Cytochrome P450 polymorphisms and drug-induced interstitial lung disease.

INTRODUCTION: With an increasing number of therapeutic drugs available for use, the list of drugs that are responsible for severe pulmonary disease also grows. Genetic polymorphism of drug-metabolizing enzymes, particularly of the cytochrome P450 superfamily of enzymes, influences individual drug efficacy and safety through the alteration of pharmacokinetics and disposition of drugs. AREAS COVERED: This review focuses on drug-induced interstitial lung disease, describes common patterns of pulmonary injury, discusses diagnosis and treatment, and details the prevalence and clinical significance of cytochrome P450 polymorphisms. EXPERT OPINION: Polymorphisms of cytochrome P450 genes can influence the metabolic activity of the subsequent enzymes, which in turn may lead to localized reactions and tissue damage, for example, in lung tissue. Pharmacogenomic techniques allow efficient analysis of risk factors and genotyping tests have the potential to optimize drug therapy. In the future, genotyping should be considered to identify patients who are at high risk of severe toxic responses in order to guide appropriate individual dosage.