MUC16 and neoplasm: Taking advantage of the available antibodies, Sharma et al., have demonstrated that a Zr-89 labeled anti-CA125 murine antibody B43.13 (57) (or 89Zr-DFO-mAb-B43.13) could be used for clear delineation of CA125 positive human tumor xenografts from negative tumors in mouse models (13) (Figure 1).