ERBB2 and breast cancer: In the present study, 42 healthy women (named healthy controls (HC)) and 42 BC patients categorized into 5 subtypes, namely luminal A (n = 11), luminal B-HER2 negative (n = 10), luminal B-HER2 positive (n = 7), HER2 positive (n = 6), and triple negative (n = 8) were recruited.