NTN1 and breast ductal adenocarcinoma: To determine whether this concomitant change in DAPK1 and NTN1 expression was also observed at the protein levels, DAPK1, UNC5B, and netrin‐1 were measured by immunohistochemistry (IHC) using tissue microarrays (70 sections) from human breast ductal carcinoma (Super Bio Chips).