CYP2C9 and toxic epidermal necrolysis: The carrier rate of the CYP2C9*3 in this study was higher in the cADRs (12/103; 11.65%), which were 22.73% of SJS/TEN (5/22), 12.50% of DRESS (5/40) and 4.89% of MPE (2/41) group than in the tolerant control group (6/105; 5.71%).