The problem with this approach to treating cancer is that the anticoagulation cascade does have a lot of margin for error; hence, it will be hard for PCYC (or anyone else) to find a dose that is high enough to have anti-cancer efficacy without also causing severe bleeding (#msg-37030489).
In particular, they are trying to make the case that "a selective inhibitor of the Factor VIIa/tissue factor complex may have a greater therapeutic/safety index than inhibition of other coagulation factors." Sounds interesting, but sounds like a longshot.