Gempicker makes a really good point here, these press releases don't happen by accident, there's a lot of work gone in to allow this type of communique, not least convincing an eminent cardiovascular surgeon about the potential use of SVFCs technology.
We can only speculate how many other activities are going on that we don't know about which will advance the SVFC cause; if I worked at YA, I'd leave SVFC to carry on and do their stuff, they have the knowledge, technology, contacts etc etc and the drive to bring this in and generate shed loads of money to compensate their investment. I don't believe that venture capitalists want companies to fail or no-one would get involved with them but I do think that they tend to want short-term wins.
From a shareholder's perspective, I'd like a quick win but if waiting a little longer gets me a much better return, I'll hang in and back SVFC. If you don't like the situation/PPSs, sell up and get some return off your investment, even if it is less than you initially invested.
That's investing guys, some you win, some you lose....