Abstract
To evaluate the association between breast cancer and cytosine-adenine (CA) dinucleotide repeat length polymorphisms in the promoter region of the Insulin-like Growth Factor 1 (IGF-1) gene, a case-control study of 215 breast cancer patients and 224 controls was conducted in Iranian women. The most common allele and genotype in both controls and patients were an allele length of 19 and a homozygous genotype of (CA)(19)/(CA)(19). Women with two alleles longer than 19 were found to be at a higher risk of breast cancer with an odds ratio of 4.1 (P = 0.0002). In contrast, women with two alleles shorter than 20 were at lower risk of breast cancer. These results suggest a novel association between CA repeat length in IGF-1 and risk of breast cancer.
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