An Attempt to Determine the Prevalence of Two Inborn Errors of Primary Bile Acid Synthesis: Results of a European survey.

Abstract

OBJECTIVE: Inborn errors of primary bile acid (BA) synthesis are genetic cholestatic disorders leading to accumulation of atypical BA with deficiency of normal BA. Unless treated with primary BA, chronic liver disease usually progresses to cirrhosis and liver failure before adulthood. We sought to determine the prevalence of two common disorders, 3beta-hydroxy-Delta-C27-steroid dehydrogenase (3beta-HSD) and Delta-3-oxosteroid-5beta-reductase (Delta-3-oxoR) deficiencies and to describe current diagnostic and treatment strategies among different European paediatric hepatology centres. METHODS: 52 clinical paediatric centres were approached and 39 centres in 21 countries agreed to participate in the web based survey. The survey comprised questions regarding general information, number of cases, diagnostic and therapeutic management. RESULTS: 17 centres located in 11 countries reported patients with inborn errors in primary BA synthesis, 22 centres never had cases diagnosed. In total, we could identify 63 patients; 55 with 3beta-HSD and 8 with Delta-3-oxoR deficiency in 21 countries. The minimum estimated combined prevalence of these diseases was 1.13 cases per 10 million (0.99 and 0.14 for 3beta-HSD and Delta-3-oxoR deficiencies, respectively). The surveyed colleagues indicated their main challenges to be the rarity of diseases and the lack of convenient laboratory facilities nearby. CONCLUSION: We have identified the largest cohort of patients with 3beta-HSD or Delta-3-oxoR deficiency described so far. These diseases are likely underdiagnosed mainly due to unawareness of their existence and the lack of laboratory facilities.