PECAM1 and oral cavity squamous cell carcinoma: In a recent paper, Kämmerer et al. [55], reporting the association of T allele with oral squamous cell carcinoma, showed that VEGF-A rs3025039T allele seems to be associated with an increased CD31 immuno-stain, currently used for measurement of microvessel density (MVD) and endothelial cell kinetic in normal and pathological tissues.