In addition, we examined the association between the CYP19 genotype and breast cancer by defining the variant allele(s) by treating each of the 10 or more repeat alleles, (TTTA)10, (TTTA)11, (TTTA)12 and (TTTA)13, separately as the variant allele under each of the three models (realizing that this might have increased the chance of our finding of a statistically significant association; see the Discussion section). This evidence concerns the gene CYP19A1 and breast cancer.