ERBB2 and breast cancer: For breast cancer molecular imaging, there were some reports about target molecules with labelled radioisotope, for example 18F‐labelled aptamers of human epidermal growth factor receptor 2 (Her2/ErbB2),21125I/131I‐labelled anti ICAM‐122 ( intercellular cell adhesion molecule‐1) and 89Zr‐Transferrin.23 However, these target molecules still exist some deficiency, such as low selection and low molecular expression on tumour.