ERBB3 and neoplasm: Comparing the molecules included in this study with other small HER3-targeting molecules, both [68Ga]Ga-(HE)3-ZHER3-DOTA and [68Ga]Ga-(HE)3-ZHER3-DOTAGA showed similar or higher tumor-to-liver ratios and higher tumor-to-blood ratios than a 89Zr-labeled nanobody21 and 68Ga-labeled HER3 peptide20.