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Enzyme replacement therapy for Anderson-Fabry disease
Regina P El Dib1, Gregory M Pastores
1Department of Surgery, St. Joseph's Healthcare Hamilton, McMaster University, 50 Charlton Avenue East, Hamilton, ON, Canada, L8N 4A6.
Insights
Enzyme replacement therapy for Anderson-Fabry disease shows limited evidence. Agalsidase alfa did not significantly reduce glycosphingolipid levels, while agalsidase beta demonstrated some improvements in specific markers, but overall trial quality is low.
Area of Science:
- Biochemistry
- Genetics
- Pharmacology
Background:
- Anderson-Fabry disease is an X-linked genetic disorder impacting glycosphingolipid metabolism.
- It leads to progressive renal insufficiency, cardiovascular complications, and reduced survival rates in affected males and carriers.
Purpose of the Study:
- To assess the efficacy and safety of enzyme replacement therapy (ERT) for Anderson-Fabry disease.
- Comparisons were made against placebo, no intervention, or other treatments.
Main Methods:
- A systematic search was conducted across multiple databases including Cochrane Library, MEDLINE, EMBASE, and LILACS.
- Included were randomized controlled trials (RCTs) of agalsidase alfa or beta in patients diagnosed with Anderson-Fabry disease.
Main Results:
- Agalsidase alfa trials showed non-significant changes in glycosphingolipid levels but reported improvements in pain scores and quality of life in some analyses.
- Agalsidase beta trials indicated significant reductions in glycosphingolipid levels in kidney and heart, and for composite endpoints, but not for mortality.
- No deaths were reported in agalsidase alfa trials; pain was not assessed. No significant difference in death was found for agalsidase beta.
Conclusions:
- The current evidence from five small, low-quality RCTs is insufficient to robustly support the use of agalsidase alfa or beta for treating Anderson-Fabry disease.
- Further high-quality research is needed to establish the definitive benefits and risks of ERT in this condition.
Background:
Anderson-Fabry disease is an X-linked defect of glycosphingolipid metabolism. Progressive renal insufficiency is a major source of morbidity, additional complications result from cardio- and cerebro-vascular involvement. Survival is reduced among affected males and symptomatic female carriers.
Objectives:
To evaluate the effectiveness and safety of enzyme replacement therapy compared to other interventions, placebo or no interventions, for treating Anderson-Fabry disease.
Search Strategy:
We searched 'Clinical Trials' on The Cochrane Library, MEDLINE, EMBASE, LILACS and the Cystic Fibrosis and Genetic Disorders Group's Inborn Errors of Metabolism Trials Register (date of the most recent search: 07 April 2010).
Selection Criteria:
Randomized controlled trials of agalsidase alfa or beta in participants diagnosed with Anderson-Fabry disease.
Data Collection And Analysis:
Two authors selected relevant trials, assessed methodological quality and extracted data.
Main Results:
Five studies comparing either agalsidase alfa or beta in 187 participants fulfilled the selection criteria.Both trials comparing agalsidase alfa to placebo reported on globotriaosylceramide concentration in plasma and tissue; aggregate results were non-significant. One study reported pain scores, there was a statistically significant improvement for participants receiving treatment at up to three months, mean difference -2.10 (95% confidence interval (CI) -3.79 to -0.41); at up to five months, mean difference -1.90 (95% CI -3.65 to -0.15); and at up to six months, mean difference -2.00 (95% CI -3.66 to -0.34). There was a significant difference in pain-related quality of life at over five months and up to six months, mean difference -2.10 (95% CI -3.92 to -0.28) but not at other time-points. Neither study reported deaths.One of the three trials comparing agalsidase beta to placebo reported on globotriaosylceramide concentration in plasma and tissue and showed significant improvement: kidney, mean difference -1.70 (95% CI -2.09 to -1.31); heart, mean difference -0.90 (95% CI -1.18 to -0.62); and composite results (renal, cardiac, and cerebrovascular complications and death), mean difference -4.80 (95% CI -5.45 to -4.15). There was no significant difference between groups for death; no studies reported on pain.
Authors' Conclusions:
Five small, poor quality randomised controlled trials provide no robust evidence for use of either agalsidase alfa and beta to treat Anderson-Fabry disease.
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