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Abstract
Because CD9 is implicated in cell growth, cell adhesion and cell motility, altered CD9 expression might be involved in cancer invasion and metastasis. We have studied the immunolocalization of CD9 in oral squamous cell carcinoma (SCC). Sections prepared from paraffin-embedded specimens from patients with SCC of the oral cavity were stained with a monoclonal anti-CD9 antibody by means of the streptoavidin biotin method. Significant reduction or complete loss of CD9 expression was observed in cancer cells at the periphery of the cancer nests in the advancing front of invading tumor. Among 78 cases of oral SCCs examined, 46 (59.0%) cases were completely negative for CD9 expression. Loss of CD9 expression in cancer tissue strongly correlated with a high incidence of cervical lymph node metastasis and poorer prognosis (P=0.001). Thus a close examination of CD9 in SCC tissue would be useful for the prognosis of patients with oral carcinoma.
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