Specifically, 9 SNPs in prot-a-1943, 10 SNPs in prot-a-641, 12 SNPs in prot-a-612, 13 SNPs in prot-a-2190, 17 SNPs in prot-a-2129, and 18 SNPs in prot-a-2575 showed significant associations with breast cancer in European populations. This evidence concerns the gene SLC6A7 and breast cancer.