PLK1 expression was found to be upregulated in almost all different subtypes of breast cancer by analy'sing a wide range of dataset, including invasive ductal and invasive lobular breast cancer, tubular breast cancer, invasive lobular breast cancer, mucinous breast cancer, invasive ductal breast cancer and mixed lobular and mammary glands (Figure 8A). This evidence concerns the gene PLK1 and invasive tubular breast carcinoma.