Well to be honest the jury is still out on perfluorocarbon based blood subs but I can say that, although I did not act on it, I knew every day I took a peek at its trading activity when it was trading up near 1 buck recently and always said to myself, "damn, this is an incredible short". I do not short stocks often, if ever. I would say that I cannot give you any good reasons for the insanely high market cap of 70 million, even now after it has declined by 50%. IMHO, if anyone gets a shot with FDA to move forward with a clinical trial for an HBOC/man-made blood sub, I believe it will be Biopure first (I am biased because I own BPUR shares).
From what I know about the molecular make-up of perfluorocarbons, I am not too sure I would want it in my body. Based on what I've been told it is a teflon based product with a relatively long systemic half-life per its weight, and Oxycyte scavenges and redistributes NO in higher quantities than HBOCs do. PFCs were originally developed as part of the Manhattan Project and the development of the atomic bomb during World War II. They were used to carry away a lot of the heat generated by the atomic reactions. It is more likely than not that having a non-biodegradeable, slippery, teflon based molecule free flowing in the blood stream is not a good thing, mainly because one is not quite sure how it is all ultimately cleared from the body. You don't want this stuff absorbing into the body's tissues. Oxcyte has shown in clincals to also cause significant swelling of the Liver in even moderate doses.
Make your own decisions. I hope that helped.