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  • Title: Autosomal recessive hypercholesterolaemia: normalization of plasma LDL cholesterol by ezetimibe in combination with statin treatment.
    Author: Lind S, Olsson AG, Eriksson M, Rudling M, Eggertsen G, Angelin B.
    Journal: J Intern Med; 2004 Nov; 256(5):406-12. PubMed ID: 15485476.
    Abstract:
    BACKGROUND: Severe hereditary hypercholesterolaemia is most frequently due to familial hypercholesterolaemia (FH), caused by mutations in the LDL receptor (LDLR) gene. However, a phenotype very similar to FH may also be caused by defects in other genes like the genes for apolipoprotein (apo) B-100 or autosomal recessive hypercholesterolaemia (ARH). SUBJECT: An 8-year-old male of Lebanese origin was diagnosed with severe hypercholesterolaemia and extensive cutaneous and tendon xanthomas. Plasma LDL cholesterol before treatment was 17 mmol L(-1), whilst parents and both siblings had normal levels. DIAGNOSIS: Degradation of (125)I-labelled LDL in blood lymphocytes was reduced, but not abolished. Sequencing analysis of the LDLR and apoB-100 genes were negative, whilst a splice acceptor mutation in intron 1 (IVS 1 -1G>C) was detected in the ARH gene. The patient was homozygous for the mutation, whilst the parents were heterozygous. These findings were in agreement with a diagnosis of ARH. TREATMENT AND CLINICAL COURSE: Monthly LDL apheresis and atorvastatin 120 mg daily reduced LDL cholesterol preapheresis level to 4.8 mmol L(-1). When ezetimibe was given 10 mg day(-1) in combination with rosuvastatin 80 mg day(-1), LDL cholesterol was further lowered to 1.6 mmol L(-1), which made apheresis unnecessary. Cutaneous and tendon xanthomas disappeared completely and the intima-media thickness of the common carotid arteries decreased. At age 23 he developed a small myocardial infarction. CONCLUSION: ARH should be considered in cases of severe hypercholesterolaemia with a pattern of recessive inheritance. Combination therapy with high-dose statin and ezetimibe seems to be the treatment of choice in ARH and may reduce or eliminate the need for LDL apheresis treatment.
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