when Taltz and Zepbound were used together, changes were observed in more psoriasis disease-associated and metabolic biomarkers compared to Taltz monotherapy. In the U.S., approximately 61% of people with psoriasis also have obesity or overweight with at least one weight-related comorbidity.1

“People living with psoriasis and obesity carry a compounded burden that extends beyond what is visible, yet these conditions are too often viewed through separate treatment lenses,” said Mark Genovese, M.D., senior vice president of Lilly Immunology development. “The broader biomarker changes observed with Taltz and Zepbound, including those associated with skin clearance, may point to a meaningful relationship between immune and metabolic biology. Along with previously reported clinical outcomes, these findings support a more comprehensive approach to psoriasis care that also addresses obesity for people managing both conditions.”

This analysis examined circulating proteins and gene expression in the blood to better understand the biological change observed when patients were treated concomitantly with Taltz and Zepbound vs. Taltz alone. At Week 36, observed changes in psoriasis-specific, immune and metabolic biomarkers in both the Taltz and Zepbound and Taltz monotherapy treatment arms were consistent with the known biological effects of each medicine when used for their approved indications. Notably, Taltz and Zepbound used together were associated with broader biomarker responses compared to Taltz alone as early as Week 12. This included changes in more proteins (482 vs. 140 differentially expressed proteins) and genes (467 vs. 16 differentially expressed genes) by Week 36.

Further, the analysis showed greater reductions in inflammatory immune activity with Taltz and Zepbound compared with Taltz alone, including changes related to neutrophils, a type of immune cell involved in inflammation. Changes in a subset of neutrophil-associated markers mediated a portion of the additional Psoriasis Area and Severity Index (PASI) response seen with Taltz and Zepbound vs. Taltz alone.

“This analysis provides new insights into the potential connected immune and metabolic biology in people with psoriasis and obesity,” said James G. Krueger, M.D., Ph.D., Professor and Laboratory Head, The Rockefeller University. “What is most compelling is these findings identified differences in inflammatory pathways when patients received concomitant treatment with Taltz plus Zepbound for both conditions. These data at the intersection of psoriasis and obesity highlight immunometabolic health as an important area for continued scientific research.”

These data follow previously reported results from TOGETHER-PsO, which showed that Taltz and Zepbound used together delivered superior skin clearance and clinically meaningful weight reduction compared with Taltz alone at the Week 36 primary endpoint. Improvements were maintained or further improved through Week 52, with safety consistent with the known profile of each respective medicine.