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Original Article
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Volume 334:763-768 March 21, 1996 Number 12
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Coexistence of Hereditary Homocystinuria and Factor V Leiden — Effect on Thrombosis
Hanna Mandel, M.D., Benjamin Brenner, M.D., Moshe Berant, M.D., Nurith Rosenberg, Ph.D., Naomi Lanir, Ph.D., Cornelis Jakobs, Ph.D., Brian Fowler, Ph.D., and Uri Seligsohn, M.D.

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ABSTRACT

Background Venous and arterial thromboembolism occurs in only about one third of patients homozygous for homocystinuria, which suggests that other, contributory factors are necessary for the development of thrombosis in these patients. Factor V Leiden, an R506Q mutation in the gene coding for factor V, is the most common cause of familial thrombosis and could be a potentiating factor.

Methods We determined activated partial-thromboplastin times in the presence and absence of activated protein C and tested for the factor V Leiden mutation in 45 members of seven unrelated consanguineous kindreds in which at least 1 member was homozygous for homocystinuria.

Results Thrombosis (venous, arterial, or both) occurred in 6 of 11 patients with homocystinuria (age, 0.2 to 8 years). All six also had the factor V Leiden mutation. One patient with prenatally diagnosed homocystinuria who was also heterozygous for factor V Leiden has received warfarin therapy since birth and has not had thrombosis (age, 18 months). Of four patients with homocystinuria who did not have factor V Leiden, none had thrombosis (ages at this writing, 1 to 17 years). Three women who were heterozygous for both homocystinuria and factor V Leiden had recurrent fetal loss and placental infarctions.

Conclusions Patients with concurrent homocystinuria and factor V Leiden can have an increased risk of thrombosis. Screening for factor V Leiden may be indicated in patients with homocystinuria and their family members.


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From the Department of Pediatrics (H.M., M.B.) and the Thrombosis and Hemostasis Unit (B.B., N.L.), Rambam Medical Center, Technion Faculty of Medicine, Haifa, Israel; the Institute of Thrombosis and Hemostasis, Department of Hematology, Sheba Medical Center, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel (N.R., U.S.); Department of Pediatrics, Free University Hospital, Amsterdam (C.J.); and Basel University Children's Hospital, Basel, Switzerland (B.F.).

Address reprint requests to Dr. Mandel at the Department of Pediatrics, Rambam Medical Center, Haifa 31096, Israel.

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Related Letters:

Thrombophilia, Homocystinuria, and Mutation of the Factor V Gene
D'Angelo A., Fermo I., D'Angelo S. V., Quéré I., Lamarti H., Chadefaux-Vekemans B., Mandel H., Brenner B., Berant M.
Extract | Full Text  
N Engl J Med 1996; 335:289-290, Jul 25, 1996. Correspondence

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