IL2RA and neoplasm: In a separate group of mice treated with intraperitoneal PMA injection, biodistribution results showed no change of tumor 89Zr-CD25 IgG uptake (8.0 ± 1.4%ID/g) or blood activity (5.7 ± 1.7%ID/g), compared to those of untreated controls (both P = NS; Figure 4B).