ERBB2 and neoplasm: HER3 expression correlated positively to HER2 (r=0.532, P=0.009) as well as HER4 (r=0.480, P=0.020), but negatively to EGFR/HER1 (r=-0.450, P=0.031, Table 4) in tumour tissue from postmenopausal patients.