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Adenosine Deaminase (ADA)–Deficient Severe Combined Immune Deficiency (SCID) in the US Immunodeficiency Network (USIDNet) Registry

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Abstract

Clinical data from ADA-SCID patients registered in the U.S. Immunodeficiency Network (USIDNet) Repository were analyzed. Sixty-four ADA-SCID patients born between 1981 and 2017 had clinical data entered by their local (or home) enrolling institution. Median age at diagnosis was 1 month for those with a positive family history and 3 months for those without a prior family history, with some diagnosed at birth and one as late as 9 years of age. Overall survival was 79.7%, which increased to 94.1% since 2010. These patients had multiple infections and pulmonary, gastrointestinal, and neurological complications. The majority received enzyme replacement therapy (ERT) at some time, including 88% of those born since 2010. Twenty-six patients underwent allogeneic hematopoietic stem cell transplant (HSCT). HSCT successfully supported survival (17/26, 65%) using a variety of cell sources (bone marrow, mobilized peripheral blood, and cord blood) from sibling, family and unrelated donors. Nineteen patients underwent autologous HSCT with gene therapy (GT) using retroviral and lentiviral vectors and all are surviving. The prognosis for patients with ADA-SCID has continued to improve but these patients do have multiple early and potentially long-term conditions that require medical monitoring and management.

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Acknowledgments

We acknowledge Hannah Wright (USIDNet Research Data Analyst) and Julieann Magnusson (USIDNet Project Manager) for their expertise in data management and aid in obtaining and analyzing the data. We also thank Dr. Mary Ellen Conley and Dr. Vivian Hernandez-Trujillo for providing additional patient information through chart review.

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Correspondence to Caroline Y. Kuo.

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Kuo, C.Y., Garabedian, E., Puck, J. et al. Adenosine Deaminase (ADA)–Deficient Severe Combined Immune Deficiency (SCID) in the US Immunodeficiency Network (USIDNet) Registry. J Clin Immunol 40, 1124–1131 (2020). https://doi.org/10.1007/s10875-020-00857-9

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