Prostatic Alpha-Linolenic Acid ALA Is Positively Associated with Aggressive Prostate Cancer: A Relationship Which May Depend on Genetic Variation in ALA MetabolismReportar como inadecuado




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Previous observational studies have reported associations between prostate cancer and alpha-linolenic acid ALA. However, few investigations have been able to study this relationship prospectively and in well-controlled settings. Moreover, no studies have determined whether single nucleotide polymorphisms SNPs that influence ALA metabolism are associated with this common cancer. The purpose of this study was to explore associations between prostatic levels of ALA, SNPs and prostate cancer-specific biomarkers in samples collected from a previous randomized clinical trial conducted using a presurgical model and which tested the effects of flaxseed supplementation, a rich source of ALA, prior to prostatectomy n = 134. Serum prostate-specific antigen PSA was determined and immunohistochemistry was used to assess tumor proliferation rate Ki67. Prostatic ALA was determined with gas chromatography. Seven previously identified SNPs associated with delta-6 desaturase activity rs99780, rs174537, rs174545, rs174572, rs498793, rs3834458 and rs968567 were tested for associations with prostatic ALA, PSA and Ki67. Despite consuming seven times more ALA per day, men in the flaxseed arm had similar amounts of prostatic ALA relative to men not consuming flaxseed. In unadjusted analysis, there were significant positive associations between prostatic ALA and PSA ρ = 0.191, p = 0.028 and Ki67 ρ = 0.186, p = 0.037. After adjusting for covariates flaxseed, age, race, BMI and statin-use the association between ALA and PSA remained p = 0.004 but was slightly attenuated for Ki67 p = 0.051. We did not observe associations between any of the SNPs studied and prostatic ALA; however, in models for PSA there was a significant interaction between rs498793 and ALA and for Ki67 there were significant interactions with ALA and rs99780 and rs174545. Independent and inverse associations were observed between rs174572 and Ki67. This study provides evidence that prostatic ALA, independent of the amount of ALA consumed, is positively associated with biomarkers of aggressive prostate cancer and that genetic variation may modify this relationship.



Autor: Maria Azrad , Kui Zhang, Robin T. Vollmer, John Madden, Thomas J. Polascik, Denise C. Snyder, Mack T. Ruffin, Judd W. Moul, Dean

Fuente: http://plos.srce.hr/



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