Development of Biologic Markers of Response and Assessment of Antiangiogenic Activity in a Clinical Trial of Human Recombinant Endostatin

These initial data suggest that rh-Endo has measurable effects on tumor blood flow and metabolism and induces endothelial and tumor cell apoptosis even in the absence of demonstrable anticancer effects. Further study and validation of these biomarkers in the context of antiangiogenic therapy will be required.