If you look at what the price movement from the last couple weeks, you will notice it has sky rocketed. Monday, the PPS rose 44% on no news at all, so I think the PPS is simply correcting itself. I think the selling will dry up by this afternoon and the uptrend will continue tomorrow (just my opinion). I think the run up was due to speculation / anticipation of a partnership announcement with a large Pharma company. The CEO recently stated that the company is in late stage discussions with partners for several of their vaccines, so I'm expecting an announcement any day. We are also expecting Phase 1 HIV results to be released in a Peer Reviewed Scientific Medical Journal and the results are expected to be great.
With that said, I would feel very confident starting a position today. I would also recommend holding through the 1st quarter of next year because that's when Phase 2 results from our lead candidate (HPV) will be released.
And to the guy that said it's a pump and dump... You should seriously consider doing some DD before making such a claim.