Cumulative epidemiological evidence of an association was graded as strong for rs7903146 [odds ratio (OR) = 1.05, p = 4.13 × 10<sup>-5</sup> ] and rs7904519 (OR = 1.07, p = 2.02 × 10<sup>-14</sup> ) in breast cancer, rs11196172 (OR = 1.11, p = 2.22 × 10<sup>-16</sup> ), rs12241008 (OR = 1.13, p = 1.36 × 10<sup>-10</sup> ) and rs10506868 (OR = 1.10, p = 3.98 × 10<sup>-9</sup> ) in colorectal cancer, rs7086803 in lung cancer (OR = 1.30, p = 3.54 × 10<sup>-18</sup> ) and rs11196067 (OR = 1.18, p = 3.59 × 10<sup>-13</sup> ) in glioma, moderate for rs12255372 (OR = 1.12, p = 2.52 × 10<sup>-4</sup> ) in breast cancer and weak for rs7903146 (OR = 1.11, p = 0.007) in colorectal cancer.
This meta-analysis demonstrated that TCF7L2 gene polymorphisms (rs12255372 and rs7903146) are associated with an increased susceptibility to brea</span>st cancer.
Genetic variations in transcription factor 7-like 2 (TCF7L2) gene: association of TCF7L2 rs12255372(G/T) or rs7903146(C/T) with breast cancer risk and clinico-pathological parameters.
Specifically, the same risk allele of single nucleotide polymorphism (SNP) rs12255372 that is associated with diabetes (T allele) has recently been associated with an increased risk of breast cancer.