CD37 and neoplasm: Furthermore, tumor uptake was comparable for 10, 25 and 100 μg [89Zr]Zr-N-sucDf-NNV003, with 10.6 (± 2.7), 12.4 (± 3.4) and 10.1 (± 2.1) %ID/g respectively, indicating CD37 is not saturated in tumor cells by addition of unlabeled antibody at these protein doses.