Interleukin‐23 inhibitors decrease Fibrosis‐4 index in psoriasis patients with elevated Fibrosis‐4 index but not inteleukin‐17 inhibitors.

Recent studies indicate that hepatic diseases are associated with psoriasis. Non‐invasive tests, including the Fibrosis‐4 (FIB‐4) index, which can confidently rule out the presence of advanced fibrosis, are currently receiving attention. However, data on the FIB‐4 index in psoriasis patients and the effects of biologics on the FIB‐4 index are limited. We investigated the relationships between the FIB‐4 index and demographic or clinical characteristics as well as the effects of biologics on the FIB‐4 index in psoriasis patients. Psoriasis patients aged 36–64 years, whose treatment was initiated with interleukin (IL)‐17 inhibitors or IL‐23 inhibitors for psoriasis from May 2015 to December 2022, were consecutively included. Data were collected retrospectively from the patients' charts. A total of 171 psoriasis patients were included in this study. Thirty‐four, 43, 21, 32, and 41 psoriasis patients were treated with secukinumab, ixekizumab, brodalumab, guselkumab, or risankizumab, respectively. In biologics‐naïve patients, a significant but weak positive correlation was observed between the FIB‐4 index and age (r = 0.3246, p = 0.0018). There was no significant correlation between the FIB‐4 index and other demographic or clinical characteristics. Regarding the effects of biologics on the FIB‐4 index, no significant change was observed in psoriasis patients treated with any biologics. However, in psoriasis patients with a baseline FIB‐4 index of >1.3, patients treated with guselkumab and those treated with either IL‐23 inhibitor showed significantly decreased FIB‐4 index scores 6 months after initiating the biologics (p = 0.0323, p = 0.0212). In contrast, no change was observed in FIB‐4 index scores in patients treated with IL‐17 inhibitors. In conclusion, our study revealed that the FIB‐4 index was correlated with age in psoriasis patients. Furthermore, IL‐23 inhibitors (but not IL‐17 inhibitors) decreased the FIB‐4 index score at 6 months in psoriasis patients with elevated FIB‐4 index scores at baseline. Further studies are needed to clarify whether IL‐23 inhibitors improve liver fibrosis physiologically and functionally. [ABSTRACT FROM AUTHOR]