@article {Foti1229, author = {Robert S. Foti and Deepak K. Dalvie}, title = {Cytochrome P450 and Non{\textendash}Cytochrome P450 Oxidative Metabolism: Contributions to the Pharmacokinetics, Safety, and Efficacy of Xenobiotics}, volume = {44}, number = {8}, pages = {1229--1245}, year = {2016}, doi = {10.1124/dmd.116.071753}, publisher = {American Society for Pharmacology and Experimental Therapeutics}, abstract = {The drug-metabolizing enzymes that contribute to the metabolism or bioactivation of a drug play a crucial role in defining the absorption, distribution, metabolism, and excretion properties of that drug. Although the overall effect of the cytochrome P450 (P450) family of drug-metabolizing enzymes in this capacity cannot be understated, advancements in the field of non-P450{\textendash}mediated metabolism have garnered increasing attention in recent years. This is perhaps a direct result of our ability to systematically avoid P450 liabilities by introducing chemical moieties that are not susceptible to P450 metabolism but, as a result, may introduce key pharmacophores for other drug-metabolizing enzymes. Furthermore, the effects of both P450 and non-P450 metabolism at a drug{\textquoteright}s site of therapeutic action have also been subject to increased scrutiny. To this end, this Special Section on Emerging Novel Enzyme Pathways in Drug Metabolism will highlight a number of advancements that have recently been reported. The included articles support the important role of non-P450 enzymes in the clearance pathways of U.S. Food and Drug Administration{\textendash}approved drugs over the past 10 years. Specific examples will detail recent reports of aldehyde oxidase, flavin-containing monooxygenase, and other non-P450 pathways that contribute to the metabolic, pharmacokinetic, or pharmacodynamic properties of xenobiotic compounds. Collectively, this series of articles provides additional support for the role of non-P450{\textendash}mediated metabolic pathways that contribute to the absorption, distribution, metabolism, and excretion properties of current xenobiotics.}, issn = {0090-9556}, URL = {https://dmd.aspetjournals.org/content/44/8/1229}, eprint = {https://dmd.aspetjournals.org/content/44/8/1229.full.pdf}, journal = {Drug Metabolism and Disposition} }