| Monoclonal antibody | |
|---|---|
| Type | Whole antibody |
| Source | Humanized (frommouse) |
| Target | CD20 |
| Clinical data | |
| Trade names | Ocrevus |
| AHFS/Drugs.com | Monograph |
| MedlinePlus | a617026 |
| License data | |
| Pregnancy category | |
| Routes of administration | Intravenous infusion,subcutaneous injection |
| ATC code | |
| Legal status | |
| Legal status | |
| Identifiers | |
| CAS Number | |
| DrugBank |
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| ChemSpider |
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| UNII | |
| KEGG | |
| Chemical and physical data | |
| Formula | C6494H9978N1718O2014S46 |
| Molar mass | 145818.03 g·mol−1 |
 N Y (what is this?) (verify) | |
Ocrelizumab, sold under the brand nameOcrevus, is amedication used for the treatment ofmultiple sclerosis. It is ahumanized anti-CD20monoclonal antibody.[8] It targets CD20 marker onB lymphocytes and is animmunosuppressive drug.[10] Ocrelizumab binds to anepitope that overlaps with the epitope to whichrituximab binds.[10] It is administered byintravenous infusion.[8] Thefixed-dose combinationocrelizumab/hyaluronidase is administered bysubcutaneous injection.[9]
It was approved by the USFood and Drug Administration (FDA) in March 2017,[11] and the first FDA approved drug for the primary progressive form of multiple sclerosis; it was discovered and developed and is marketed byHoffmann–La Roche's subsidiaryGenentech.[12][8] With the approval, the FDA also required the company to conduct severalphase IV clinical trials to better understand whether the medication is safe and effective in young people, cancer risks, and effects on pregnant women and children they might bear.[13] The USFood and Drug Administration (FDA) considers it to be afirst-in-class medication.[14]
In the US, ocrelizumab isindicated for the treatment of relapsing forms of multiple sclerosis, to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease in adults or for the treatment of primary progressive multiple sclerosis in adults.[8]
In the EU, ocrelizumab is indicated for the treatment of adults with relapsing forms of multiple sclerosis with active disease defined by clinical or imaging features and for the treatment of adults with early primary progressive multiple sclerosis in terms of disease duration and level of disability, and with imaging features characteristic of inflammatory activity.[9]
Ocrelizumab should not be used in people withhepatitis 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.[8]
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 heartbeat, headache, and dizziness. One person died fromsystemic 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 inrheumatoid arthritis andlupus were halted because rates of serious infections were too high; these results were not seen in published trials in people with multiple sclerosis, 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.[10]
There is an increased risk of infections of all kinds, including respiratory infections, in people takingimmunosuppressive drugs like ocrelizumab.[8] In clinical trials submitted to the USFood and Drug Administration (FDA), more people taking ocrelizumab got infections than people takingInterferon beta-1a did, including upper and lower respiratory infections, herpes, and hepatitis B reactivation.[8] The risk ofprogressive multifocal leukoencephalopathy, a disease caused by viral infection of the brain, is also increased.[8]
An increased risk of malignancy with ocrelizumab may exist.[8] In controlled trials, malignancies, including breast cancer, occurred more frequently in people treated with ocrelizumab.[8] Breast cancer occurred in 6 of 781 females treated with ocrelizumab for multiple sclerosis in clinical trials.[8] None of 668 females treated in Rebif (interferon beta-1a) or placebo arms of the clinical trials developed breast cancer.[8]
Ocrelizumab is animmunosuppressive drug; it binds toCD20, which is selectively made and membrane expressed byB cells. When ocrelizumab binds to CD20 on B cells, these cells are deleted byantibody-dependent cell-mediated cytotoxicity and, to a lesser extent,complement-dependent cytotoxicity.[10][15]
Ocrelizumab is ahumanized monoclonal antibody that binds to a CD20epitope that overlaps partially with the epitope to whichrituximab binds.[10] 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.[16]
A study ofrituximab in multiple sclerosis with strong results published in 2008, drove interest in B-cell depletion as a strategy to treat multiple sclerosis and has led to extensive off-label use of rituximab to treat primary and relapsing multiple sclerosis.[10][17] Rituximab is a mouse protein, and isimmunogenic in humans, and Genentech and its parent Roche decided to focus on the similar, but humanized mAb that they already had, ocrelizumab, for multiple sclerosis instead.[12]
Clinical trials in people withrheumatoid arthritis andlupus were halted in 2010 because people with these conditions developed too manyopportunistic infections when taking ocrelizumab.[10][18] It was also studied inhematological cancer.[19]
In multiple sclerosis, phase II results were announced in October 2010, and in October 2015,Genentech presented interim results of three Phase III clinical trials.[20] In February 2016, the USFood and Drug Administration (FDA) grantedbreakthrough therapy designation for primary progressive multiple sclerosis.[21]
In March 2017, the FDA approved ocrelizumab for relapsing-remitting and primary-progressivemultiple sclerosis. It is the first FDA-approved treatment for the primary progressive form.[22][11] When the FDA approved the drug, it required Roche to conduct severalPhase 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.[13]
The efficacy of ocrelizumab for the treatment of relapsing forms of multiple sclerosis was shown in two clinical trials in 1,656 participants treated for 96 weeks.[22][23] Both studies compared ocrelizumab to another MS drug, Rebif (interferon beta-1a).[22] In both studies, the participants receiving ocrelizumab had reduced relapse rates and reduced worsening of disability compared to Rebif.[22][23] The trials were conducted in the US, Canada, Europe, Latin America, Africa, and Australia.[23]
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.[22][23] The study was conducted in the US, Canada, and Europe.[23]
The application for ocrelizumab was grantedbreakthrough therapy,fast track, andpriority review designations.[22] The FDA granted approval of Ocrevus to Genentech, Inc.[22]
Ocrelizumab was approved for use in the European Union in January 2018.[9] In June 2024, the European Commission granted marketing authorization for thefixed-dose combinationocrelizumab/hyaluronidase to be used for subcutaneous injection.[9][24] The FDA approved the fixed-dose combination ocrelizumab/hyaluronidase as a subcutaneous formulation in September 2024.[25]
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