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This study aimed to evaluate the efficacy of narrow-band ultraviolet B (NB-UVB) phototherapy, methotrexate, and combined NB-UVB phototherapy with methotrexate in the treatment of psoriasis vulgaris and to assess their effects on serum cathelicidin and vitamin D. This study was conducted on 60 patients with psoriasis vulgaris. They were divided into three groups (20 patients each); Group (A) was treated with NB-UVB phototherapy. Group (B) was treated with methotrexate. Group (C) was treated with combined NB-UVB phototherapy with methotrexate. Patients were assessed with Psoriasis Area and Severity Index (PASI score), serum cathelicidin and vitamin D at the first visit and after three months of treatments. The highest mean PASI score percent improvement was reported in the combined NB-UVB phototherapy with methotrexate (92%). There was a significant increase in serum vitamin D after treatments with NB-UVB phototherapy and combined NB-UVB phototherapy with methotrexate ( p  &lt; .001). There was a significant decrease in cathelicidin after three months of treatment with combined NB-UVB phototherapy with methotrexate ( p  &lt; .01). This study could contribute to the hypothesis considering the role of cathelicidin and vitamin D in the pathogenesis of psoriasis. The combined NB-UVB phototherapy with methotrexate had the highest clinical improvement of psoriasis vulgaris.

journal of dermatological treatment

Effect of narrow-band ultraviolet B phototherapy, methotrexate, and combined narrow-band ultraviolet B phototherapy with methotrexate on serum cathelicidin and vitamin D in patients with psoriasis vulgaris