Objective: To investigate the expression of c fos oncogene protein product in OSCC,para OSCC and it's role in the occurrence and development of OSCC.Methods:We employed immunohistochemical S P method to investigate the expression of c fos in 31 cases of OSCC, 23 cases of para OSCC, and compared them to normal tissues.Results: There was no expression of c fos in normal oral mucosa,but existed significant overexpression of c fos in OSCC and para OSCC.The positive rates in OSCC and in para OSCC were 5...