ERBB2 and cancer: [18F]fluorobenzyl azide-Heraptamer-1 and [18F]fluorobenzyl azide-Heraptamer-2 conjugates have been developed for HER2 cancer and in vitro studies were performed with HER2 extracellular domain, using the HER2 positive SKOV3 cell line and the HER2 negative MDA-MB-231 cell line.