re: "I do not want to lose $6500 to $7000 but I would hate to miss $12,000 to 50,000 by being out."
LOL, the joys of biotech investing!
You probably wouldn't lose quite that much. Not everyone will sell if the DMC says the DCVax-L trial is futile. At .50-1.00 the stock would be priced like an option, and people will hold on - or even buy - on the chance that DCVax-Direct works, or that the company can monetize DCVax-Prostate. So if we do get bad news, and you want out, you'll be able to salvage a few bucks. It would depend on what the PR said.
But if you can only stand to lose $3,000, then better to own 500 shares than 1,000.