Polymorphisms in ESR1 (rs3798577) and IL6 (rs1800795 and rs1800797) were evaluated by real-time PCR in 391 breast cancer patients and 79 healthy controls.
The C allele of the rs3798577:T>C variant was associated with decreasedBC risk in Asians (OR = 0.828, 95% CI: 0.730-0.939), while Caucasians with this allele were found to experience significantly increased BC risk (OR = 1.551, 95% CI: 1.037-2.321).
The genotypes CC and CT of rs3798577 were significantly associated with the cancers risk (p-trend breast = 4 × 10(-5); p-trend cancers = 1 × 10(-5)); in discrepancy with breast cancer where the C-allele represented the risk allele, for bladder, hepatocellular carcinomas and leukemia, the T allele seems to confer susceptibility.
Our results showed that rs3798577 was significantly associated with the risk of breast cancer, the common allele C conferring susceptibility (p-trend=4 x 10(-5)); rs3798577 was also correlated with PR expression (p=0.01), but not with ER expression; rs2228480 (p=0.047) and rs1801132 (p=0.02) were associated with the age at diagnosis; rs1801132 was correlated with hypercholesterolemia (p=0.003) and increased BMI (body mass index) (p=0.01); rs2234693 showed a low significant association (p=0.042) with the tumor grade; rs3798577 was correlated with disease-free survival (p=0.05), allele C conferring increased risk for relapses, but it reached not statistical significance after adjustments.
This study provides evidence that polymorphisms CYP17 rs743572, CYP19 rs10046 and ER-alpha rs3798577 are associated with breast cancer risk among Chinese women.