The company is very confident in what they have seen thus far in development. We don't know the full picture or science data that is privy only to those in the company or with confidential disclosures. They have hinted several times now about the $$value$$ they see relative to competitors with similar therapies and indications and see big buying potential and acquisition price. Unlikely they would publicly state this repeatedly without a lot of confidence in what they see in the results of the science.
News 
Market Data 
Discover 
