Tumour uptake was high in patients with metastatic breast cancer, and HER2‐positive tumour lesions could also be detected in liver, lung, bone and brain.21 Labelling biomolecules with zirconium‐89 is useful because of its long half‐life of 3.3 days.22 The radiation dose to patients from [89Zr]‐labelled trastuzumab is 2.5 times higher than imaging with 2‐deoxy‐2‐[18F]fluoro‐D‐glucose. The gene discussed is ERBB2; the disease is neoplasm.