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PUBLICATION: Genetic variants in the mTOR pathway and breast cancer risk in African American women.Carcinogenesis, 2015 Nov 16. pii: bgv160 PMID: 26577839

by Cheng T-Y C, Ambrosone CB, Hong C-C, Lunetta KL, Liu S, Hu Q, Yao S, Sucheston-Campbell L, Bandera EV, Ruiz-Narváez EA, Haddad S, Troester MA, Haiman CA, Bensen JT, Olshan AF, Palmer JR, Rosenberg L.
Mon, Nov 16th 2015 03:00 pm

 ABSTRACT: The phosphatidylinositol 3-kinase-AKT-mammalian target of rapamycin (mTOR) pathway has been implicated in breast carcinogenesis. However, there has been no large-scale investigation of genetic variants in the mTOR pathway and breast cancer risk. We examined 28847 single-nucleotide polymorphisms (SNPs) in 61 mTOR pathway genes in the African American Breast Cancer Epidemiology and Risk consortium of 3663 cases [1983 estrogen receptor-positive (ER+) and 1098 ER-negative (ER-)] and 4687 controls. Gene-level analyses were conducted using the adaptive rank truncated product (ARTP) test for 10773 SNPs that were not highly correlated (r (2) < 0.8), and SNP-level analyses were conducted with logistic regression. Among genes that were prioritized (nominal P < 0.05, ARTP tests), associations were observed for intronic SNPs TSC2 rs181088346 [odds ratio (OR) of each copy of variant allele = 0.77, 95% confidence interval (CI) = 0.65-0.88 for all breast cancer] and BRAF rs114729114 (OR = 1.53, 95% CI = 1.24-1.91 for all breast cancer and OR = 2.03, 95% CI = 1.50-2.76 for ER- tumors). For ER- tumors, intronic SNPs PGF rs11542848 (OR = 1.38, 95% CI = 1.15-1.66) and rs61759375 (OR = 1.34, 95% CI = 1.14-1.57) and MAPK3 rs78564187 (OR = 1.26, 95% CI = 1.11-1.43) were associated with increased risk. These SNPs were significant at a gene-wide level (Bonferroni-corrected P < 0.05). The variant allele of RPS6KB2 rs35363135, a synonymous coding SNP, was more likely to be observed in ER- than ER+ tumors (OR = 1.18, 95% CI = 1.05-1.31, gene-wide Bonferroni-corrected P = 0.06). In conclusion, specific mTOR pathway genes are potentially important to breast cancer risk and to the ER negativity in African American women.

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