You would think the sheer number of diseases and medical should yield plenty of opportunities to come up with new treatments. Yet there is a worrying lack of new billion-dollar "blockbuster" medicines in the pharma sector.
The recent tragic outbreak of Ebola in West Africa, which showed that there were only a few experimental treatments available for a condition first diagnosed decades before, has shone a light on some of the reasons the pace of innovation in the industry may be slowing.
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