Trastuzumab was initially labelled with indium‐111, and primary and metastatic lesions could be visualised in mice by imaging with single‐photon emission computed tomography (SPECT).17 [111In]‐Labelled trastuzumab was studied in humans, and HER2‐positive tumour lesions and new tumour lesions were detected. This evidence concerns the gene ERBB2 and neoplasm.