Entdoc, IMHO the key is partnering needs. The FDA does not historically stand in the way of phase III if all safety and efficacy requirements were met in phase I and II in a disease that is a deadly unmet need.
Since this can not be a randomized, placeboed trial which is the gold standard, PPHM must have very clearly delineated guidelines from the FDA and preferably an SPA to make the kind of partnering deal they want.