Protein expression of QSOX1 is specific for breast tumor cells in tissue. a.) Graphical representation of "High QSOX1 staining (n = 65)" column from Table 1. Each graph correlates with percentages of QSOX1 positive cells listed in Table 1 for the "High QSOX1 staining (n = 65)" column b.) normal breast tissue showing no QSOX1 staining; c.) grade 1 invasive ductal carcinoma (IDC) ER+ PR+ breast tumor tissue showing low QSOX1 staining; d.) grade 2 IDC ER+ PR+ breast tumor tissue showing moderate QSOX1 staining; e.) grade 3 IDC, ER+, PR+ showing high QSOX1 staining; f.) grade 3 invasive lobular carcinoma (ILC), ER+, PR- showing high QSOX1 staining. Polyclonal antibody recognizes residues 1-329 of both QSOX1-S and -L.