MUC1 and neoplasm: 72 h after i.v. injection into hMUC1-B16.F10 tumor-bearing mice, 89Zr-labelled GT-00AxIL15 was detected in the TA-MUC1+ tumor as well as in lymphoid organs (spleen and lymph nodes) and in the liver indicating clearance via the hepatobiliary pathway as described for other IL-15 agonists [15] (Figure 5A).