Clinicopathological Features and Expression of Ki-67 in Odontogenic Keratocyst, Dentigerous Cyst and Radicular Cyst

Background: Biological behaviour of Odontogenic Keratocyst (OKC) is aggressiveness than others Odontogenic Cysts (OCs) like Dentigerous Cyst (DCs) and Periapical Cyst/Residual Cysts (RCs). The aim of the study was to determine clinicopathological features and expression of Ki-67 in Odontogenic Cysts of the oral cavity. Methodology: This cross-sectional study was conducted at de’Montmorency College of Dentistry (DCD from Feb, 2020 to Feb, 2022 after approval from Institutional Review Board (IRB) of DCD. A total 78 cases of OCs were collected from hospitals which are affiliated with the DCD. Routine lab process for Hematoxylin & Eosin and Immunohistochemistry was performed. Data entry and statistical analysis was carried out in SPSS 21. A Chi- square test was applied to observe the association between cyst and Ki-67. P value < 0.05 was taken as statistically significant.     Results: Among total 78 cases the mean age was 25.08 ±14.5 years with an age range of 6-70 years. Most OCs (64.1%) were reported in males than females (35.89%). Most OCs were reported in mandible (56.4%. Ki-67 expression in OKC was high 7.7%, low in 76.9% and negative in 15.4%). Most of the DCs and RCs expressed low expression of Ki-67 (84.6% and 76.9% respectively).   Conclusion: Most of the odontogenic cysts expressed low expression of Ki-67 while few cases of OKC and DC expressed high expression. Keywords: Dentigerous Cyst, Odontogenic Keratocyst, Immunohistochemistry, Ki-67, Odontogenic Cysts, Periapical Cyst, Radicular Cyst.