CCND1 and oral lichen planus: Probably, the upregulation of the CCND1 gene with overexpression of its cyclin D1 protein is also relevant as an oncogenic mechanism, since it is a tributary gene of several pro-proliferative pathways [148,149,150,151,152], although research in this aspect is limited and only relies on two primary-level studies that report CCND1/cyclin D1 activation in 69.23% of OLP cases.