Clinical efficacy and safety of the factor VIII/von Willebrand factor concentrate BIOSTATE (R) in patients with von Willebrand's disease: a prospective multi-centre study
ABSTRACT von Willebrand's disease (VWD) is an inherited bleeding disorder characterized by deficient levels of or dysfunctional von Willebrand factor (VWF). This phase II/III open-label, multicentre study evaluated the efficacy and safety of BIOSTATE, a high purity plasma-derived double-virus inactivated FVIII/VWF concentrate, when used in non-surgical bleeds, surgical procedures and prophylactic therapy in VWD patients for whom desmopressin treatment was deemed ineffective, inadequate or contraindicated. Twenty three patients (7 type 1, 9 type 2 and 7 type 3; 12 male, 11 female), who received FVIII/VWF concentrate as part of their VWD management, were recruited prospectively between December 2004 and May 2007 from eight centres in Australia and New Zealand. BIOSTATE dosing was based on pre-treatment FVIII:C and/or VWF:RCo plasma levels and a predetermined dosing guide. Haemostatic efficacy of BIOSTATE was rated as excellent or good for all major and minor surgery events, long-term prophylaxis, and for four of the six assessable non-surgical bleeding events. Blood transfusions were required by two major surgery patients as well as one patient with a non-surgical bleed. The median overall exposure to BIOSTATE across all groups was 8 days, greater in the prophylactic group (range 53-197) compared with major surgery (3-24), minor surgery (1-8) and non-surgical bleeds (1-10). BIOSTATE was shown to be efficacious and well tolerated when treating patients with VWD. This study also provides important insights into dosing regimens with BIOSTATE and the role of monitoring therapy with FVIII:C and VWF:RCo.
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ABSTRACT: A data-aided (DA) timing recovery method for general continuous phase modulation (CPM) signaling is introduced. This method requires only symbol rate sampling and is independent of the carrier phase offset, owing to the use a differential operator. By examining the phase of the data after the differential operation, we derive an expression of the phase error caused by the timing offset and obtain an efficient timing error function. Then a feedback timing recovery algorithm is developed by exploiting this timing error function. The characteristics of the algorithm are examined through computer simulationVehicular Technology Conference, 1999 IEEE 49th; 08/1999
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ABSTRACT: The availability of plasma-derived and recombinant coagulation factors has transformed the management of patients with bleeding disorders, such as hemophilia and von Willebrand disease (VWD). However, several important clinical challenges remain that have become the focus of current research in coagulation therapy. Two prospective, non-interventional studies (HyQoL-Europe and HyQoL-Canada) are evaluating the impact of major transitional life events, such as changes in social, work and living situations, on the quality of life of adolescents and young adults with hemophilia A who are treated with the recombinant factor VIII (rFVIII) concentrate Helixate®. A better understanding of the impact of these transitional life events on quality of life may help to develop improved interventions and counseling techniques that minimize the negative effects of these events on patients with bleeding disorders. A new clinical development program has been launched to evaluate the safety and efficacy of the low-volume, highly active, plasma-derived von Willebrand factor (VWF)/FVIII concentrate Biostate®. The program, known as SWIFT (Studies with von Willebrand factor/factor VIII) includes four clinical trials involving adult and pediatric patients with hemophilia A or VWD. Lastly, fusion of human recombinant albumin to recombinant coagulation factor IX (rFIX) has created a new fusion protein (rIX-FP) that retains the biological activity of rFIX and has a more favorable pharmacokinetic profile due to the longer half-life. The use of this novel fusion protein may offer several advantages to patients with hemophilia B: less frequent administration, prolonged protection from bleeding and improved compliance--increasing the likelihood of a positive clinical outcome. These examples of current research endeavors are intended to enhance the treatment experience as well as provide new and improved therapies for patients with bleeding disorders.Thrombosis Research 10/2010; 127 Suppl 1:S3-5. DOI:10.1016/j.thromres.2010.10.007 · 2.43 Impact Factor
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ABSTRACT: Factor replacement with BIOSTATE(®), a factor VIII (FVIII)/von Willebrand factor concentrate, forms the mainstay of treatment for children with von Willebrand disorder (VWD) in Australia and New Zealand. However, published data on the clinical efficacy and safety of BIOSTATE in the VWD paediatric population are limited. We retrospectively assessed the efficacy and safety of BIOSTATE in 43 children with VWD who received treatment for surgery, non-surgical bleeds or continuous prophylaxis at eight paediatric haemophilia centres in Australia and New Zealand. Data were collected on patient demographics, disease history, treatment history, dosage, administration, adverse reactions, concomitant medications and excessive bleeding events. BIOSTATE provided excellent/good haemostatic efficacy in 90% of surgical procedures (n = 42) with a mean daily FVIII dose of 47 IU FVIII:C kg(-1) and a median treatment duration of 3 days. Excellent/good haemostatic efficacy was achieved in 94% of non-surgical bleeding events (n = 72) with a mean FVIII dose of 45 IU FVIII:C kg(-1) day(-1) and a median treatment duration of 1 day. There were no bleeding events attributable to lack of efficacy. One case of nausea, possibly related to BIOSTATE administration, was reported. These results suggest that BIOSTATE is safe and effective for the treatment and prophylaxis of bleeding in children with VWD.Haemophilia 12/2010; 17(3):463-9. DOI:10.1111/j.1365-2516.2010.02445.x · 2.47 Impact Factor