Accordingly, positive correlations were observed between VDR and miR-27a/b in oral epithelial cells obtained from OLP patients and controls (Fig. 6a,b [r = 0.7681, P = 0.0236, Spearman’s correlation test for miR-27a] and [r = 0.7282, P = 0.0417, Spearman’s correlation test for miR-27b]), and 25(OH)D and miR-27a/b in serum from participants also showed good correlations (Fig. 6c,d [r = 0.6605, P = 2.78 × 10−11, Spearman’s correlation test for miR-27a] and [r = 0.7305, P = 2.80 × 10−11, Spearman’s correlation test for miR-27b]). This evidence concerns the gene VDR and oral lichen planus.