- Patients who have received systemic medications or treatments that could affect psoriasis or PASI evaluation (including, but not limited to, oral or injectable corticosteroids, retinoids, 1,25 dihydroxy vitamin D3 and analogues, fumaric acid esters, psoralens, anti TNF (tumour necrosis factor) biologics, anti IL 12/23 biologics, or herbal treatments), within 5 half lives prior to Day 1 (4 weeks for oral anti psoriatics, 12 weeks for psoralens and PUVA (oral psoralen with ultraviolet A), and 24 weeks for biologics)