Mice bearing MDA-MB-231 tumours were administered [89Zr]Zr-Df-ATG-101 (36 μg, 3.9 MBq) alone or in addition of 1 mg of non-radiolabelled antibodies including ATG-101, anti-4-1BB, or anti-PD-L1 (Fig. 5). The gene discussed is TNFRSF9; the disease is neoplasm.