NTRK1 and breast cancer: Human epidermal growth factor receptor 2 (HER2, also known as ErbB2), a tyrosine kinase receptor, is highly expressed in breast cancer.54 HeA2-1 and HeA2-3 were two aptamers targeting HER2 on the surfaces of human breast cancer cells (SKBR3).55 A novel diagnostic method for breast cancer was constructed based on specific carbon nanotube (CNT)-wrapped anti-HER2 aptamers.