Abstract
Organic anion transporter polypeptides (OATPs, SLCOs) are involved in the uptake of conjugates steroid hormones such as estrone-3-sulfate. It has been suggested that the expression of OATPs in breast tissues could impact breast carcinogenesis and tumor pathology. The nuclear receptor pregnane X receptor (PXR) is involved in the regulation of SLCO1A2 expression. We investigated 31 variants located in PXR, SLCO1A2, SLCO1B1, SLCO1B3, and SLCO2B1 for an association with breast cancer risk and/or histo-pathological tumor characteristics. Polymorphisms were selected on the basis of a known or potential functional consequence and an allele frequency >2%. Genotyping was performed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry using the GENICA population-based breast cancer case-control collection comprising 1,021 cases and 1,015 age-matched controls. Statistical analysis was performed by SAS, and all tests were two-sided. None of the 31 analyzed transporter and PXR polymorphisms showed an association with breast cancer risk or tumor characteristics. Our data suggest that among the many known transporters common variations of PXR, SLCO1A2, SLCO1B1, SLCO1B3, and SLCO2B1 do not contribute to breast carcino...Continue Reading
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