Asian Pacific Journal of Cancer Prevention

Asian Pacific Journal of Cancer Prevention (아시아태평양암예방학회)
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Parathyroid Hormone Gene rs6256 and Calcium Sensing Receptor Gene rs1801725 Variants are not Associated with Susceptibility to Colorectal Cancer in Iran

  • Mahmoudi, Touraj (Gastroenterology and Liver Diseases Research Center, Shahid Beheshti University of Medical Sciences) ;
  • Karimi, Khatoon (Gastroenterology and Liver Diseases Research Center, Shahid Beheshti University of Medical Sciences) ;
  • Arkani, Maral (Gastroenterology and Liver Diseases Research Center, Shahid Beheshti University of Medical Sciences) ;
  • Farahani, Hamid (Department of Physiology, School of Medicine, Qom University of Medical Sciences) ;
  • Nobakht, Hossein (Internal Medicine Department, Semnan University of Medical Sciences) ;
  • Dabiri, Reza (Internal Medicine Department, Semnan University of Medical Sciences) ;
  • Asadi, Asadollah (Department of Biology, Faculty of Science, University of Mohaghegh Ardabili) ;
  • Zali, Mohammad Reza (Gastroenterology and Liver Diseases Research Center, Shahid Beheshti University of Medical Sciences)
  • Published : 2014.08.15
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Abstract

Background: Substantial evidence from epidemiological studies has suggested that increased levels of calcium may play a protective role against colorectal cancer (CRC). Given the vital role of calcium sensing receptor (CaSR) and parathyroid hormone (PTH) in the maintenance of calcium homeostasis, we explored whether the rs1801725 (A986S) variant located in exon 7 of the CaSR gene and the rs6256 variant located in exon 3 of PTH gene might be associated with CRC risk. Materials and Methods: In this study 860 subjects including 350 cases with CRC and 510 controls were enrolled and genotyped using PCR-RFLP methods. Results: We observed no significant difference in genotype or allele frequencies between the cases with CRC and controls for both CaSR and PTH genes either before or after adjustment for confounding factors including age, BMI, sex, smoking status, and family history of CRC. Furthermore, no evidence for effect modification of any association of rs1801725 and rs6256 variants and CRC by BMI, sex, or tumor site was observed. In addition, there was no significant difference in genotype and allele frequencies between the normal weight (BMI < $25kg/m^2$) cases and overweight/obese (BMI ${\geq}25kg/m^2$) cases for the two SNPs. Conclusions: These data indicated that the CaSR gene A986S variant is not a genetic contributor to CRC risk in the Iranian population. Furthermore, our results suggest for the first time that PTH gene variant does not affect CRC risk. Nonetheless, further studies with larger sample size are needed to validate these findings.

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References

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