Achillion Pharmaceuticals (ACHN) had received Breakthrough Therapy Designation from the FDA for its drug danicopan for the treatment of paroxysmal nocturnal hemoglobinuria ((PNH)). This indication was given because of positive preliminary data, from a phase 2 study, that was released several months ago at a medical meeting. But investors still have a catalyst to look forward to. Final data from the very same phase 2 study is expected in Q4 of 2019. It is not going to be an easy market to go after, for the simple reason that there are a host of competitors