Additionally, a study by Caetano et al. [ 9], which examined and compared the relationship between podoplanin expression and epithelial cell proliferative activity in OKC and its counterpart, orthokeratinized odontogenic cyst, found an associationbetween the odontogenic cell proliferation index (Ki-67) and podoplanin expression. The gene discussed is PDPN; the disease is odontogenic cyst.