- Combined therapy with direct and indirect angiogenesis inhibition results in enhanced antiangiogenic and antitumor effects. Abdollahi, A., Lipson, K.E., Sckell, A., Zieher, H., Klenke, F., Poerschke, D., Roth, A., Han, X., Krix, M., Bischof, M., Hahnfeldt, P., Grone, H.J., Debus, J., Hlatky, L., Huber, P.E. Cancer Res. (2003)