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Hyperphosphatemic familial tumoral calcinosis (HFTC) is an autosomal recessive metabolic disorder characterized by extensive phenotypic and genetic heterogeneity. HFTC was shown recently to result from mutations in two genes: GALNT3, coding for a glycosyltransferase responsible for initiating O-glycosylation, and FGF23, coding for a potent phosphaturic protein. All GALNT3 mutations reported so far...