Objective To investigate the expressions of WW domain-containing oxidoreductase( WWOX) and multidrug resistance l( MDR1)genes in nasopharyngeal carcinoma tissues and the down regulation mechanism of WWOX gene. Methods The expressions of WWOX and MDR1 mRNA in nasopharyngeal tissues from 89 patients with nasopharyngeal carcinoma( experimental group) and 61 patients with chronic rhinitis( control group) were determined by real-time fluorescence PCR,and the down regulation mechanism of WWOX gene was investigate...