Abstract: Objective The aim of this study was to explore the correlation between postoperative aromatase inhibitor(AIs)- based bone metabolism and ERα gene rs9340799,rs2234693 single nucleotide polymorphisms(SNPs)in breast cancer. Methods One hundred and sixty-six breast cancer patients who underwent AIs treatment(≤2 years)were enrolled and hospitalized in our hospital from October 2015 to April 2017.The ERα gene rs9340799 and rs2234693 sites were sequenced and compared subtype of lumbar spine and femur,bone mineral density BMD value and the relationship between BMD value and T value. Results The BMD of lumbar spine in patients with ERα gene rs9340799 was significantly different when compared to those of A/A,A/G and G/G(P＜0.01).The BMD of lumbar spine in patients with A/A and A/G genotypes were significantly higher than those in G/G genotypes(P＜0.05).The BMD of lumbar spine in patients with ERα gene rs2234693 was significantly different when compared to those of T/T,T/C and C/C(P＜0.01).The BMD of lumbar spine in patients with T/T and C/T genotypes were significantly higher than those in C/C genotypes(P＜0.05).However,there was no difference in femoral BMD,lumbar spine,and femur T between the 2 subtypes of patients with genotypes(P＞0.05). Conclusion Aromatase inhibitor-related bone loss(AIBL)may be related to ERα gene phenotype.In ERα gene rs9340799 and rs2234693 loci,C and G alleles may be susceptible genes for aromatase inhibitor-related bone loss(AIBL).

Key words: Breast cancer, Aromatase inhibitors, Abnormal bone metabolism, ER α genes, Single nucleotide polymorphisms