ERBB2 and neoplasm: As previously reported in the results session, no specific correlation between either epithelial or stromal PN expression with any of the clinical-pathological variables considered by us (age at surgery, menopausal status, tumour size, nodal status, ER status, PgR status, HER2 expression/amplification, proliferative activity, tumour phenotype defined on the basis of the last 4 variables) was found (Table 2).