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http://dx.doi.org/10.7314/APJCP.2015.16.8.3559

Breast Cancer Association with CYP1A2 Activity and Gene Polymorphisms - a Preliminary Case-control Study in Tunisia  

Ayari, I (Metabolic Biophysics and Applied Pharmacology Laboratory, Department of Biophysics, Faculty of Medicine, University of Sousse)
Arnaud, MJ (Nutrition & Biochemistry)
Mani, A (Metabolic Biophysics and Applied Pharmacology Laboratory, Department of Biophysics, Faculty of Medicine, University of Sousse)
Pavanello, S (Occupational Health Section, Department of Cardiological, Thoracic and Vascular Sciences, University of Padova)
Saguem, S (Metabolic Biophysics and Applied Pharmacology Laboratory, Department of Biophysics, Faculty of Medicine, University of Sousse)
Publication Information
Asian Pacific Journal of Cancer Prevention / v.16, no.8, 2015 , pp. 3559-3563 More about this Journal
Abstract
The aim of the present study was to evaluate the relative contribution of CYP1A2 isoforms (-3860 G/A, -2467T/delT and -163C/A) in control subjects and breast cancer patients to the metabolism of caffeine in human liver. Restriction fragment length polymorphism analysis of PCR-amplified Fragments (PCR-RFLP) was used for the genotyping of CYP1A2 SNPs and HPLC allowed the phenotyping through the measurement of CYP1A2 activity using the 17X + 13X + 37X/137X urinary metabolite ratio (CMR) and plasma caffeine half life (T1/2). The CYP1A2 -3860A genotype was associated with a decreased risk of breast cancer. In contrast, distributions of the CYP1A2 -2467T/delT or -2467delT/delT and -163A/C or A/A genotypes among breast cancer patients and controls were similar. When the genotype and phenotype relationship was measured by comparing the mean CMR ratios and caffeine half life within the genotype groups between subjects and breast cancer patients, there were no significant differences except for -3860 A, most of them being homozygous for the -3860 G/G SNP and had a significant higher mean CMR ratio and half life than those with -3860 G/A (P=0.02). The results of this preliminary study show a significant association between CP1A2 -3860 G variant and CYP1A2 phenotype which must be confirmed by further large-size case-control studies.
Keywords
Breast cancer; CYP1A2; gene polymorphism; phenotype;
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