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lüll Molecular biology of squamous cell carcinoma of the head and neck Perez-Ordonez B; Beauchemin M; Jordan RCJ Clin Pathol 2006[May]; 59 (5): 445-53Squamous cell carcinoma of the head and neck (HNSCC) is a heterogeneous but largely preventable disease with complex molecular abnormalities. It arises from a premalignant progenitor followed by outgrowth of clonal populations associated with cumulative genetic alterations and phenotypic progression to invasive malignancy. These genetic alterations result in inactivation of multiple tumour suppressor genes and activation of proto-oncogenes, including p16(ink4A), p53, cyclin D1, p14(ARF), FHIT, RASSF1A, epidermal growth factor receptor (EGFR), and Rb. Intramucosal migration and clonal expansion of transformed cells with formation of abnormal genetic fields appear to be responsible for local recurrences and development of second primary tumours.|Carcinoma, Squamous Cell/*genetics/pathology/virology[MESH]|DNA Fingerprinting[MESH]|Disease Progression[MESH]|Gene Deletion[MESH]|Genes, Tumor Suppressor[MESH]|Head and Neck Neoplasms/*genetics/pathology[MESH]|Humans[MESH]|Papillomavirus Infections/complications[MESH]|Risk[MESH] |