| Summary: | Fabry disease is an X-linked lysosomal storage disorder which often presents with renal, cardiac, gastrointestinal, and nervous system abnormalities. Available enzyme replacement therapies have demonstrated efficacy at significantly reducing elevated biomarkers associated with increased disease activity, while improving the clinical symptoms associated with Fabry disease. In two cases with classical Fabry disease, we demonstrate that the initiation of enzyme replacement therapy prior to the onset of overt clinical disease is well tolerated and effectively reduces elevated biomarkers, mitigating unnecessary organ damage that may occur prior to the onset of clinical manifestations of disease. This proactive approach should be considered as a best-practice management strategy which has the potential to significantly improve health outcomes in patients with classical Fabry patients, particularly in the context of newborn screening for Fabry disease. Keywords: Fabry disease, Enzyme replacement, Globotriaosylceramide, Pediatric
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