TUMOR INFARCTION IN MICE BY ANTIBODY-DIRECTED TARGETING OF TISSUE FACTOR TO TUMOR VASCULATURE

Selective occlusion of tumor vasculature was tested as a therapy for s olid tumors in a mouse model. The formation of blood clots (thrombosis ) within the tumor Vessels was initiated by targeting the cell surface domain of human tissue factor, by means of a bispecific antibody, to an experimentally induced marker on tumor vascular endothelial cells. This truncated form of tissue factor (tTF) had limited ability to init iate thrombosis when free in the circulation, but became an effective and selective thrombogen when targeted to tumor endothelial cells. Int ravenous administration of the antibody-tTF complex to mice with large neuroblastomas resulted incomplete tumor regressions in 38 percent of the mice.