Abstract:Objective To compare the effects of guselkumab and infliximab in treating severe plaque psoriasis.Methods A retrospective analysis was conducted on the medical records of 126 patients with severe plaque psoriasis who received targeted immunotherapy in our hospital from February 2022 to July 2023. Based on the treatment method, the patients were divided into a guselkumab group (64 cases) and an infliximab group (62 cases). The guselkumab group received subcutaneous injections of guselkumab for 44 consecutive weeks, while the infliximab group received intravenous infusions of infliximab for 46 consecutive weeks. The efficacy and adverse reactions of the two groups were evaluated, and comparisons were made regarding their Psoriasis Area and Severity Index (PASI) scores, Dermatology Life Quality Index (DLQI), and levels of interleukin (IL)-23, IL-17, and tumor necrosis factor (TNF)-α.Results The PASI and DLQI scores before treatment, 4 and 12 weeks after treatment, and at the end of the treatment were compared between the guselkumab group and the infliximab group, and the results showed that they were different among the time points (P < 0.05) and between the two groups (P < 0.05), and that the change trends of PASI and DLQI scores differed between the two groups (P < 0.05). The guselkumab group exhibited higher differences in levels of IL-23 and IL-17, and lower differences in levels of TNF-α compared to the infliximab group (P < 0.05). The treatment effectiveness of the guselkumab group was superior to that of the infliximab group (P < 0.05). The incidence of adverse reactions did not exhibit a statistically significant difference between the two groups (P > 0.05).Conclusions Compared to infliximab, guselkumab offers better clinical efficacy and safety in the treatment of severe plaque psoriasis.