A, transversal and coronal microPET images of 89Zr-ranibizumab at 24 hours pi of the tracer. A, transversal and coronal microPET images of 89Zr-ranibizumab.

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A, transversal and coronal microPET images of 89Zr-ranibizumab at 24 hours pi of the tracer. A, transversal and coronal microPET images of 89Zr-ranibizumab at 24 hours pi of the tracer. High tumor to background ratios clearly visualize a more pronounced reduction in the tumor center compared with the tumor rim after 7 day of sunitinib treatment. After 7 days of discontinuation, 89Zr-ranibizumab uptake increases (paired samples). At day 14 of sunitinib treatment, 89Zr-ranibizumab uptake returns to baseline in the tumor rim while remaining low in the tumor center. B, 89Zr-ranibizumab quantification of tumor rim and center of mice treated with sunitinib for 1 week at day 7 and following a stop week and after 14 days (C) of sunitinib treatment. Individual tumor uptake values are normalized relative to baseline. D, change in average tumor uptake (both rim and center) of 89Zr-ranibizumab and 89Zr-Fab-IgG after 7 days of sunitinib and after a stop week in A2780 xenograft model. *, P < 0.05; **, P < 0.01. Data presented as SEM. Wouter B. Nagengast et al. Cancer Res 2011;71:143-153 ©2011 by American Association for Cancer Research