EGFR and neoplasm: Binding properties of the unlabelled nanobodies D10 and F5 were compared to the ones of radiolabelled nanobodies 99mTc-D10 and 99mTc-F5 on endogenously expressed EGFR on A431, MDA-MB-231 and MDA-MB-468 tumour cells using flow cytometry after decay of the radioactivity.