ERBB2 and neoplasm: This chelator demonstrated promising in vitro properties in EDTA and DFO challenge experiments; however, in vivo [89Zr]Zr-DFO-cyclo*-NCS-trastuzumab did not show superiority over [89Zr]Zr-DFO*-NCS-trastuzumab in HER2+ SKOV-3 tumour-bearing mice.