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Experimental Therapeutics |
Departments of Cancer and Infection Research [S. R. W., D. J. O., M. D., J. K., J. O. C., B. C., A. P. T., E. S. E. S.] and Safety of Medicines [G. H. P. R., P. F. W.], AstraZeneca Pharmaceuticals, Alderley Park, Macclesfield, Cheshire SK10 4TG, United Kingdom, and AstraZeneca Pharma, Centre de Recherches, 51064 Reims, France [L. F. H.]
There is evidence that vascular endothelial growth factor (VEGF)
contributes to solid tumor growth through the promotion of both
angiogenesis and tumor vascular permeability. To abrogate VEGF
signaling, we developed a small molecular weight inhibitor of VEGF
receptor tyrosine kinase (RTK) activity that was compatible with
chronic oral administration. ZD4190, a substituted
4-anilinoquinazoline, is a potent inhibitor of KDR and Flt-1 RTK
activity, and VEGF stimulated HUVEC proliferation in
vitro. Chronic once-daily oral dosing of ZD4190 to young rats
produced a dose-dependent increase in the femoral epiphyseal growth
plate area, which may be attributed to the inhibition of VEGF signaling
in vivo because vascular invasion of cartilage is a
prerequisite to the process of ossification. Once-daily oral dosing of
ZD4190 to mice bearing established (
0.5 cm3) human tumor
xenografts (breast, lung, prostate, and ovarian) elicited significant
antitumor activity and at doses that would not be expected to have any
direct antiproliferative effect on tumor cells. Prolonged tumor
cytostasis was further demonstrated in a PC-3 xenograft model with 10
weeks of ZD4190 dosing, and upon withdrawal of therapy, tumor growth
resumed after a short delay. These observations are entirely consistent
with the proposed mode of action. ZD4190 is one of a series of VEGF RTK
inhibitors that may have utility in the treatment of a range of
histologically diverse solid tumor types.
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