Sex is a major determinant of CYP3A4 expression in human liver
Renzo Wolbold, Kathrin Klein, Oliver Burk, Andreas K. Nüssler, Peter Neuhaus, Michel Eichelbaum, Matthias Schwab, Ulrich M. Zanger – 7 March 2007 – Many drugs that are substrates of CYP3A4, the major human drug‐metabolizing cytochrome P450 (CYP), show higher clearance in women than in men. Although this effect is believed to be related to drug metabolism, the underlying cause has not been elucidated.