Distribution of membranous ALCAM expression in AA and CAU breast cancer patients. ALCAM levels were determined by immunohistochemistry (IHC) according to the immunoreactive Score (IRS) by combining both intensity of IHC and percentage of tumor cells stained as stated in materials and methods. The x-axis indicates the Membranous ALCAM Immunoreactive score (IRS). The range of IRS is from 0 (negative staining) to 12. The y-axis indicates the frequency of cases.