CYP3A5 genotypes and risk of oesophageal cancer in two South African populations.
CYP3A5 is the major cytochrome P450 enzyme in the oesophagus and metabolises many potentially carcinogenic compounds. The frequencies of CYP3A5 allelic variants, CYP3A5*2, *3, *6 and *7 which code for enzymes with severely decreased activities were compared between 241 oesophageal cancer patients and 272 controls in Black and Mixed Ancestry South Africans. A significantly higher frequency of CYP3A5*3 was observed in the controls compared to patients amongst the Mixed Ancestry group (P=0.025). Individuals homozygous for defective CYP3A5 had reduced risk of developing oesophageal cancer (P=0.032).
MRC/UCT Oesophageal Cancer Research Group, Division of Medical Biochemistry, Institute for Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Observatory, Cape Town 7925, South Africa.
Collet
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Dandara
Robea
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Ballo
M Iqbal
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D000483:Alleles; D044383:Black People / Q000235:genetics*; D051544:Cytochrome P-450 CYP3A; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D004938:Esophageal Neoplasms / Q000235:genetics*; D005787:Gene Frequency / Q000235:genetics; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D012150:Polymorphism, Restriction Fragment Length; D013019:South Africa
D003577:Cytochrome P-450 Enzyme System; C104464:CYP3A protein, human; C510164:CYP3A5 protein, human; D051544:Cytochrome P-450 CYP3A