Biodistribution studies in neu-N transgenic mice with metastatic NT2.5 tumours at 4 h post i.v. injection of [213Bi]Bi-CHX-A′′-DTPA-anti-HER2-liposomes revealed high uptake in the spleen (40% ID/g) but relatively low uptake (< 5% ID/g) in other tissues. The gene discussed is ERBB2; the disease is neoplasm.