Tidligere behandling med PUVA, methotrexate, ciclosporin eller acitretin var modtaget af 71, 4% af patienterne, selv om de ikke nødvendigvis var behandlingsresistente.
Prior therapy with PUVA, methotrexate, cyclosporin, or acitretin had been received by 71.4% of patients, although they were not necessarily therapy resistant.