Soluble Tie2 and Flt1 extracellular domains in serum of patients with renal cancer and response to antiangiogenic therapy.
Antiangiogenesis drugs can be difficult to evaluate because they produce disease stabilization rather than tumor regression. Markers of endothelial mass in tumors may be of value to monitor therapy and evaluate such drugs. Soluble domains of the endothelial receptor tyrosine kinases, sTie2 (angiopoietin receptor) and sFlt1 (vascular endothelial growth factor receptor-1) were analyzed by sandwich ELISA in serum samples from 43 patients with advanced renal cancer before and 1 month after antiangiogenic therapy with razoxane. Pretreatment sFlt1 levels were 0.77 ng/ml +/- 0.48 (SD) and sTie2 74.3 ng/ml +/- 15 (SD). Pretreatment sFlt1 levels above the median were associated with a lesser chance of stable disease (P = 0.04) and poorer survival (P = 0.01). Fall of sTie2 on treatment was associated with stable disease (P = 0.05) and improved survival (P = 0.04). The soluble receptors measured weeks before response were assessed and correlated with response and survival, showing they may be useful to monitor and develop antiangiogenic therapy.
Harris
A L
AL
Imperial Cancer Research Fund, Molecular Oncology Laboratories, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DS, United Kingdom. aharris.lab@icrf.icnet.uk
Reusch
P
P
Barleon
B
B
Hang
C
C
Dobbs
N
N
Marme
D
D
D000970:Antineoplastic Agents / Q000627:therapeutic use*; D001665:Binding Sites; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000097:blood / Q000098:blood supply / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009389:Neovascularization, Pathologic / Q000473:pathology / Q000517:prevention & control*; D011379:Prognosis; D011518:Proto-Oncogene Proteins / Q000097:blood / Q000187:drug effects*; D011929:Razoxane / Q000627:therapeutic use*; D020794:Receptor Protein-Tyrosine Kinases / Q000097:blood / Q000187:drug effects*; D042787:Receptor, TIE-2; D012995:Solubility; D016019:Survival Analysis; D016896:Treatment Outcome; D040281:Vascular Endothelial Growth Factor Receptor-1
D000970:Antineoplastic Agents; D011518:Proto-Oncogene Proteins; D011929:Razoxane; D020794:Receptor Protein-Tyrosine Kinases; D042787:Receptor, TIE-2; D040281:Vascular Endothelial Growth Factor Receptor-1