Table 3.

Summary of Chelator Number and Radiolabeling Yield Obtained with ⁸⁹Zr for Each Immunoconjugate^a

	DFO-NCS–trastuzumab	4a– trastuzumab	4b– trastuzumab	8– trastuzumab
av no. of chelators	1.03	0.54	0.81	0.45
radiolabeling yield (90 min, 25 °C)	95 ± 2%	92 ± 3%	63 ± 5%	16 ± 2%

^aDetermined using radiometric isotope dilution assay.