Objective:To investigate the expression of miR-155 in peripheral blood and tissues of oral lichen planus patients.Methods:Eighty-five oral lichen planus patients were selected.They were divided into non-erosive type(n=48)and erosive type(n=37),according to the different conditions of the base of mucosa of lesions.Forty healthy subjects and forty-five normal tissues were selected as control group.The expressions of miR-155 in plasma and mononuclear cells in patients and the control group were detected by rea...