Serum levels of tumor necrosis factor-alpha in patients with psoriasis before, during and after narrow-band UVB phototherapy

Narrow-band UVB (NB-UVB) phototherapy is widely used worldwide for moderate and severe psoriasis, which is a chronic autoimmune inflammatory disease characterized by skin infiltrates of Th1-, Th17- and Th22-cells releasing locally pro- inflammatory cytokines. We investigate serum levels of tumor necrosis factor-α (TNF-α) in psoriatic patients before and after NB-UVB phototherapy.