The Relationship Between miR-423 Genetic Variation and Women Breast Cancer Risk In the North of Iran

MicroRNAs (miRs) are small noncoding RNAs that inhibit protein expression by posttranscriptional inhibition. They are fundamental regulators of diverse cellular processes; whose deregulation contributes to many human diseases including cancer. Single nucleotide polymorphisms (SNPs) of the genes encoding miRNAs can alter miRNA expression and may influence cancer risk.
To determine the relationship between miR-423 (rs6505162 C>A) polymorphism and women breast cancer risk.
In this case-control study, the genotypes of 353 women with breast cancer and 353 healthy women were compared. Genomic DNA was extracted from peripheral blood. The miR-423 rs6505162 C>A polymorphism was determined by PCR-RFLP using RsaI enzyme. The data analysis was performed using the MedCalc software.
The prevalence rates of genotype frequencies of the CC, CA and AA were 60.34%, 35.41% and 4.24%, respectively, in those with breast cancer, whilst in controls were 51%, 38.81% and 10.20%, respectively. The AA genotype and A allele of rs6505162 C>A had a decreased risk to develop breast cancer (OR=0.35; 95%CI 0.18-0.66; P=0.001; OR=0.66; 95%CI 0.52-0.85; P=0.00, respectively).
our data demonstrated that miR-423 rs6505162 should be a protective factor for breast cancer. Further studies involving different ethnicities are required to verify our conclusion.