Estudio primario

No clasificado

The incidence and significance of anti-natalizumab antibodies: results from AFFIRM and SENTINEL.

Año 2007
Revista Neurology
Enlaces DOI , Pubmed

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OBJECTIVE:

To determine the incidence and clinical effects of antibodies that develop during treatment with natalizumab.

METHODS:

In two randomized, double-blind, placebo-controlled studies (natalizumab safety and efficacy in relapsing remitting multiple sclerosis [MS, AFFIRM] and safety and efficacy of natalizumab in combination with interferon beta-1a [INF beta]1a] in patients with relapsing remitting MS [SENTINEL]) of patients with relapsing multiple sclerosis, blood samples were obtained at baseline and every 12 weeks to determine the presence of antibodies against natalizumab. Antibodies to natalizumab were measured using an ELISA. Patients were categorized as "transiently positive" if they had detectable antibodies (>or=0.5 microg/mL) at a single time point or "persistently positive" if they had antibodies at two or more time points >or=6 weeks apart.

RESULTS:

In the AFFIRM study, antibodies were detected in 57 of 625 (9%) of natalizumab-treated patients: Twenty (3%) were transiently positive and 37 (6%) were persistently positive. Persistently positive patients showed a loss of clinical efficacy as measured by disability progression (p <or= 0.05), relapse rate (p = 0.009), and MRI (p <or= 0.05) compared with antibody-negative patients. In transiently positive patients, full efficacy was achieved after approximately 6 months of treatment, the time when patients were becoming antibody negative. The incidence of infusion-related adverse events was significantly higher in persistently positive patients. Results of SENTINEL were similar to AFFIRM, except with regard to sustained disability progression; differences between persistently positive and antibody-negative patients were not statistically significant.

CONCLUSIONS:

The incidence of persistent antibody positivity associated with natalizumab is 6%. Reduced clinical efficacy is apparent in persistently positive patients. Patients with a suboptimal clinical response or persistent infusion-related adverse events should be considered for antibody testing.

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Estudio primario

No clasificado

Progressive multifocal leukoencephalopathy after natalizumab therapy for Crohn's disease.

Año 2005
Revista The New England journal of medicine
Enlaces DOI , Pubmed

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The prior diagnosis of fatal astrocytoma in a 60-year-old man with Crohn's disease treated with natalizumab, a monoclonal antibody against alpha4 integrins, was reclassified as JC virus-related progressive multifocal leukoencephalopathy (PML). Analysis of frozen serum samples showed that JC virus DNA had appeared in the serum three months after the initiation of open-label natalizumab monotherapy and two months before the appearance of symptomatic PML. There was staining of the brain lesion for polyomavirus. This case report, along with two others, suggests that anti-alpha4-integrin therapy can result in JC virus-induced PML.

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Resumen estructurado de revisiones sistemáticas

No clasificado

Natalizumab for the treatment of adults with highly active relapsing-remitting multiple sclerosis

Año 2011
Revista HTA Database
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RECORD STATUS:

None

CITATION:

National Institute for Health and Clinical Excellence. Natalizumab for the treatment of adults with highly active relapsing-remitting multiple sclerosis. London: National Institute for Health and Clinical Excellence (NICE). Technology Appraisal Guidance 127. 2007

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Estudio primario

No clasificado

MRI outcomes in a placebo-controlled trial of natalizumab in relapsing MS.

Año 2007
Revista Neurology
Enlaces DOI , Pubmed

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BACKGROUND:

In a 2-year, placebo-controlled trial (the Natalizumab Safety and Efficacy in Relapsing Remitting Multiple Sclerosis [AFFIRM] study), involving 942 patients with relapsing multiple sclerosis (MS), natalizumab significantly reduced the relapse rate by 68% and progression of sustained disability by 42% vs placebo. We report the effect of natalizumab on MRI measures from the AFFIRM study.

METHODS:

The number and volume of gadolinium (Gd)-enhancing, new or enlarging T2-hyperintense, and new T1-hypointense lesions and brain parenchymal fraction were measured from annual scans obtained at baseline, 1 year, and 2 years.

RESULTS:

Compared with placebo, natalizumab produced a 92% decrease in Gd-enhancing lesions (means 2.4 vs 0.2; p < 0.001), an 83% decrease in new or enlarging T2-hyperintense lesions (means 11.0 vs 1.9; p < 0.001), and a 76% decrease in new T1-hypointense lesions (means 4.6 vs 1.1; p < 0.001) over 2 years. Median T2-hyperintense lesion volume increased by 8.8% in the placebo group and decreased by 9.4% in the natalizumab group (p < 0.001); median T1-hypointense lesion volume decreased by 1.5% in the placebo group and decreased by 23.5% in the natalizumab group (p < 0.001). Brain atrophy was greater in year 1 and less in year 2 in natalizumab-treated patients.

CONCLUSION:

Natalizumab has a sustained effect in preventing the formation of new lesions in patients with relapsing multiple sclerosis.

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Estudio primario

No clasificado

Health-related quality of life during natalizumab maintenance therapy for Crohn's disease.

Año 2007
Revista The American journal of gastroenterology
Enlaces DOI , Pubmed

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OBJECTIVES:

We evaluated the effects of treatment on health-related quality of life (HRQoL) during a randomized controlled trial of natalizumab maintenance therapy (ENACT-2) using both disease-specific and generic measures.

METHODS:

Crohn's disease patients who received natalizumab as induction therapy in ENACT-1 (N=724) and responded (N=339) were re-randomized to ENACT-2 in which they received natalizumab 300 mg (N=168) or placebo (N=171) every 4 wk for 48 additional wk. Outcome measures were the change from baseline on the inflammatory bowel disease questionnaire (IBDQ), the short form-36 (SF-36), the EuroQol-5D (EQ-5D), and a subject global assessment.

RESULTS:

At entry into ENACT-1, scores indicated substantially impaired HRQoL for both the disease-specific and general measures. Natalizumab responders showed clinically meaningful improvement in HRQoL over the course of the ENACT-1 study. During maintenance therapy, IBDQ and SF-36 scale scores of patients who responded to natalizumab induction and were re-randomized to receive the drug in ENACT-2 (N=168) remained stable, while those re-randomized to placebo (N=171) worsened. At week 60, 48 wk after the initiation of maintenance therapy, the mean change from ENACT-1 baseline of all scales of the IBDQ and the SF-36 was significantly higher for those who continued to receive natalizumab (P<0.001 for all scales). The scores of patients who received maintenance natalizumab treatment were not statistically different from those of a cross-section of the U.S. population for 6 of 8 scales of the SF-36.

CONCLUSIONS:

The substantial improvement in HRQoL experienced by patients who responded to natalizumab induction therapy was maintained during an additional 48 wk of maintenance therapy.

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Estudio primario

No clasificado

Cost-effectiveness of natalizumab versus fingolimod for the treatment of relapsing multiple sclerosis.

Año 2011
Revista Journal of medical economics
Enlaces DOI , Pubmed

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BACKGROUND:

With the addition of new agents for the treatment of multiple sclerosis (MS) (e.g., fingolimod), there is a need to evaluate the relative value of newer therapies in terms of cost and effectiveness, given healthcare resource constraints in the United States.

OBJECTIVE:

To assess the cost-effectiveness of natalizumab vs fingolimod in patients with relapsing MS.

METHODS:

A decision analytic model was developed to estimate the incremental cost per relapse avoided of natalizumab and fingolimod from a US managed care payer perspective. Two-year costs of treating patients with MS included drug acquisition costs, administration and monitoring costs, and costs of treating MS relapses. Effectiveness was measured in terms of MS relapses avoided (data from AFFIRM and FREEDOMS trials). One-way and probabilistic sensitivity analyses were conducted to assess uncertainty.

RESULTS:

Mean 2-year estimated treatment costs were $86,461 (natalizumab) and $98,748 (fingolimod). Patients receiving natalizumab had a mean of 0.74 relapses avoided per 2 years vs 0.59 for fingolimod. Natalizumab dominated fingolimod in the incremental cost-effectiveness analysis, as it was less costly and more effective in reducing relapses. One-way sensitivity analysis showed the results of the model were robust to changes in drug acquisition costs, administration costs, and costs of treating MS relapses. Probabilistic sensitivity analysis showed natalizumab was cost-effective 95.1% of the time, at a willingness-to-pay (WTP) threshold of $0 per relapse avoided, increasing to 96.3% of the time at a WTP threshold of $50,000 per relapse avoided.

LIMITATIONS:

Absence of data from direct head-to-head studies comparing natalizumab and fingolimod, use of relapse rate reduction rather than sustained disability progression as primary model outcome, assumption of 100% adherence to MS treatment, and not capturing adverse event costs in the model.

CONCLUSIONS:

Natalizumab dominates fingolimod in terms of incremental cost per relapse avoided, as it is less costly and more effective.

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Estudio primario

No clasificado

Cost effectiveness of glatiramer acetate and natalizumab in relapsing-remitting multiple sclerosis.

Año 2009
Revista Applied health economics and health policy
Enlaces DOI , Pubmed

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BACKGROUND:

Disease-modifying drugs are a significant expenditure for treating multiple sclerosis. Natalizumab (NZ) has been shown to be effective in reducing relapses and disease progression. However, assessment of the cost effectiveness of NZ compared with other disease-modifying drugs in the presence of long-term data has been limited.

OBJECTIVE:

To assess the lifetime cost effectiveness from the US healthcare and societal perspectives of glatiramer acetate (GA) and NZ (both given with symptom management) relative to symptom management alone in patients with relapsing-remitting multiple sclerosis (RRMS) using evidence from long-term published studies.

METHODS:

A Markov model was developed with patients transitioning through health states based on Kurtzke's expanded disability status scale (EDSS). Patients were >/=18 years of age with RRMS, EDSS <6.0 and receiving treatment. Treatment effects were obtained from clinical trials for years 1 and 2 of therapy and long-term clinical assessments thereafter. Transitions were adjusted for discontinuation and persistent NZ antibodies. Patients incurred drug, other medical and lost worker productivity costs. Patient quality of life was considered in the form of utilities, which were taken from assessments of patients with MS. Costs were valued in 2007 $US, and costs and outcomes were discounted at 3% per annum. Various parameters and assumptions were tested in one-way sensitivity analyses, and scenario-based analyses were also performed.

RESULTS:

Remaining lifetime, direct medical costs for patients receiving GA or NZ versus symptom management were $US408 000, $US422 208 and $US341 436, respectively. Patients receiving GA or NZ benefited from increased years in EDSS 0.0-5.5 (1.18 and 1.09, respectively), years relapse-free (1.30 and 1.18) and QALYs (0.1341 and 0.1332). The incremental cost per QALY for GA or NZ compared with symptom management was $US496 222 and $US606 228, respectively, excluding lost worker productivity costs. GA was associated with a cost saving compared with NZ. The incremental cost per QALY results were sensitive to changes in time horizon, disease progression and drug costs. Improved QALYs for NZ were sensitive to changes in the clinical effect of NZ on disease progression and discontinuation over time.

CONCLUSIONS:

GA or NZ in RRMS patients is associated with increased benefits compared with symptom management, albeit at higher costs. Although year 1 and 2 disease progression and relapse rates were better for NZ than GA, long-term evidence may show GA to have similar, if not improved, clinical benefit.

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Resumen estructurado de revisiones sistemáticas

No clasificado

Efficacy and safety of natalizumab for multiple sclerosis and Crohn's disease: a meta analysis

Año 2011
Autores Li YY , Li YP , Sun X , Wang L , Wen J , Cheng L
Revista Database of Abstracts of Reviews of Effects (DARE)
Enlaces

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Este artículo no tiene resumen

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Resumen estructurado de revisiones sistemáticas

No clasificado

Natalizumab for moderate to severely active Crohn's disease - horizon scanning review

Año 2004
Autores NHSC
Revista HTA Database
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RECORD STATUS:

This is a bibliographic record of a published health technology assessment from a member of INAHTA. No evaluation of the quality of this assessment has been made for the HTA database.

CITATION:

NHSC. Natalizumab for moderate to severely active Crohn's disease - horizon scanning review Birmingham: National Horizon Scanning Centre (NHSC). 2004

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Estudio primario

No clasificado

The efficacy of natalizumab in patients with relapsing multiple sclerosis: Subgroup analyses of AFFIRM and SENTINEL

Año 2009
Revista Journal of neurology
Enlaces DOI , Pubmed

Este artículo está incluido en 2 Revisiones sistemáticas Revisiones sistemáticas (2 referencias)

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The AFFIRM and SENTINEL studies showed that natalizumab was effective both as monotherapy and in combination with interferon beta (IFNβ)-1a in patients with relapsing multiple sclerosis (MS). Further analyses of AFFIRM and SENTINEL data were conducted to determine the efficacy of natalizumab in prespecified patient subgroups according to baseline characteristics: relapse history 1 year before randomization (1, 2, 3), Expanded Disability Status Scale score (3.5, > 3.5), number of T2 lesions (< 9, 9), presence of gadolinium-enhancing (Gd+) lesions (0, 1), age (< 40, 40) and gender (male, female). A post hoc analysis was conducted to determine the efficacy of natalizumab in patients with highly active disease (i. e., 2 relapses in the year before study entry and 1 Gd+ lesion at study entry). In both AFFIRM and SENTINEL studies natalizumab reduced the annualized relapse rates across all subgroups (except the small subgroups with < 9 baseline T2 lesions) over 2 years. In AFFIRM, natalizumab significantly reduced the risk of sustained disability progression in most subgroups. In SENTINEL, natalizumab significantly reduced the risk of sustained disability progression in the following subgroups: 9 T2 lesions at baseline, 1 Gd+ lesions at baseline, female patients and patients < 40 years of age. Natalizumab reduced the risk of disability progression by 64 % and relapse rate by 81 % in treatment- naive patients with highly active disease and by 58 % and 76 %, respectively, in patients with highly active disease despite IFNβ-1a treatment. These results indicate that natalizumab is effective in reducing disability progres- sion and relapses in patients with relapsing MS, particularly in patients with highly active disease. © 2009 Steinkopff-Verlag.

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