David Cheresh, a well known researcher from UCSD, gave a lecture here at UNC today. In a somewhat unusual departure from my normal habit, I actually attended and took notes. If you're curious, the title was "A Role for VEFG as a Negative Regulator of Pericyte Function and Blood Vessel Maturation." Both VEGF and PDGF are angiogenesis stimulators, and as you'd expect, both increase the growth rate of cancer tumors. What you might not expect is that if VEGF and PDGF are administered together, in tumors with receptors for both peptides, the blood vessels in the tumors regress. That is, the growth factors separately improve neovascularization but together, where you'd expect some synergy, instead they suppress neovascularization. Weird. What I found interesting is the clinical application of this research. You see, tumors tend to support their rapid growth by secreting a butt load of VEGF, which increases angiogenesis; however it does so in a pell-mell fashion which ...