The Authors report the results of a multicenter retrospective study on 32 patients with moderate-to-severe psoriasis switched from ustekinumab to guselkumab, after failure in achieving minimal disease activity 2 within 52 weeks of therapy with the former.Herein, we report our real-life experience with a similarly sized, single-center retrospective cohort, consisting of 30 patients with moderate-to-severe psoriasis switching from ustekinumab to guselkumab.The switch was proposed to patients meeting the following inclusion criteria: significant residual Psoriasis Area and Severity Index (PASI) (i.e., failed PASI75), patient-reported dissatisfaction or residual disease in sensitive areas (e.g., face, scalp, palms, soles, and genitals) despite weight-appropriate treatment with ustekinumab for at least 6 months. Need for dose intensification or escalation to dosing every 8 weeks was considered as an adjunctive inclusion criterion.Patients' characteristics, including demographics, comorbidities, previous treatments, and clinical features are summarized in Table 1.At the baseline, a slight male sex preference (M:F = 3.9:1 vs. 1.5:1), greater representation of cardiovascular comorbidities (7/30 [23.3%] vs. 3/32 [9.3%]) and history of previous treatment with IL-17 inhibitors (4/30 [13.3%] vs. 0) were noted in our cohort. Twenty-nine, 25, and 22 patients reached weeks 12, 24, and 52 of therapy, respectively, counting from the time of switching. Although mean PASI at the time of switching was similar across the two studies (6.45 vs. 7.4), the proportion of patients achieving PASI <1 was lower than that reported by Magdaleno-Tapial et al. both at week 12 (45% vs. 82%), at week 24 (56% vs. 87%) and at week 52 (50% vs. 100%). Nevertheless, the therapeutic target of PASI 75 was achieved by 55% of patients at week 12, by 72% of patients at week 24 and by 82% of patients at week 52; whereas the PASI 90 target Mean duration of ustekinumab treatment (months), mean ± SD 50.4 ± 32.8Giulia Murgia and Carlo Alberto Maronese contributed equally and both qualify as first authors.