Summary
Synopsis
Alglucerase is a modified form of human placental glucocerebrosidase used as enzyme replacement therapy for patients with Gaucher s disease, in whom functional glucocerebrosidase is deficient. Alglucerase has provided a breakthrough in treatment for patients with this relatively rare disease. With alglucerase infusions typical disease manifestations are ameliorated or normalised: hepatosplenomegaly is reduced, haematological parameters improve, and patients experience an increased quality of life usually within 4 to 6 months of treatment. Parameters of bone disease also respond, but generally over a longer period of treatment. Alglucerase is well tolerated by children and adults, with few adverse effects reported. Seroconversion occurs in approximately 15% of patients on high—dose therapy, but does not appear to affect the efficacy of treatment.
Several dosage regimens have been used to deliver alglucerase, and the comparative benefits of these remain controversial. High-dose regimens of 60 IU/kg bodyweight administered every 2 weeks are clearly effective; however, smaller dosages given more frequently are also effective and incur a greatly reduced acquisition cost. Patient responses are variable, and the dosage regimen should be tailored to individual needs. Dosage regimens may be considerably reduced for the maintenance phase of treatment, but clinical experience is as yet insufficient to establish the minimum dosages required in the long term.
Acquisition cost of alglucerase is $US3.70 per unit (1994 US dollars); thus, a dosage regimen of60 IU/kg bodyweight administered every 2 weeks for a patient weighing 70kg costs $US404 040 per year. The minimal costs per quality-adjusted life year saved (QALY) have been estimated for 3 dosage regimens over a 10-year periodo Cost per QALY was $US147 000 for 60 IU/kg bodyweight administered every 2 weeks, $US75 000 for 30 IU/kg every 2 weeks, and $US49 000 for 2.3 IU/kg administered 3 times per week. These costs were calculated assuming immediate death with no treatment, which suggests that the actual costs per QALY for most patients with type 1 or 3 disease are likely to be much higher. Drug administration costs may become a significant part of the cost during maintenance therapy; in addition, possible cost savings due to increased patient productivity and reduced palliative treatments remain unresolved.
Although some patients may obtain increased benefit from high-dosage regimens, the very high cost may preclude general use of these regimens. Healthcare resources consumed by alglucerase therapy represent a large opportunity cost for other therapeutic areas. Savings in treatment costs may be achieved by frequent administration of smaller doses in a home environment (to decrease administration costs). Further research to develop less expensive means of manufacturing the enzyme is urgently required, as current acquisition costs may limit treatment to only the most severely affected patients.
In conclusion, enzyme replacement therapy is the most effective and well tolerated treatment available for Gaucher’s disease. However, the cost effectiveness of this expensive treatment has not yet been established.
Disease Considerations
Gaucher’s disease resu1ts from an inherited inability to hydrolyse glucocerebroside, a byproduct of cell membrane metabolismo Excessive storage of glucocerebroside by macrophages results in hepatosplenomegaly (which may be massive), bleeding disorders and bone disease. The rate of splenic enlargement indicates the progression of the disease. Accumulation of glucocerebroside in the spleen contributes to the anaemia, thrombocytopenia and bleeding disorders commonly seen in patients with Gaucher’s disease.
Bone disease is a major source of discomfort and disability. ‘Bone crises’ (periods of intense pain due to bone infarction) require intravenous narcotic analgesia. Failure of bone remodelling, growth retardation and spontaneous fractures may occur as a result of bony pathology. In addition, a number of other body systems may be affected by Gaucher’s disease. Pulmonary, cardiac, renal, and gastrointestinal dysfunction have been reported, as well as lymphadenopathy and yellow-brown skin pigmentation. Fatigue is a common finding, possibly due to a raised resting metabolic rate caused by the accumulation of glucocerebroside.
Three main types ofGaucher’s disease have been identified. Type 1 Gaucher’s disease is characterised by the lack of neurological involvement and a chronic time course. With a prevalence of 1 in 40 000 in the general population and a carrier rate of 1 in 31 in East European Jews (Ashkenazim) in the US, type 1 disease is the most common form, accounting for approximately 99% of cases. Type 2 disease is the most severe neuronopathic form, and generally results in death within the first 2 years of life. Type 3 disease typically begins in early childhood and shares characteristics of both types 1 and 2. Types 2 and 3 are universally rare (≤1 in 100 000 population), except for an isolated group of patients with type 3 disease in Norrbotten, Sweden. Estimates suggest 1780 to 11 200 patients with type 1 disease in the US may be candidates for enzyme replacement therapy.
Therapeutic Efficacy and Tolerability
Alglucerase reduces organ enlargement, improves haematological parameters, and in the long term may improve bone architecture. Typically, improvements in organomegaly are the first to occur, with 20% reduction in liver volume and 35% reduction in splenic volume expected within the first year of treatment. Significant changes are usually evident within the first 6 months of therapy. Haematological parameters are slower to respond, but in most anaemic patients an increase in haemoglobin levels of 15 g/L may be expected in the initial treatment year. Platelet counts in patients with severe thrombocytopenia may double or be expected to normalise in patients with mild thrombocytopenia over the same treatment period. Bone pain usually reduces in severity and frequency within the first year of treatment but radiographical changes in bony architecture are rarely evident within this time-frame. A preliminary report of a single comparative trial between alglucerase and a recombinant enzyme preparation (imiglucerase) indicated that there was no difference in efficacy between these agents.
Alglucerase is generally well tolerated, with infrequent adverse effects usually related to the method of administration (e.g. inflammation at the intravenous catheter site) rather than to the drug itself. Seroconversion occurs in approximately 15% of patients but does not appear to alter the efficacy of alglucerase or necessitate treatment withdrawal. Episodes of pruritus or urticaria during infusion occur rarely and may be prevented with oral antihistamine agents.
Although formal studies have not been performed, patients treated with alglucerase appear to experience improved quality of life. Energy levels rise, and patients are able to resume work or school. Improvements in symptomatology, for example epistaxis, bruising, fatigue and pain, typically precede changes in physical and laboratory parameters.
Pharmacoeconomic Considerafions
The severity of Gaucher’s disease is highly variable and is only partially correlated with the patient’s genotype. Nonetheless, genetic services form an indispensable part of the costs of the disease. Although no specific data are available for the cost of genetic services for patients with Gaucher’s disease, genetic counselling sessions in the US cost between $US45 and $US89 per outpatient visit in 1984.
Other costs of illness may include splenectomy, blood transfusion, analgesia and orthopaedic procedures. Average direct and indirect costs for total hip joint replacement (a procedure frequent1y performed in patients with Gaucher’s disease) were estimated to be $Can9990 (1988 Canadian dollars). These costs are likely to be greater for patients with Gaucher’s disease as the risks of haemorrhage and infection are high in these patients. Charges for splenectomy in children with chronic immunothrombocytic purpura in the US ranged from $US5000 to $US30 000 in 1986. Pamidronic acid therapy has proved useful in alleviating bone disease in preliminary studies. However, cost data for this and other palliative treatments are unavailable.
Bone marrow transplantation has been performed in a limited number of patients with type l and 3 disease. Most surviving patients had subsequent complications that included mild graft-versus-host disease, or cerebral or pulmonary dysfunction. Allogeneic bone marrow transplantation has been estimated to cost between £40 000 and £60 000 in the UK.
Alglucerase is clearly more expensive than other treatment options, as estimated acquisition costs of dosage regimens used in clinical trials vary between $US16 650 and $US133 200 for the initial 6-month treatment period in 1994 (assuming $US3.70 per unit of alglucerase and patient bodyweight of 50kg). These costs do not include administration or monitoring costs, which may add a significant cost to frequent1y-administered low-dosage regimens unless patients can be treated at home. Experience with maintenance therapy is lacking, but it is expected that high dosages will be able to be reduced to 25% of the initial regimen.
Minimal costs per quality-adjusted life year (QALY) for a 10-year treatment period were estimated as $US147 000 for high-dose regimen of alglucerase 60 IU/kg bodyweight administered once every 2 weeks, compared with $US49 000 for alglucerase 2.3 IU/kg administered 3 times per week. These costs included some administration costs but assumed that immediate death would result from no treatment, which suggests that actual costs per QALY for patients with type l disease (which is not usually fatal) would be considerably higher.
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Various sections of the manuscript reviewed by: N.W. Barton, Clinical Investigations Section, Developmental and Metabolic Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, USA; E. Beutler, Department of Molecular and Experimental Medicine, Scripps Research Institute, La Jolla, California, USA; A. Bomford, Institute of Liver Studies, King’s College School of Medicine and Dentistry, London, England; T.M. Cox, Department of Medicine, University of Cambridge School of Clinical Medicine, Addenbrooke’s Hospital, Cambridge, England; C.A. Crabowski, College of Medicine, University of Cincinnati, Cincinnati, USA; R.I. Parker, Department of Pediatrics, School of Medicine, State University of New York at Stony Brook, Stony Brook, New York, USA; O. Ringdén, Department of Transplantation Surgery, Huddinge Hospital, Stockholm, Sweden; Z. Yosipovitch,Department of Orthopedics, Beilinson Medical Center, Sackler School of Medicine, Tel Aviv University, Petah-Tikva, Israel; A. Zimran, Department of Medicine, Shaare Zedek Medical Center, Jerusalem, Israel.
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Whittington, R., Goa, K.L. Alglucerase. Pharmacoeconomics 7, 63–90 (1995). https://doi.org/10.2165/00019053-199507010-00007
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DOI: https://doi.org/10.2165/00019053-199507010-00007