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Correlate the Expression of the Markers CD44 & Bmi-1 and the Existence of Cancer Stem Cells in Oral Squamous Cell Carcinoma

ربط تعبيرية الواسمين Bmi-1 و CD 44 و تواجد الخلايا الجذعية السرطانية في السرطان شائك الخلايا الفموي

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 Publication date 2014
  fields Dentistry
and research's language is العربية
 Created by Shamra Editor




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Cancer stem cells in solid tumors are a "rare" group of cells and their role in carcinogenesis has been proven during the past few years. The pursuit for specific oral epithelial stem cell surface markers leads to the identification of markers such as CD44 and Bmi-1. The combination between CD44 which has been considered a potential prognostic marker for cancer stem cells in Head and Neck Squamous Cell Carcinoma (HNSCC), and Bmi-1 the pluripotency stemness marker may lead to identify the cells sharing the properties of both markers and could give a closer look into its appearance and density in the tissue. The aim of this study was to study the percent of cells stained positive for both markers and the histological grade of (HNSCC) and the anatomic location of the tumor. Statistical analysis showed that higher density of positive stained cells for both markers was in the severe grade of the tumor, whereas the second higher ratio was in the mild grade then the moderate , there was no significant association between the density of cells and the anatomical location. Our results suggest that the two markers together could be used as prognostic factors for patients with even mild grade SCC, which might help in prediction of recurrence.

References used
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Recombinant human bone morphogenetic protein-2 (rhBMP-2 ) is effectively to regenerate defects of the maxillary and mandible bones. Such defects are sometimes caused by resection of oral squamous cell carcinoma (OSCC) yet the biologic effects of rhBMP-2 on this malignancy and its histological relations and the ability of invasion and metastasis are not fully clear. Aim of the study : this study aimed to investigate the effects of rhBMP2 on E-cadherin expression , which plays a pivotal role in the cellular adhesion through the adherent junctions.
Background and Objective : Bone morphogenic protine-2 (BMP-2) plays an essential role in mesenchymal cells differentiation into osteoblasts، through many intracellular pathways which crosses with tumoral pathways . Oral squamous cell carcinoma is a n invasive epithelial neoplasm، counts more than 90% of head and neck malignancies. It is classified into three degrees according to the epithelial cells differentiation. The study aimed to investigate the changes in BMP-2 expression according to the histological degrees of the tumor. Materials and methods : In the present study، BMP-2 expression was compared immunohistochemically among oral squamous cell carcinoma in 27 cases (19 male+8 female) ranging between (22-74) years، mean age of (48) years. Patients have been divided into 3 groups (each contain 9 case) according to the histological grade. Results : By analyzing the statistical results, No significant correlation between BMP-2 expression and the histological grad was observed. The severity of expression was not affected by the tumour degree. Changes in membranous localization and intense cytoplasmic staining were also not observed. Conclusion : according to this study BMP-2 does not represent a prognostic marker for the histological grade of oral squamous cell carcinoma.
Background & Objective: This immunohistochemical study is to investigate the correlation between p53 & Ki67 and the grade of malignancy of squamous cell carcinoma, to estimate functional behavior of the cancerous cell by Ck17, and to compare the resu lts with the histological grading. Methods & Materials: 64 samples (biopsies) were chosen to check for p53, Ki67 & Ck17 at department of oral histology and pathology between 2002- 2009. Conclusion: There is a strong positive correlation between the degree of malignancy and the signs of cellular atypism (morphological changes) and the immunhistochemical positivity specially p53 and Ki67, and there is a strong negative correlation between the positivity of p53, Ki67 and the plasmolymphatic infiltrate. We must be sure of the correct diagnosis of squamous cell carcinoma by histological and immunohistochemical examination, and attention should be given to use more than one immune reactive.

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