Your log picquet my curiosity in GW-501516. It gets a lot of hits as being positively correlated to cancerous tumor growth. Did you come across this at all when you were researching it? What conclusions did you draw about that?
Here's one:
http://ajplung.physiology.org/content/294/6/L1238.full
Here's one:
http://ajplung.physiology.org/content/294/6/L1238.full