Natural History Study of ENPP1 Deficiency and the Early-onset Form of ABCC6 Deficiency

Study INZ701-003 is a multicenter, prospective, longitudinal, observational study to evaluate disease presentation, progression, and burden of illness in pediatric subjects aged 2 to \<18 years with ENPP1 Deficiency and the early-onset form of ABCC6 Deficiency. Subjects will receive care available at the clinical site along with additional assessments administered by the study team. To participate in this study, subjects will give informed assent and parents/guardians will provide informed consent. Subject participation will consist of a Screening Period and an Observation Period. Assessments will be performed at each visit as indicated in the Schedule of Events. During the Screening Period, assessments will be performed to determine eligibility. Screening and Baseline assessments may be conducted on the same day if the Investigator determines that the patient can successfully complete all study procedures in one day due to their age. If not, sites may schedule additional visits, as needed. A subject will be enrolled into the study if they meet all eligibility criteria. During the Observation Period, subjects will be assessed for changes in their disease in the following areas: measurements of physiological function (including laboratory testing and anatomical and radiographical assessment of calcification and bone mineralization); performance outcomes; patient, caregiver, and physician reported outcomes; and healthcare utilization.