Two study cohorts will be defined by patients treated with secukinumab (Cohort 1), and patients treated with other indicated therapies (systemic, phototherapy, or biologic therapy; Cohort 2). Each investigator will recruit approximately the same number of patients in each treatment arm. 2,500 patients (1,250 patients in each cohort) will be followed over a period of 5 years from the Baseline assessment (Visit 1).