In brief, the dose of the fourth cohort, 30mcg/kg/day, although safe, was not superior to the dose of the third cohort (15mcg/kg/day), so the developer decided to use 15mcg/kg/day as the dose for the upcoming phase 3 study.
Below, I reproduce the tables showing the main results divulged today.
|* Nominal p-value, not adjusted for multiplicity|
** Mean Annualized Growth Velocity change from baseline increases to 2.0 cm/year (50% increase) if one patient who missed majority of doses between 6 and 12 months is excluded
***8 children have non-missing annualized growth velocity at both baseline and 6 months.