Ultragenyx's (RARE) XLH Drug Positive In Phase II Study

 | Apr 09, 2017 09:34PM ET

Ultragenyx Pharmaceutical Inc. (NASDAQ:RARE) and its Japanese partner Kyowa Kirin International plc recently announced positive 64-week data from a pediatric phase II study, evaluating its investigational candidate burosumab (KRN23). It is being developed for the treatment of X-linked hypophosphatemia (XLH) in children aged five to twelve years of age.

The multicentre, open-label, dose-finding phase II study (n=52) showed improvement in serum phosphorus levels, rickets, growth rates and other functional outcomes with use of KRN23, sustained through 64 weeks of treatment.

Additionally, a separate phase II study (n=13) evaluating KRN23 patients aged one to five years demonstrated that KRN23 increased serum phosphorus levels in the low normal range.

Ultragenyx’s share price movement shows that the stock has significantly underperformed the Zacks classified Zacks Investment Research

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