CSF1R and neoplasm: As 10 mg/kg of [89Zr]Zr-DFO-N-suc-CSF1R-mAb showed blood pool levels up to 72 h, thereby allowing sufficient time for circulating antibody to potentially reach the tumor, we compared the biodistribution of 10 mg/kg of [89Zr]Zr-DFO-N-suc-CSF1R-mAb and 10 mg/kg of isotype control [89Zr]Zr-DFO-N-suc-IgG2a in orthotopic KEP tumor-bearing FVB/N mice.