Enzyme replacement therapy in heterozygous females with Fabry disease: results of a phase IIIB study

F Baehner, C Kampmann, C Whybra, E Miebach, C M Wiethoff, M Beck
Journal of Inherited Metabolic Disease 2003, 26 (7): 617-27
Fabry disease is an X-linked glycosphingolipid storage disorder caused by a deficiency of alpha-galactosidase A. Affected patients experience debilitating neuropathic pain and have premature mortality due to renal failure, cardiovascular disease or cerebrovascular complications. The disease may be X-linked dominant, since most females heterozygous for Fabry disease are affected clinically. We evaluated the safety, efficacy and pharmacokinetics of agalsidase alfa (Replagal) administered intravenously to female patients with Fabry disease in an open-label, single-centre study. Fifteen severely affected patients received agalsidase alfa at 0.2 mg/kg every other week for up to 55 weeks. Agalsidase alfa was safe and well-tolerated in female patients. None of the patients developed antibodies or experienced an infusion reaction to agalsidase alfa. The pharmacokinetic profile of agalsidase alfa in female patients is comparable to the pharmacokinetics of agalsidase alfa in male patients. Mean urine sediment and plasma Gb3 levels decreased from baseline at 13, 27 and 41 weeks. A significant decrease in left ventricular mass from baseline was seen at weeks 27 (p = 0.003) and 41 (p = 0.039), and a significant reduction in QRS durations was seen at week 27 (p = 0.007). Furthermore, there was a significant improvement in quality of life. Renal function did not deteriorate in these 15 female patients over the 13- to 41-week period of observation. We conclude that enzyme replacement therapy with agalsidase alfa was safe and effective in female patients heterozygous for Fabry disease.

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