Abstract
In head and neck clinical oncology, recurrent cancer after initial irradiation therapy is no longer sensitive to irradiation. To explore the irradiation resistance in head and neck squamous cell carcinoma, a human cell line, KB, derived from the floor of the oral cavity was used. The participation of the Fas-mediated apoptotic pathway was suggested by the upregulation of the surface Fas molecule, the reduction of the apoptotic cell fraction after inhibition of caspase 8 which is a Fas-related initiator caspase, and the changes in Fas-related genes after irradiation. Therefore, it is suggested that disruption of the Fas-mediated apoptotic pathway participates in the acquisition of irradiation-resistance in HNSCC.
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