| Summary: | Context (Background): Stem cells are a unique subpopulation of cells in the human body with a capacity to initiate differentiation into various cell lines. Tumor stem cells (TSCs) are a unique subpopulation of cells that possess the ability to initiate a neoplasm and sustain self-renewal. Epithelial stem cell (ESC) markers such as octamer-binding transcription factor 4 (OCT4) and sex-determining region Y (SRY)-box 2 (SOX2) are capable of identifying these stem cells expressed during the early stages of tooth development. Aims: To detect the expression of the stem cell markers OCT4 and SOX2 in the normal odontogenic tissues and the odontogenic cysts and tumors. Materials and Methods: Paraffin sections of follicular tissue, radicular cyst, dentigerous cyst, odontogenic keratocyst, ameloblastoma, adenomatoid odontogenic tumor, and ameloblastic carcinoma were obtained from the archives. The sections were subjected to immunohistochemical assay by the use of mouse monoclonal antibodies to OCT4 and SOX2. Statistical Analysis: The results were evaluated by descriptive analysis. Results: The results show the presence of stem cells in the normal and lesional tissues with these stem cell identifying markers. SOX2 was found to be more consistent and reliable in the detection of stem cells. Conclusion: The stem cell expressions are maintained in the tumor transformation of tissue and probably suggest that there is no phenotypic change of stem cells in progression from normal embryonic state to its tumor component. The quantification and localization reveals interesting trends that indicate the probable role of the cells in the pathogenesis of the lesions.
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