Compared with normal individuals, the level of PITX1 gene expression was significantly higher in invasive breast carcinoma, invasive ductal breast carcinoma, invasive lobular breast carcinoma, ductal breast carcinoma, medullary breast carcinoma, invasive ductal and invasive lobular breast carcinoma and tubular breast carcinoma (Figure 2A–K, P=9.96E-28, 3.35E-42, 2.88E-13, 1.18E-7, 2.70E-9, 2.49E-1.4, 1.85E-30, 1.60E-39, 1.48E-76, 1.41E-5 and 3.43E-1.4). Here, PITX1 is linked to invasive ductal breast carcinoma.