An Open-label, Multicenter, Expanded Access Program for Asfotase Alfa (Human Recombinant Tissue-nonspecific Alkaline Phosphatase Fusion Protein) Treatment for Patients With Infantile- or Juvenile-onset Hypophosphatasia (HPP)

This clinical trial is being conducted in Hypophosphatasia, a bone disorder caused by gene mutation(s) resulting in bone defects. These gene mutations cause low levels of an enzyme needed to harden bone. The purpose of this study is to provide access to treatment in a disease where no approved treatment exists. This is an experimental treatment provided under specific treatment guidelines in which safety endpoints will be collected.