a, Tumor volumes in mice from sensitive lines (XP374 or
XP144) switched from vehicle or sunitinib to PT2399 as indicated (bottom
black arrows). b, Circulating tumor-produced hVEGF levels in
mice treated with vehicle, sunitinib, or sunitinib followed by PT2399. The
Wilcoxon rank-sum test was used to determine if sunitinib
(n = 4) or sunitinib followed by PT2399
(n = 6) were different than vehicle (n
= 4). *, p<0.05. Boxplots have median centre
values. c, Representative images of H&E and Ki67
staining of tumors from mice (XP144) treated with vehicle or sunitinib (left
panel) and from tumors following a switch to PT2399 (right panel). Scale
bars = 100 µM.