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To collect information on the long-term effects of XLH on children and adults who have participated in burosumab clinical trials, adults and children who have not participated in burosumab clinical trials, and who may or may not have been treated with burosumab during the course of the study.

The primary aim of this registry will be to identify genes and/or biologic and environmental factors that either cause these tumors or increase one's risk for developing them. Ultimately, research using this registry may result in improved diagnosis, more effective treatments and possibly prevention.