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Homozygous hemoglobinopathy — Clinical Guidelines

Overview

Homozygous familial hypercholesterolemia (HoFH) is a rare genetic disorder characterized by extremely elevated low-density lipoprotein cholesterol (LDL-C) levels from birth, leading to premature atherosclerotic cardiovascular disease 2 3.

Diagnosis

Elevated LDL-C levels from infancy

Family history of early cardiovascular disease

Genetic testing confirming homozygous mutations in LDL receptor gene

Lipid profile analysis including LDL-C, total cholesterol, and triglycerides 2

Management

First-line treatments:

- Combination of maximally tolerated statins - Ezetimibe 3

Adjunctive treatments:

- Proprotein convertase subtilisin/kexin type 9 inhibitors (PCSK9i) 3 - Lomitapide (MTP inhibitor) for additional LDL-C reduction, though with caution due to hepatic and gastrointestinal adverse events 1 3 - Evinacumab (angptl3 inhibitor) for effective LDL-C reduction across HoFH subgroups 3

Lipid apheresis: Recommended for patients not achieving target LDL-C levels with medical therapy, achieving reductions >70% post-treatment 2

Special Populations

Pediatrics: Lipid apheresis is considered when pharmacological treatments fall short; dietary modifications and close monitoring essential 2

Comorbidities: No specific guidance provided in abstracts; management should focus on controlling LDL-C while addressing comorbidities 3

Key Recommendations

Initiate aggressive lipid-lowering therapy early, including statins and ezetimibe, and consider PCSK9 inhibitors or lomitide for additional LDL-C reduction (Evidence: Moderate) 3

Employ lipoprotein apheresis in pediatric and adult patients with HoFH when medical therapy fails to achieve LDL-C targets (Evidence: Expert opinion) 2

Monitor for and manage adverse effects, particularly hepatic and gastrointestinal events, when using lomitapide (Evidence: Moderate) 1 3

References

1 Liu X, Zheng Z, Chen Q, Liu Y, Li S, Wang H. A real-world analysis of Lomitapide-associated adverse events: Data from FAERS and CVAROD. Medicine 2025. link 2 Reijman MD, Kusters DM, Groothoff JW, Arbeiter K, Dann EJ, de Boer LM et al.. Clinical practice recommendations on lipoprotein apheresis for children with homozygous familial hypercholesterolaemia: An expert consensus statement from ERKNet and ESPN. Atherosclerosis 2024. link 3 Gu J, Gupta RN, Cheng HK, Xu Y, Raal FJ. Current treatments for the management of homozygous familial hypercholesterolaemia: a systematic review and commentary. European journal of preventive cardiology 2024. link 4 Leititis JU, Stahl M, Tackmann W, Wick H, Wildberg A. Homozygous hypobetalipoproteinaemia and phenylketonuria. European journal of pediatrics 1985. link

Homozygous hemoglobinopathy