Předchozí léčbu PUVA, methotrexátem, cyklosporinem či acitretinem obdrželo 71, 4% pacientů, ačkoliv nebyli nutně na léčbu rezistentní.
Prior therapy with PUVA, methotrexate, cyclosporin, or acitretin had been received by 71.4% of patients, although they were not necessarily therapy resistant.