Comparison of Secukinumab Versus Guselkumab in Clearing Psoriatic Plaques Refractory to Ustekinumab

Inclusion Criteria: Chronic plaque-type psoriasis considered inadequately controlled after treatment with ustekinumab according to the following criteria-: * Ustekinumab administered at a dose equal or higher than that on the label for at least 24 weeks. The last administration must be at least 12 weeks before randomization * absolute PASI score of 1-10 at Screening * Presence of at least 1 refractory skin plaque, defined by a TCS of at least 6 and severity score of at least 2 or 3 (moderate) for each individual item, with an area ≥ 10 cm2 at screening. Exclusion Criteria: * Forms of psoriasis other than chronic plaque-type (e.g., pustular, erythrodermic and guttate psoriasis) at Screening or Baseline * Drug-induced psoriasis (i.e., new onset or current exacerbation from beta-blockers, calcium channel inhibitors or lithium) at Baseline * Previous treatment with more than one TNFα inhibitor or with IL-17A (including secukinumab), IL-17R or IL-23 (including guselkumab) inhibitors * Use of other investigational drugs within 4 weeks before enrolment, or within a period of 5 half lives of enrollment/initiation of the study treatment, whichever is longer * Ongoing use of prohibited treatments (see Section 6.2.2) * Known immunosuppression (e.g., AIDS) at Screening