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Blood, 1 April 2008, Vol. 111, No. 7, pp. 3531-3539. Prepublished online as a Blood First Edition Paper on January 29, 2008; DOI 10.1182/blood-2007-08-109231.
HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY Response to desmopressin is influenced by the genotype and phenotype in type 1 von Willebrand disease (VWD): results from the European Study MCMDM-1VWD1 Department of Hematology, San Bortolo Hospital, Vicenza, Italy; 2 Department for Coagulation Disorders, University of Lund, Malmö, Sweden and Center for Hemostasis and Thrombosis, Copenhagen University Hospital, Copenhagen, Denmark; 3 Hemophilia and Thrombosis Centre, Foundation Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Maggiore Policlinico Hospital, Mangiagalli Regina Elena and University of Milan, Milan, Italy; 4 The Academic Unit of Haematology, University of Sheffield, Sheffield, United Kingdom; 5 Coagulation Laboratory, Hamburg, Germany; 6 Servicio de Hematologia y Hemoterapia, Hospital Teresa Herrera, La Coruna, Spain; 7 Institut National de la Santè et de la Recherche Médicale, Inserm U143, Paris, France; 8 Laboratoire Français du Fractionnement et des Biotechnologies, Lille, France; 9 Inserm, Nantes, France; 10 University of Lille, Lille, France; 11 Department of Thrombosis and Hemostasis, Leiden University Medical Center, Leiden, The Netherlands; 12 University Medical Center Hamburg-Eppendorf, Department of Pediatric Hematology and Oncology, Hamburg, Germany; 13 Centre for Hemophilia and Thrombosis, University Hospital Skejby, Aarhus, Denmark; 14 Institute of Hematology and Blood Transfusion, Prague, Czech Republic; 15 Department of Pediatrics, University of Lund, Lund, Sweden; 16 Department of Pathology, Leicester Royal Infirmary, Leicester, United Kingdom; and 17 Department of Hematology, Children's Hospital, Birmingham, United Kingdom
We have prospectively evaluated the biologic response to desmopressin in 77 patients with type 1 von Willebrand disease (VWD) enrolled within the Molecular and Clinical Markers for the Diagnosis and Management of type 1 VWD project. Complete response to desmopressin was defined as an increase of both ristocetin cofactor activity (VWF:RCo) and factor VIII coagulant activity (FVIII:C) to 50 IU/dL or higher and partial response as VWF:RCo or FVIII:C lower than 50 IU/dL after infusion, but at least 3-fold the basal level. Complete response was observed in 83% of patients; partial in 13%; and no response in 4%. Patients with some abnormality of VWF multimeric pattern had significantly lower basal FVIII:C and VWF, lower VWF:RCo/Ag ratio, and less complete responses to desmopressin than patients with a normal multimeric pattern (P = .002). Patients with mutations at codons 1130 and 1205 in the D'-D3 domain had the greatest relative increase, but shortest FVIII and VWF half-lives after infusion. Most partial and nonresponsive patients had mutations in the A1-A3 domains. Response to desmopressin in these VWD patients seemed to be associated with the location of the causative mutation. The presence of subtle multimeric abnormalities did not hamper potential clinically useful responses, as in typical type 1 VWD.
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