Abstract:Objective To evaluate the efficacy of etanercept in the treatment of psoriasis vulgaris, to analyze the changes of PLT, MPV, PDW levels before and after treatment, and to investigate the correlation between the average platelet volume (MPV) and PASI score of patients with psoriasis vulgaris. Methods The experimental group had been received treatment of etanercept for 24 weeks. Before, during and after treatment, blood tests and PASI score were carried out, and the results of the three times were compared. The correlation between MPV and PASI was analyzed by Pearson method. Results After treatment of etanercept, the levels of PLT, MPV and PDW were significantly different with those before treatment (P?0.05). The change of MPV and PASI showed a positive correlation (r?=?0.147, P?=?0.030). Conclusion Etanercept is effective in the treatment of psoriasis vulgaris. MPV level can be considered as a clinical assessment index for the severity and treatment efficacy of psoriatic lesions.