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Several melanomas and hepatocellular carcinomas showed moderate to strong cytoplasmic positivity. A single case of adenocarcinoma of lung exhibited moderate nuclear immunoreactivity. Remaining cancer tissues were negative.
A majority of colorectal cancers along with several breast, ovarian, urothelial, stomach and pancreatic cancers displayed moderate cytoplasmic positivity with additional membranous staining in several cases. Several hepatocellular carcinomas were strongly stained. Remaining cancer cells were negative.
GENE INFORMATION
Gene name
CYP2A6 (HGNC Symbol)
Synonyms
CPA6, CYP2A, CYP2A3
Description
Cytochrome P450, family 2, subfamily A, polypeptide 6 (HGNC Symbol)
Entrez gene summary
This gene, CYP2A6, encodes a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases which catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. This protein localizes to the endoplasmic reticulum and its expression is induced by phenobarbital. The enzyme is known to hydroxylate coumarin, and also metabolizes nicotine, aflatoxin B1, nitrosamines, and some pharmaceuticals. Individuals with certain allelic variants are said to have a poor metabolizer phenotype, meaning they do not efficiently metabolize coumarin or nicotine. This gene is part of a large cluster of cytochrome P450 genes from the CYP2A, CYP2B and CYP2F subfamilies on chromosome 19q. The gene was formerly referred to as CYP2A3; however, it has been renamed CYP2A6. [provided by RefSeq, Jul 2008]
GO:0005506 [iron ion binding] GO:0005737 [cytoplasm] GO:0006805 [xenobiotic metabolic process] GO:0008392 [arachidonic acid epoxygenase activity] GO:0008395 [steroid hydroxylase activity] GO:0016705 [oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen] GO:0016712 [oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen, reduced flavin or flavoprotein as one donor, and incorporation of one atom of oxygen] GO:0019373 [epoxygenase P450 pathway] GO:0019825 [oxygen binding] GO:0020037 [heme binding] GO:0043231 [intracellular membrane-bounded organelle] GO:0055114 [oxidation-reduction process]