Angiogenisis inhibition is not a new idea. It is an idea that mainstream medicine stole from alternative medicines decades ago. It really came to light with shark cartilage, although other cartilage sources work as well. 

Then mainstream medicine suddenly rushed to find their own angiogenesis inhibitors. The only one I have seen on the market is Endostatin, derived from rat urine.  Although this is a FDA approved approved angiogenesis inhibitor it does not appear to work very well though. I have posted on this before if you search Endostatin.

Another interesting, but little known fact is that malignant tumors also secrete their own angiogenesis inhibitors. This is actually a survival mechanism for the cancer.  Malignant tumors are rarely alone. Metastasized cells can lodge elsewhere in the body forming smaller tumors. The primary tumor secretes growth factors such as vascular endothelial growth factor (VEGF) to grow blood vessels between the tumor and a major blood vessel. The growth of the tumor is slow until these blood vessels connect the tumor to the blood vessel. Once this happens the tumor has a major food source and the growth is accelerated. The idea of natural and pharmaceutical angiogenesis inhibitors is to prevent this growth of the blood vessels helping to starve the tumor. I would not call these a cure though since the growth of the cancer is not stopped by angiogenesis inhibition. It is only slowed. Anyway, the reason the primary tumor secretes small amounts of angiogenesis inhibitors in conjunction with the larger amounts of vascular growth factors is to suppress growth of the secondary tumors. This leaves more food for the primary tumor. Basically survival of the fittest.