QSOX1 localization in normal and breast cancer tissues. Anti-QSOX1 IHC on normal mammary gland section (A, B) and on invasive ductal carcinoma (IDC) section (C, D, E). (A) The first arrow (1) indicates the presence of labelling in normal breast ductulo-lobular units. (B) Perinuclear and apical staining in ductulo-lobular unit cells. (C) The second arrow (2) indicates a labelling in tumor cells from IDC and the third arrow (3) shows the absence of labelling in stroma cells. (D) Diffuse cytoplasmic staining in tumors cells. (E) Perinuclear and apical labelling in non cancerous cells from IDC.