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Tada H, Takamura M. Toward personalized medicine in patients with familial hypercholesterolemia. Atherosclerosis 2024:118522. [PMID: 38944546 DOI: 10.1016/j.atherosclerosis.2024.118522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2024] [Accepted: 06/14/2024] [Indexed: 07/01/2024]
Affiliation(s)
- Hayato Tada
- Department of Cardiovascular Medicine, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan.
| | - Masayuki Takamura
- Department of Cardiovascular Medicine, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
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Ibrahim S, Hartgers ML, Reeskamp LF, Zuurbier L, Defesche J, Kastelein JJP, Stroes ESG, Hovingh GK, Huijgen R. LDLR variant classification for improved cardiovascular risk prediction in familial hypercholesterolemia. Atherosclerosis 2024:117610. [PMID: 39085000 DOI: 10.1016/j.atherosclerosis.2024.117610] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 05/02/2024] [Accepted: 05/30/2024] [Indexed: 08/02/2024]
Abstract
BACKGROUND AND AIMS Familial hypercholesterolemia (FH) is a genetic disorder marked by high LDL cholesterol and an increased premature coronary artery disease (CAD) risk. Current dichotomous classification of LDL receptor gene (LDLR) variants may inadequately capture patient variability in LDL cholesterol levels and CAD risk. This study assessed a novel approach for determining LDLR variant severity using variant-specific LDL cholesterol percentiles. METHODS Participants of the Dutch FH cascade screening program were screened for 456 LDLR variants. For each LDLR variant carrier, a sex- and age-specific LDL cholesterol percentile was derived from the LDL cholesterol level measured at study entry, i.e. generally from the blood drawn for DNA analysis. These percentiles were used to calculate the mean LDL cholesterol percentile for each variant. Based on the variant-specific LDL cholesterol percentiles, carriers were grouped into the following LDL cholesterol strata: <75th, 75th-88th, 88th-92nd, 92nd-96.5th, 96.5th-98th, and ≥98th percentile. Additionally, variants were categorized into class 1 (LDLR deficient) and non-class 1 (often LDLR defective) variants. CAD risk between carriers in the different LDL cholesterol strata and non-carriers was compared using a Cox proportional hazard model. RESULTS Out of 35,067 participants, 12,485 (36 %) LDLR variant carriers (mean age 38.0 ± 20.0 years, 47.7 % male) were identified. Carriers had a 5-fold higher CAD risk compared with non-carriers. Hazard ratios for CAD increased gradually from 2.2 (95%CI 0.97-5.0) to 12.0 (95%CI 5.5-24.8) across the LDL cholesterol strata. A 7.3-fold and 3.9-fold increased CAD risk was observed in carriers of class 1 and non-class 1 LDLR variants, respectively. CONCLUSIONS This study presents a refined approach for classifying LDLR variants based on their impact on LDL cholesterol levels, allowing for more precise, genotype-specific CAD risk estimation in FH patients compared with traditional methods.
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Affiliation(s)
- Shirin Ibrahim
- Department of Vascular Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - Merel L Hartgers
- Department of Rheumatology, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - Laurens F Reeskamp
- Department of Vascular Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - Linda Zuurbier
- Department of Human Genetics, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - Joep Defesche
- Department of Human Genetics, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - John J P Kastelein
- Department of Vascular Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - Erik S G Stroes
- Department of Vascular Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - G Kees Hovingh
- Department of Vascular Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - Roeland Huijgen
- Department of Internal Medicine, Spaarne Gasthuis, Hoofddorp, the Netherlands.
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Tada H, Nohara A, Usui S, Sakata K, Kawashiri MA, Takamura M. Validation of the 2022 Clinical Diagnostic Criteria of Familial Hypercholesterolemia in Japan. J Atheroscler Thromb 2024; 31:550-558. [PMID: 37967952 PMCID: PMC11079493 DOI: 10.5551/jat.64549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Accepted: 10/01/2023] [Indexed: 11/17/2023] Open
Abstract
AIM In 2022, the Japan Atherosclerosis Society (JAS) has revised its clinical diagnostic criteria of familial hypercholesterolemia (FH) and adopted the use of definite, probable, possible, and unlikely FH according to the Dutch Lipid Clinic Network (DLCN) FH criteria. However, these strata have not been validated and their impact on coronary artery disease (CAD) is yet to be elucidated. METHODS In this study, we retrospectively examined the patients with FH aged ≥ 15 years (N=857, male=431) who were admitted to Kanazawa University Hospital between 2010 and 2022. We assessed the prevalence of patients with a pathogenic variant as FH and odds ratio (OR) of CAD among each group determined by the JAS criteria 2022 for adults. RESULTS In total, 414, 128, 142, and 173 patients were found to have definite, probable, possible, and unlikely FH, respectively, in this population. The prevalences of patients with a pathogenic variant as FH were 77.1%, 28.7%, 13.0%, and 1.2 %, respectively, among the definite, probable, possible, and unlikely FH patients (P-trend <0.001). Compared with the reference group of unlikely FH, patients with definite, probable, and possible FH were noted to have significantly higher adjusted odds of developing CAD (OR, 9.1; 95% confidence interval [CI], 3.2-12.6; P<0.001 and OR, 4.2; 95% CI, 1.7-6.4; P<0.001, and OR, 2.8; 95% CI, 1.2-4.4; P=0.002, respectively). CONCLUSION The new JAS diagnostic criteria for FH have been noted to work well in terms of diagnosing definitive, probable, or possible FH patients. Thus, it is seen to be of great help in terms of risk discrimination.
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Affiliation(s)
- Hayato Tada
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Atsushi Nohara
- Department of Clinical Genetics, Ishikawa Prefectural Central Hospital, Kanazawa, Japan
| | - Soichiro Usui
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Kenji Sakata
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | | | - Masayuki Takamura
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
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Kobayashi J, Minamizuka T, Tada H, Yokote K. Familial hypercholesterolemia with special focus on Japan. Clin Chim Acta 2024; 556:117847. [PMID: 38417778 DOI: 10.1016/j.cca.2024.117847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 02/21/2024] [Accepted: 02/22/2024] [Indexed: 03/01/2024]
Abstract
Familial hypercholesterolemia (FH) is an inherited disorder characterized by increased low-density lipoprotein LDL) cholesterol and atherosclerotic cardiovascular disease. Although initial genetic analysis linked FH to LDL receptor mutations, subsequent work demonstrated that a gain-of-function mutation in the proprotein convertase subtilisin/kexin type 9 (PCSK9), which causes LDL-R degradation, was shown to be the cause of FH. In this review, we describe the history of research on FH, its clinical phenotyping and genotyping and advances in treatment with special focus on Japan.
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Affiliation(s)
- Junji Kobayashi
- Department of Endocrinology, Metabolism, Hematology and Geriatrics, Chiba University; Department of Clinical Laboratory Science, Graduate School of Medical Sciences, Kanazawa University.
| | - Takuya Minamizuka
- Department of Endocrinology, Metabolism, Hematology and Geriatrics, Chiba University
| | - Hayato Tada
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kanazawa University
| | - Koutaro Yokote
- Department of Endocrinology, Metabolism, Hematology and Geriatrics, Chiba University
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Tada H, Kawashiri MA, Nohara A, Sekiya T, Watanabe A, Takamura M. Genetic Counseling and Genetic Testing for Familial Hypercholesterolemia. Genes (Basel) 2024; 15:297. [PMID: 38540356 PMCID: PMC10970256 DOI: 10.3390/genes15030297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 02/15/2024] [Accepted: 02/19/2024] [Indexed: 06/14/2024] Open
Abstract
Familial hypercholesterolemia (FH) is one of the most common autosomal codominant Mendelian diseases. The major complications of FH include tendon and cutaneous xanthomas and coronary artery disease (CAD) associated with a substantial elevation of serum low-density lipoprotein levels (LDL). Genetic counseling and genetic testing for FH is useful for its diagnosis, risk stratification, and motivation for further LDL-lowering treatments. In this study, we summarize the epidemiology of FH based on numerous genetic studies, including its pathogenic variants, genotype-phenotype correlation, prognostic factors, screening, and usefulness of genetic counseling and genetic testing. Due to the variety of treatments available for this common Mendelian disease, genetic counseling and genetic testing for FH should be implemented in daily clinical practice.
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Affiliation(s)
- Hayato Tada
- Division of Cardiovascular Medicine, Kanazawa University Graduate School of Medicine, Kanazawa 920-8640, Japan;
| | - Masa-aki Kawashiri
- Department of Internal Medicine, Kaga Medical Center, Kaga 922-8522, Japan;
| | - Atsushi Nohara
- Department of Clinical Genetics, Ishikawa Prefectural Central Hospital, Kanazawa 920-8530, Japan;
| | - Tomoko Sekiya
- Division of Clinical Genetics, Kanazawa University Hospital, Kanazawa 920-8641, Japan; (T.S.); (A.W.)
| | - Atsushi Watanabe
- Division of Clinical Genetics, Kanazawa University Hospital, Kanazawa 920-8641, Japan; (T.S.); (A.W.)
| | - Masayuki Takamura
- Division of Cardiovascular Medicine, Kanazawa University Graduate School of Medicine, Kanazawa 920-8640, Japan;
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Clarke SL. Does low-density lipoprotein fully explain atherosclerotic risk in familial hypercholesterolemia? Curr Opin Lipidol 2023; 34:52-58. [PMID: 36853849 PMCID: PMC9994798 DOI: 10.1097/mol.0000000000000868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
PURPOSE OF REVIEW Familial hypercholesterolemia (FH) is a monogenic disorder of elevated low-density lipoprotein cholesterol (LDL-C) from birth leading to increased risk for atherosclerotic cardiovascular disease. However, not all carriers of FH variants display an FH phenotype. Despite this fact, FH variants confer increased risk for atherosclerotic disease in population cohorts. An important question to consider is whether measurements of LDL-C can fully account for this risk. RECENT FINDINGS The atherosclerotic risk associated with FH variants is independent of observed adult LDL-C levels. Modeling adult longitudinal LDL-C accounts for more of this risk compared to using a single measurement. Still, even when adjusting for observed longitudinal LDL-C in adult cohorts, FH variant carriers are at increased risk for coronary artery disease. Genetic analyses, observational studies, and clinical trials all suggest that cumulative LDL-C is a critical driver of cardiovascular risk that may not be fully appreciated by routine LDL-C measurements in adulthood. As such, FH variants confer risk independent of adult LDL-C because these variants increase cumulative LDL-C exposure starting from birth. SUMMARY Both research and clinical practice focus on LDL-C measurements in adults, but measurements during adulthood do not reflect lifelong cumulative exposure to LDL-C. Genetic assessments may compliment clinical assessments by better identifying patients who have experienced greater longitudinal LDL-C exposure.
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Affiliation(s)
- Shoa L. Clarke
- Department of Medicine, Division of Cardiovascular Medicine, Stanford University School of Medicine
- Department of Pediatrics, Division of Pediatric Cardiology, Stanford University School of Medicine, Stanford, California, USA
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Tada H, Kojima N, Yamagami K, Nomura A, Nohara A, Usui S, Sakata K, Takamura M, Kawashiri MA. Early Diagnosis and Treatments in Childhood are Associated with Better Prognosis in Patients with Familial Hypercholesterolemia. Am J Prev Cardiol 2022; 12:100434. [PMID: 36439650 PMCID: PMC9685285 DOI: 10.1016/j.ajpc.2022.100434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Revised: 11/12/2022] [Accepted: 11/18/2022] [Indexed: 11/21/2022] Open
Abstract
Objective The early diagnosis and treatment initiation for children with familial hypercholesterolemia (FH) has been recommended in guidelines. However, there is limited data on the impact of early treatments on the prognosis of children with FH. To investigate if the early initiation of lipid-lowering therapies among Japanese pediatric patients with FH reduced the occurrence of cardiovascular disease (CVD) events in them. Methods We retrospectively investigated the occurrence of CVD events (myocardial infarction, unstable angina, or coronary artery revascularization) in patients with FH (N = 1050, male/female = 490/560), including 106 children below 20 years. We compared a variety of phenotypes, including genetic backgrounds, other complications, LDL cholesterol, medical therapies, and their prognoses between the patients’ diagnoses before the age of 20 years (children, mean age = 15 years) and after that age (adults, mean age = 52 years). Overall, 290 patients (27.6%) had a history of prior CVD events. Results The median follow-up duration was 12.6 [9.5–17.9] years. The baseline LDL cholesterol level, 239 mg/dL, dropped to 112 mg/dL with the treatments. The Achilles tendon thickness was significantly lower in children than that of adults (7.2 vs. 8.9 mm, P < 0.001). Over the follow-up duration, 119 CVD events were observed. Importantly, no CVD event was observed in children despite their median LDL cholesterol level at follow-up being significantly higher than that of adults (122 vs. 111 mg/dL, P < 0.001). Conclusion The likelihood of CVD events in those with FH diagnosed and treated in childhood is low.
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Affiliation(s)
- Hayato Tada
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-Machi, Kanazawa 920-8641, Japan
- Corresponding author.
| | - Nobuko Kojima
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-Machi, Kanazawa 920-8641, Japan
| | - Kan Yamagami
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-Machi, Kanazawa 920-8641, Japan
| | - Akihiro Nomura
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-Machi, Kanazawa 920-8641, Japan
| | - Atsushi Nohara
- Department of Clinical Genetics, Ishikawa Prefectural Central Hospital, Kanazawa, Japan
| | - Soichiro Usui
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-Machi, Kanazawa 920-8641, Japan
| | - Kenji Sakata
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-Machi, Kanazawa 920-8641, Japan
| | - Masayuki Takamura
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-Machi, Kanazawa 920-8641, Japan
| | - Masa-aki Kawashiri
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-Machi, Kanazawa 920-8641, Japan
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Tada H, Kojima N, Yamagami K, Nomura A, Nohara A, Usui S, Sakata K, Hayashi K, Fujino N, Takamura M, Kawashiri MA. Impact of Variants of Uncertain Significance of LDL receptor on Phenotypes of Familial Hypercholesterolemia. J Clin Lipidol 2022; 16:863-869. [DOI: 10.1016/j.jacl.2022.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 08/18/2022] [Accepted: 09/19/2022] [Indexed: 10/14/2022]
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