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Interferon beta-1a

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Interferon beta-1a
Clinical data
Trade namesAvonex, Rebif, Plegridy, others
AHFS/Drugs.comProfessional Drug Facts
MedlinePlusa604005
License data
Pregnancy
category
  • AU: D
Routes of
administration		Subcutaneous, intramuscular
ATC code
Legal status
Legal status
Pharmacokinetic data
Elimination half-life10 hrs
Identifiers
  • Human interferon beta
CAS Number
IUPHAR/BPS
DrugBank
ChemSpider
  • none
UNII
KEGG
ChEMBL
Chemical and physical data
FormulaC908H1408N246O252S7
Molar mass20027.14 g·mol−1
 ☒NcheckY (what is this?)  (verify)

Interferon beta-1a (also interferon beta 1-alpha) is a cytokine in the interferon family used to treat multiple sclerosis (MS).[5] It is produced by mammalian cells, while interferon beta-1b is produced in modified E. coli.[6] Some research indicates that interferon injections may result in an 18–38% reduction in the rate of MS relapses.[7]

Interferon beta has not been shown to slow the advance of disability.[8][9][10][11] Interferons are not a cure for MS (there is no known cure); the claim is that interferons may slow the progress of the disease if started early and continued for the duration of the disease.[12]

Medical uses

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Clinically isolated syndrome

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The earliest clinical presentation of relapsing-remitting multiple sclerosis is the clinically isolated syndrome (CIS), that is, a single attack of a single symptom. During a CIS, there is a subacute attack suggestive of demyelination which should be included in the spectrum of MS phenotypes.[13] Treatment with interferons after an initial attack decreases the risk of developing clinical definite MS.[14][15]

Relapsing-remitting MS

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Medications are modestly effective at decreasing the number of attacks in relapsing-remitting multiple sclerosis[16] and in reducing the accumulation of brain lesions, which is measured using gadolinium-enhanced magnetic resonance imaging (MRI).[14] Interferons reduce relapses by approximately 30% and their safe profile make them the first-line treatments.[14] Nevertheless, not all the patients are responsive to these therapies. It is known that 30% of MS patients are non-responsive to Beta interferon.[17] They can be classified in genetic, pharmacological and pathogenetic non-responders.[17] One of the factors related to non-respondance is the presence of high levels of interferon beta neutralizing antibodies. Interferon therapy, and specially interferon beta 1b, induces the production of neutralizing antibodies, usually in the second 6 months of treatment, in 5 to 30% of treated patients.[14] Moreover, a subset of RRMS patients with specially active MS, sometimes called "rapidly worsening MS" are normally non-responders to interferon beta 1a.[18][19]

While more studies of the long-term effects of the drugs are needed,[12][14] existing data on the effects of interferons indicate that early-initiated long-term therapy is safe and it is related to better outcomes.[12]

Side effects

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Injectable medications can produce irritation or bruises at injection site. The bruise depicted was produced by a subcutaneous injection.

Interferon beta-1a is available only in injectable forms, and can cause skin reactions at the injection site that may include cutaneous necrosis. Skin reactions with interferon beta are more common with subcutaneous administration and vary greatly in their clinical presentation.[20] They usually appear within the first month of treatment albeit their frequence and importance diminish after six months of treatment.[20] Skin reactions are more prevalent in women.[20] Mild skin reactions usually do not impede treatment whereas necroses appear in around 5% of patients and lead to the discontinuation of the therapy.[20] Also over time, a visible dent at the injection site due to the local destruction of fat tissue, known as lipoatrophy, may develop, however, this rarely occurs with interferon treatment.[21]

Interferons, a subclass of cytokines, are produced in the body during illnesses such as influenza in order to help fight the infection. They are responsible for many of the symptoms of influenza infections, including fever, muscle aches, fatigue, and headaches.[22] Many patients report influenza-like symptoms hours after taking interferon beta that usually improve within 24 hours, being such symptoms related to the temporary increase of cytokines.[14][20] This reaction tends to disappear after 3 months of treatment and its symptoms can be treated with over-the-counter nonsteroidal anti-inflammatory drugs, such as ibuprofen, that reduce fever and pain.[20] Another common transient secondary effect with interferon-beta is a functional deterioration of already existing symptoms of the disease.[20] Such deterioration is similar to the one produced in MS patients due to heat, fever or stress (Uhthoff's phenomenon), usually appears within 24 hours of treatment, is more common in the initial months of treatment, and may last several days.[20] A symptom specially sensitive to worsening is spasticity.[20] Interferon-beta can also reduce numbers of white blood cells (leukopenia), lymphocytes (lymphopenia) and neutrophils (neutropenia), as well as affect liver function.[20] In most cases these effects are non-dangerous and reversible after cessation or reduction of treatment.[20] Nevertheless, recommendation is that all patients should be monitored through laboratory blood analyses, including liver function tests, to ensure safe use of interferons.[20]

To help prevent injection-site reactions, patients are advised to rotate injection sites and use an aseptic injection technique. Injection devices are available to optimize the injection process. Side effects are often onerous enough that many patients ultimately discontinue taking interferons [citation needed] (or glatiramer acetate, a comparable disease-modifying therapy requiring regular injections).

Mechanism of action

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Interferon beta balances the expression of pro- and anti-inflammatory agents in the brain, and reduces the number of inflammatory cells that cross the blood brain barrier.[23] Overall, therapy with interferon beta leads to a reduction of neuron inflammation.[23] Moreover, it is also thought to increase the production of nerve growth factor and consequently improve neuronal survival.[23] In vitro, interferon beta reduces production of Th17 cells which are a subset of T lymphocytes believed to have a role in the pathophysiology of MS.[24]

A scalable vector graphic of signal transduction pathways
Cytokines, such as interferons, typically activate second messenger systems, like JAK-STAT pathways, as illustrated on the left side of the diagram. Conversely, hormones typically activate different signaling pathways, like G protein-coupled receptors, seen at the top of the figure.

Society and culture

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Brand names

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Avonex

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Avonex was approved in the US in 1996,[25] and in the European Union in 1997, and is registered in more than 80 countries worldwide.[citation needed] It is the leading MS therapy in the US, with around 40% of the overall market, and in the European Union, with around 30% of the overall market.[citation needed] It is produced by the Biogen biotechnology company, originally under competition protection in the US under the Orphan Drug Act.

Avonex is sold in three formulations, a lyophilized powder requiring reconstitution, a pre-mixed liquid syringe kit, and a pen; it is administered via intramuscular injection.[1]

Rebif

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Rebif is a disease-modifying drug (DMD) used to treat multiple sclerosis in cases of clinically isolated syndromes as well as relapsing forms of multiple sclerosis and is similar to the interferon beta protein produced by the human body. It is co-marketed by Merck Serono and Pfizer in the US under an exception to the Orphan Drug Act. [citation needed] It was approved in the European Union in 1998, and in the US in 2002; it has since been approved in more than 90 countries worldwide including Canada and Australia.[citation needed] EMD Serono has had sole rights to Rebif in the US since January 2016.[26][27] Rebif is administered via subcutaneous injection.[2]

Cinnovex

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Cinnovex is the brand name of recombinant Interferon beta-1a, which is manufactured as biosimilar/biogeneric in Iran. It is produced in a lyophilized form and sold with distilled water for injection. Cinnovex was developed at the Fraunhofer Society in collaboration with CinnaGen, and is the first therapeutic protein from a Fraunhofer laboratory to be approved as biogeneric / biosimilar medicine. There are several clinical studies to prove the similarity of CinnoVex and Avonex.[28] A more water-soluble variant is currently being investigated by the Vakzine Projekt Management (VPM) GmbH in Braunschweig, Germany.

Plegridy

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Main article: Peginterferon beta-1a
See also: Multiple_sclerosis_research § Phase_III

Plegridy is a brand name of a pegylated form of Interferon beta-1a. Plegridy's advantage is it only needs injecting once every two weeks.[29]

Betaferon (interferon beta-1b)

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Closely related to interferon beta-1a is interferon beta-1b, which is also indicated for MS, but is formulated with a different dose and administered with a different frequency. Each drug has a different safety/efficacy profile.[30] Interferon beta-1b is marketed only by Bayer in the US as Betaseron, and outside the US as Betaferon.

Economics

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In the United States, as of 2015, the cost is between US$1,284 and US$1,386 per 30 mcg vial.[31] As of 2020, the National Average Drug Acquisition Cost (NADAC) in the United States for Avonex was $6,872.94 for a 30 mcg kit.[32]

Avonex and Rebif are on the top ten best-selling multiple sclerosis drugs of 2013.[33]

It is an example of a specialty drug that would only be available through a specialty pharmacy. This is because it requires a refrigerated chain of distribution and costs $17,000 a year.[34]

No. 2013 Global Sales INN Brand names Companies
1 $4.33 billion Glatiramer acetate Copaxone Teva
2 $3.00 billion Interferon beta 1a Avonex Biogen Idec
3 $2.51 billion Interferon beta 1a Rebif Merck KGaA
4 $1.93 billion Fingolimod Gilenya Novartis
5 $1.41 billion Natalizumab Tysabri Biogen Idec
6 $1.38 billion Interferon beta 1b Betaseron/Betaferon Bayer HealthCare
7 $876 million Dimethyl fumarate Tecfidera Biogen Idec
8 $303 million 4-Aminopyridine Ampyra Acorda Therapeutics
9 $250 million Adrenocorticotropic hormone H.P. Acthar Gel Questcor Pharmaceuticals
10 $221 million Teriflunomide Aubagio Sanofi

Research

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COVID-19

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See also: Coronavirus disease 2019 § Research, and COVID-19 drug repurposing research

Interferon beta-1a administered subcutaneously or intravenously was investigated since March 2020 as a potential treatment in patients hospitalized with COVID-19 in a multinational Solidarity trial (initially in combination with lopinavir) but it did not reduce in-hospital mortality compared to local standard of care.[35]

SNG001, an inhalation formulation of interferon beta-1a, is being developed as a treatment for COVID-19 by Synairgen.[36][37] A pilot trial in hospitalized patients showed higher odds of clinical improvement with SNG001 compared to placebo[38] and in January 2021 a phase 3 trial in this population started.[39]

References

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  2. ^ a b "Rebif- interferon beta-1a kit Rebif Rebidose- interferon beta-1a kit Rebif- interferon beta-1a injection, solution Rebif- interferon beta-1a injection, solution Rebif Rebidose- interferon beta-1a injection, solution". DailyMed. 5 June 2020. Archived from the original on 24 March 2021. Retrieved 1 October 2020.
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  38. ^ Monk PD, Marsden RJ, Tear VJ, Brookes J, Batten TN, Mankowski M, et al. (February 2021). "Safety and efficacy of inhaled nebulised interferon beta-1a (SNG001) for treatment of SARS-CoV-2 infection: a randomised, double-blind, placebo-controlled, phase 2 trial". The Lancet. Respiratory Medicine. 9 (2): 196–206. doi:10.1016/S2213-2600(20)30511-7. PMC 7836724. PMID 33189161.
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