Yeah, I think that this dip in AMRN is market-related. CLDN is down a whopping 80% on a very badly failed phase III, which might be the catalyst for the slide in biotech. When investors see that kind of loss, some get very nervous and start reducing their exposure. (No one can afford too many hits where I lose $4 out of $5 invested.)
You might be surprised, but I have seen sell-offs a few days before good news too. I often wonder if the explanation is that good news does sometimes leak to big funds, and they spread FUD to get an even better price. No evidence, but I would not be surprised.