Monoclonal antibody | |
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Type | Whole antibody |
Source | Humanized (from mouse) |
Target | CD20 |
Clinical data | |
Trade names | Ocrevus |
AHFS/Drugs.com | Monograph |
MedlinePlus | a617026 |
License data |
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Pregnancy category | |
Routes of administration | Intravenous infusion |
ATC code | |
Legal status | |
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Identifiers | |
CAS Number | |
DrugBank | |
ChemSpider |
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UNII | |
KEGG | |
Chemical and physical data | |
Formula | C6494H9978N1718O2014S46 |
Molar mass | 145818.03 g·mol−1 |
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Ocrelizumab, sold under the brand name Ocrevus, is a medication used for the treatment of multiple sclerosis (MS). It is a humanized anti-CD20 monoclonal antibody. [6] It targets CD20 marker on B lymphocytes and is an immunosuppressive drug. [8] Ocrelizumab binds to an epitope that overlaps with the epitope to which rituximab binds. [8]
It was approved by the US Food and Drug Administration (FDA) in March 2017, [9] and the first FDA approved drug for the primary progressive form of MS; it was discovered and developed and is marketed by Hoffmann–La Roche's subsidiary Genentech under the trade name Ocrevus. [10] [6] With the approval, the FDA also required the company to conduct several Phase IV clinical trials to better understand whether the drug is safe and effective in young people, cancer risks, and effects on pregnant women and children they might bear. [11]
The US Food and Drug Administration (FDA) considers it to be a first-in-class medication. [12]
In the US, ocrelizumab is indicated for the treatment of relapsing forms of multiple sclerosis (MS), to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease in adults or for the treatment of primary progressive MS in adults. [6] It is administered by intravenous infusion. [6]
In the EU, ocrelizumab is indicated for the treatment of adults with relapsing forms of multiple sclerosis (RMS) with active disease defined by clinical or imaging features and for the treatment of adults with early primary progressive multiple sclerosis (PPMS) in terms of disease duration and level of disability, and with imaging features characteristic of inflammatory activity. [7]
Ocrelizumab should not be used in people with hepatitis B infection or a history of severe reaction to this drug. If someone has an infection or infectious disease, treatment should be delayed until the infection is resolved. It has not been tested in pregnant women, but based on animal studies does not appear to be safe for pregnant women; it is excreted in breast milk, and effects on infants are unknown. [6]
As of October 2016 the three Phase III clinical trials of ocrelizumab used to obtain approval had not been published. Based on published data from clinical trials at that time, the most common adverse events were infusion reactions including itchy skin, rash, hives, flushing, throat and mouth irritation, fever, fatigue, nausea, rapid heart beating, headache, and dizziness. One person died from a systemic inflammatory response syndrome and in another trial, rates of cancer were three times higher (2.3% vs. 0.8%) in people taking the drug than people taking placebo. Clinical trials in rheumatoid arthritis and lupus were halted because rates of serious infections were too high; these results were not seen in published trials in people with MS, and the differences may be due to the differences in the bodies of people with the different diseases, as well as other drugs they were taking. [8]
There is an increased risk of infections of all kinds, including respiratory infections, in people taking immunosuppressive drugs like ocrelizumab. In clinical trials submitted to the FDA, more people taking ocrelizumab got infections than people taking Interferon beta-1a did, including upper and lower respiratory infections, herpes, and hepatitis B reactivation. The risk of progressive multifocal leukoencephalopathy, a disease caused by viral infection of the brain, is also increased. [6]
An increased risk of malignancy with ocrelizumab may exist. In controlled trials, malignancies, including breast cancer, occurred more frequently in ocrelizumab-treated patients. Breast cancer occurred in 6 of 781 females treated with ocrelizumab for MS in clinical trials. None of 668 females treated in Rebif (interferon beta-1a) or placebo arms of the clinical trials developed breast cancer. Patients should follow standard breast cancer screening guidelines. [6]
Ocrelizumab is an immunosuppressive drug; it binds to CD20, which is selectively made and membrane expressed by B cells. When ocrelizumab binds to CD20 on B cells, these cells are deleted by antibody-dependent cell-mediated cytotoxicity and, to a lesser extent, complement-dependent cytotoxicity. [8] [13]
Ocrelizumab is a humanized monoclonal antibody that binds to a CD20 epitope that overlaps partially with the epitope to which rituximab binds. [8] It has an immunoglobulin G1 with a variable region against human CD20, with a human-mouse monoclonal 2H7 γ1-chain, bound via disulfide links with human-mouse monoclonal 2H7 κ-chain in a dimer. [14]
A study of rituximab in MS with strong results, published in The New England Journal of Medicine in 2008, drove interest in B-cell depletion as a strategy to treat MS and has led to extensive off-label use of rituximab to treat primary and relapsing MS. [8] [15] Rituximab is a mouse protein, and is immunogenic in humans, and Genentech and its parent Roche decided to focus on the similar, but humanized mAb that they already had, ocrelizumab, for MS instead. [10]
Clinical trials in people with rheumatoid arthritis and lupus were halted in 2010 because people with these conditions developed too many opportunistic infections when taking ocrelizumab. [8] [16] It was also studied in hematological cancer. [17]
In MS, phase II results were announced in October 2010, and in October 2015, Genentech presented interim results of three Phase III clinical trials. [18] In February, 2016 the FDA granted Breakthrough Therapy Designation for primary progressive multiple sclerosis. [19]
On March 28, 2017, the FDA approved ocrelizumab for relapsing-remitting and primary-progressive multiple sclerosis. It is the first FDA-approved treatment for the primary progressive form. [20] [9] When the FDA approved the drug, it required Roche to conduct several Phase IV clinical trials, including: a two-part study in people between ten and 17 years old with relapsing multiple sclerosis to determine dosing, then safety and efficacy in these people, required to be completed by 2024; a prospective five-year study to better understand the risk of cancer, required to be completed by 2030; a prospective study creating a registry of women with MS exposed to ocrelizumab before and during pregnancy, women with MS not exposed to ocrelizumab, and women without MS, to understand the effect on women and children they might bear, due by 2029; an additional pregnancy outcomes study due by 2024; and an additional non-human primate study on fetal development and outcomes due by 2019. [11]
The efficacy of ocrelizumab for the treatment of relapsing forms of MS was shown in two clinical trials in 1,656 participants treated for 96 weeks. [20] [21] Both studies compared ocrelizumab to another MS drug, Rebif (interferon beta-1a). [20] In both studies, the patients receiving ocrelizumab had reduced relapse rates and reduced worsening of disability compared to Rebif. [20] [21] The trials were conducted in the US, Canada, Europe, Latin America, Africa, and Australia. [21]
In a study of PPMS in 732 participants treated for at least 120 weeks, those receiving ocrelizumab showed a longer time to the worsening of disability compared to placebo. [20] [21] The study was conducted in the US, Canada, and Europe. [21]
The application for ocrelizumab was granted breakthrough therapy, fast track, and priority review designations. [20] The FDA granted approval of Ocrevus to Genentech, Inc. [20]
Ocrelizumab was approved for use in the European Union in January 2018. [7]
Interferon beta-1a is a cytokine in the interferon family used to treat multiple sclerosis (MS). It is produced by mammalian cells, while interferon beta-1b is produced in modified E. coli. Some research indicates that interferon injections may result in an 18–38% reduction in the rate of MS relapses.
Daclizumab is a therapeutic humanized monoclonal antibody which was used for the treatment of adults with relapsing forms of multiple sclerosis (MS). Daclizumab works by binding to CD25, the alpha subunit of the IL-2 receptor of T-cells.
Rituximab, sold under the brand name Rituxan among others, is a monoclonal antibody medication used to treat certain autoimmune diseases and types of cancer. It is used for non-Hodgkin lymphoma, chronic lymphocytic leukemia, rheumatoid arthritis, granulomatosis with polyangiitis, idiopathic thrombocytopenic purpura, pemphigus vulgaris, myasthenia gravis and Epstein–Barr virus-positive mucocutaneous ulcers. It is given by slow intravenous infusion. Biosimilars of Rituxan include Blitzima, Riabni, Ritemvia, Rituenza, Rixathon, Ruxience, and Truxima.
Cancer immunotherapy (immuno-oncotherapy) is the stimulation of the immune system to treat cancer, improving the immune system's natural ability to fight the disease. It is an application of the fundamental research of cancer immunology and a growing subspecialty of oncology.
Natalizumab, sold under the brand name Tysabri among others, is a medication used to treat multiple sclerosis and Crohn's disease. It is a humanized monoclonal antibody against the cell adhesion molecule α4-integrin. It is given by intravenous infusion. The drug is believed to work by reducing the ability of inflammatory immune cells to attach to and pass through the cell layers lining the intestines and blood–brain barrier.
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Pemphigus vulgaris is a rare chronic blistering skin disease and the most common form of pemphigus. Pemphigus was derived from the Greek word pemphix, meaning blister. It is classified as a type II hypersensitivity reaction in which antibodies are formed against desmosomes, components of the skin that function to keep certain layers of skin bound to each other. As desmosomes are attacked, the layers of skin separate and the clinical picture resembles a blister. These blisters are due to acantholysis, or breaking apart of intercellular connections through an autoantibody-mediated response. Over time the condition inevitably progresses without treatment: lesions increase in size and distribution throughout the body, behaving physiologically like a severe burn.
Multiple sclerosis (MS) is a chronic inflammatory demyelinating disease that affects the central nervous system (CNS). Several therapies for it exist, although there is no known cure.
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Research in multiple sclerosis may find new pathways to interact with the disease, improve function, curtail attacks, or limit the progression of the underlying disease. Many treatments already in clinical trials involve drugs that are used in other diseases or medications that have not been designed specifically for multiple sclerosis. There are also trials involving the combination of drugs that are already in use for multiple sclerosis. Finally, there are also many basic investigations that try to understand better the disease and in the future may help to find new treatments.
Obinutuzumab, sold under the brand name Gazyva among others, is a humanized anti-CD20 monoclonal antibody used as a treatment for cancer. It was originated by GlycArt Biotechnology AG and developed by Roche.
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