Because the expression of TROLL-2 and TROLL-3 positively correlate with breast cancer progression, we assessed the expression levels of their 2 interacting proteins, WDR26 and NCOA5, in a TMA of breast cancer progression with 45 samples, comprising normal breast tissue, lobular hyperplasia, DCIS, and invasive breast cancer biopsies. This evidence concerns the gene WDR26 and breast cancer.