A Japanese Case of Familial Hypercholesterolemia with a Protein-truncating Variant in LDLR and a PCSK9 Variant without Significant Atherosclerosis but Showing Remarkable Achilles Tendon Thickening

  • Minamizuka Takuya
    Graduate School of Medicine, Chiba University Endocrine Metabolism/Hematology/Geriatric Medicine, Japan
  • Kobayashi Junji
    Graduate School of Medicine, Chiba University Endocrine Metabolism/Hematology/Geriatric Medicine, Japan
  • Tada Hayato
    Graduate School of Medicine, Kanazawa University Cardiovascular Medicine, Japan
  • Koshizaka Masaya
    Graduate School of Medicine, Chiba University Endocrine Metabolism/Hematology/Geriatric Medicine, Japan
  • Maezawa Yoshiro
    Graduate School of Medicine, Chiba University Endocrine Metabolism/Hematology/Geriatric Medicine, Japan
  • Ono Hiraku
    Graduate School of Medicine, Chiba University Endocrine Metabolism/Hematology/Geriatric Medicine, Japan
  • Yokote Koutaro
    Graduate School of Medicine, Chiba University Endocrine Metabolism/Hematology/Geriatric Medicine, Japan

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Description

<p>The patient was a 54-year-old woman with familial hypercholesterolemia and remarkable Achilles tendon thickening. At 20 years old, the patient had a total cholesterol level of approximately 300 mg/dL. She started receiving rosuvastatin (5 mg/day) for low-density lipoprotein cholesterol (LDL-C) 235 mg/dL at 42 years old, which was increased to 10 mg/day at 54 years old, decreasing her serum LDL-C level to approximately 90 mg/dL. The serum Lp (a) level was 9 mg/dL. A computed tomography coronary angiogram showed no significant stenosis. Next-generation sequencing revealed a frameshift variant in LDL receptor (LDLR) (heterozygous) and a missense variant in proprotein convertase subtilisin/kaxin type 9 (PCSK9) (heterozygous). Continued statin therapy, in addition to low Lp (a) and female sex, can help prevent cardiovascular disease. </p>

Journal

  • Internal Medicine

    Internal Medicine 63 (15), 2137-2142, 2024-08-01

    The Japanese Society of Internal Medicine

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