Tamoxifen Therapy and CYP2D6 Genotype
نویسنده
چکیده
The CYP2D6 enzyme metabolizes a quarter of all prescribed drugs, and is one of the main enzymes responsible for converting tamoxifen into its active metabolites. Individuals who carry two nonfunctioning copies of CYP2D6 are known as poor metabolizers. Individuals who carry one or two decreased activity alleles are referred to as intermediate metabolizers. Importantly, there are also heterozygous individuals who carry one inactive or decreased function allele in combination with a functional allele. These individuals have decreased CYP2D6 activity and for simplicity are frequently included in the “intermediate metabolizer group”. Individuals with decreased capacity to metabolize tamoxifen may benefit less from tamoxifen therapy.
منابع مشابه
CYP2D6 genotype, antidepressant use, and tamoxifen metabolism during adjuvant breast cancer treatment.
BACKGROUND The efficacy of tamoxifen therapy for the treatment of breast cancer varies widely among individuals. Plasma concentrations of the active tamoxifen metabolite endoxifen are associated with the cytochrome P450 (CYP) 2D6 genotype. We examined the effects of concomitant use of selective serotonin reuptake inhibitor antidepressants, which are CYP2D6 enzyme inhibitors commonly prescribed ...
متن کاملCYP2D6 polymorphisms influence the efficacy of adjuvant tamoxifen in Thai breast cancer patients
AIM We evaluated single nucleotide polymorphisms (SNPs) of CYP2D6 to identify those that influence the efficiency of tamoxifen in adjuvant treatment of breast cancer through a matched case-control study. METHODS Peripheral blood DNA was collected from 20 patients with disease recurrence during adjuvant tamoxifen treatment and from 19 patients who had completed 5 years of tamoxifen therapy wit...
متن کاملPersonalized Medicine and Imaging Significant Effect of Polymorphisms in CYP2D6 on Response to Tamoxifen Therapy for Breast Cancer: A Prospective Multicenter Study
Purpose: CYP2D6 is the key enzyme responsible for the generation of the potent active metabolite of tamoxifen, "endoxifen." There are still controversial reports questioning the association between CYP2D6 genotype and tamoxifen efficacy. Hence, we performed a prospective multicenter study to evaluate the clinical effect of CYP2D6 genotype on tamoxifen therapy. Experimental Design:We enrolled 27...
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Donald Berry in his recent editorial (1) regarding the role of CYP2D6 and tamoxifen highlights several controversies that exist in the clinical and biomarker field for women with breast cancer. The International Tamoxifen Pharmacogenomics Consortium (ITPC) was formed with the intent to aggregate, curate, and analyze the data available in published breast cancer studies with the hope of answerin...
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BACKGROUND CYP2D6 is considered the key enzyme in tamoxifen metabolism. Several studies have investigated the relationship between the CYP2D6 genotype and tamoxifen treatment outcome, with discrepant results. CYP2D6 inhibitor use, aromatase inhibitor use, and chemotherapy may account for some of the discrepancies. We examined the association between CYP2D6 genotype and early breast cancer event...
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