Document Detail

How can cobalamin injections be spaced in long-term therapy for inborn errors of vitamin B(12) absorption?
MedLine Citation:
PMID:  22854512     Owner:  NLM     Status:  Publisher    
Inborn errors of cobalamin (Cbl, vitamin B(12)) absorption include hereditary intrinsic factor deficiency (HIFD) and Imerslund-Gräsbeck disease (IGD). HIFD is secondary to mutations in the HIF gene while IGD is due to mutations in one of the 2 subunits of the intrinsic factor receptor that is cubilin (CUBN) or amnionless (AMN). These disorders lead to intracellular Cbl depletion which in turn causes megaloblastic bone marrow failure, accumulation of homocysteine and methylmalonic acid (MMA), and methionine depletion. The clinical presentation reflects Cbl deficiency, with gastrointestinal symptoms, pancytopenia, and megaloblastic anemia. Mixed proteinuria, when it is present is strongly suggestive of IGD. Accurate diagnosis is always an emergency because early detection and treatment with life-long parenteral pharmacological doses of hydroxocobalamin are life saving and prevent further deterioration. However, the optimal frequency for cobalamin injections as a maintenance therapy is poorly reported. In order to evaluate the optimal maintenance schedule of cobalamin injections, we retrospectively collected clinical, biological, molecular and treatment data on 7 patients affected with congenital Cbl malabsorption. Unlike previous recommendations, we showed that a maintenance dosage of 1mg cobalamin twice a year was enough to ensure a normal clinical status and keep the hematological and metabolic parameters in the normal range. These data suggest that patients affected with inborn errors of cobalamin absorption may be safely long-term treated with cobalamin injections every 6months with careful follow-up of hematological and metabolic parameters. This maintenance regime is beneficial because the patients' quality of life improves.
Amina Boina Abdallah; Hélène Ogier de Baulny; Renata Kozyraki; Sandrine Passemard; Odile Fenneteau; Sophie Lebon; Odile Rigal; Bettina Mesples; Karima Yacouben; Stéphane Giraudier; Jean-François Benoist; Manuel Schiff
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-20
Journal Detail:
Title:  Molecular genetics and metabolism     Volume:  -     ISSN:  1096-7206     ISO Abbreviation:  Mol. Genet. Metab.     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-8-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9805456     Medline TA:  Mol Genet Metab     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Inc. All rights reserved.
APHP, Reference Center for Inherited Metabolic Disease, Hôpital Robert Debré, F-75019 Paris, France.
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