Our studies clearly showed that the myoepithelial cells at the border between the tumor cells and stromal cells do not express elevated levels of HER2 protein or mRNA and so they are normal myoepithelial cells that are recruited to the tumor and/or remain as part of the normal myoepithelium that surrounded the duct in which the tumor arose or into which it migrated. Here, ERBB2 is linked to neoplasm.