Retrospective Analysis of Blood Inflammatory Biomarkers in Patients with Oral Lichen Planus: Neutrophil-to-Lymphocyte Ratio and Platelet-to-Lymphocyte Ratio

Objectives: Oral lichen planus (OLP) is a potentially malignant disorder and a chronic inflammatory condition of an immune nature. The aim of this study was to investigate the association between immune-inflammatory biomarkers in patients with OLP and a control group. Materials and Methods: This was a retrospective study with 129 patients (62 with OLP and 67 controls) in which clinical and laboratory data were analyzed. The neutrophil-to-lymphocyte ratio (NLR), the platelet-to-lymphocyte ratio (PLR), the mean platelet volume (MPV) index, and the parameter of systemic immune-inflammation index (SII) were assessed. Results: In patients with OLP, the average time of progression was significantly longer when the condition manifested in the atrophic-erosive form (4.3 +/- 3.2 years) as opposed to the reticular form (1.8 +/- 0.9 years) (p = 0.018). With regard to NLR, no differences were found in terms of age (p = 0.346 (r = 0.08)), tobacco use (p = 0.807), sex (p = 0.088), alcohol consumption (p = 0.281), clinical form of OLP (p = 0.55), time of progression of OLP (p = 0.309 (r = -0.13)), and number of sites (p = 0.217). The same was observed for the systemic immune-inflammation index. Conclusion: The lack of significant statistical associations between the biomarkers and parameters (NLR, PLR, MPV, and SII index) in patients with oral lichen planus makes such parameters of very limited use in clinical OLP practice.