PECAM-1 overexpression signifies aggressive biologic behavior of oral lichen planus - A pilot study.

The etiopathogenesis of oral lichen planus (OLP) is still debatable. According to literature, many studies have illustrated OLP as a T-cell-mediated chronic autoimmune disease. Currently, there is increased evidence of chronic inflammation in OLP and its association with vascular adhesion molecules (VAMs).The aim of this study was to evaluate the expression of VAM (PECAM-1) in OLP.Tissue samples involved 20 archival cases of histopathologically confirmed OLP (n = 15) and normal mucosa (n = 5) as controls.The sections were subjected to immunohistochemical analysis using antibody to PECAM-1. Brown staining of the endothelial cells of blood vessels was considered positive. The expression of PECAM-1 in OLP was statistically analyzed using Wilcoxon sign-rank test.The expression of PECAM-1 in OLP was statistically significant when compared with normal mucosa (P < 0.05). A statistically significant difference was also observed in PECAM-1 expression between the reticular type and erosive type of OLP.PECAM-1 was found to be overexpressed in OLP; difference in PECAM-1 expression was noted between the reticular and erosive types. The VAMs could be exploited as a possible therapeutic target in OLP to modulate the disease process thereby reducing the dependency on corticosteroids.