ERBB2 and cancer: However, the expression levels of ER and PR did not exhibit a statistically significant difference among non-malignant and malignant tumors (P = 0.875, P < 0.05) whereas HER2 was found to be intensely expressed in 35 out of 62 malignant tumors (56.45%) compared to 6 out of 22 non-mlaignant tumors (27.27%) showing a statistically significant association (P < 0.05).