The stem cell code in oral epithelial tumorigenesis: 'the cancer stem cell shift hypothesis'

Area of Science:

• Oncology
• Cancer Biology
• Oral Pathology

Background:

• Oral tumors serve as a model for epithelial tumor progression.
• Cancer stem cells (CSCs) contribute to therapy resistance, recurrence, and metastasis.
• Identifying minimal residual disease (MRD) cells is difficult due to lack of distinct markers.

Purpose of the Study:

• To review evidence on identifying CSCs in oral squamous cell carcinoma (OSCC).
• To elucidate differential expression patterns of stem cell markers for MRD detection.
• To propose the "cancer stem cell shift hypothesis" for CSC identity and function.

Main Methods:

• Comparative phenotypic and genotypic studies.
• Analysis of normal oral mucosa and tumors of varying grades.
• Literature review of stem cell marker expression patterns.

Main Results:

• Differential expression of putative stem cell markers may identify MRD in OSCC.
• Evidence suggests a role for CSCs in tumor progression and recurrence.
• The "cancer stem cell shift hypothesis" offers a framework for understanding CSC behavior.

Conclusions:

• Stem cell markers hold potential for identifying minimal residual disease in oral cancer.
• Understanding CSCs is crucial for developing targeted therapies.
• The proposed hypothesis provides insights into CSC mechanisms and tumor staging correlation.