Its up to you, but it sounds like you are a short term trader. If you are in for short term profits (some would call them "False profits", but not me ;)) then you just might want to. Personally I am holding all the way to around $20 and above as long as the story remains the same!
Based on current data, I would call PEB a long term play. This short term spike is simply revaluation of its potential with a lot of risk still built into it. But it seems with every release of information that risk disappears further and further. I have done modelling on PEB that shows that if they were able to grab 50% of the worlds markets in bladder cancer detection, the stock would have a base 7% return valuation of $20 with a growth valuation of $34. And this does not take into account entry into the Asian market, or new products they have in their pipeline (CxColorectal etc).
Of course people can come on and tell me (like they have before) that I am dreaming that PEB will ever be able to get more than 10% of the market share. Despite them having a better, cheaper, more accurate test than anything currently available.
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