Nirsevimab Explained

Type:mab
Mab Type:mab
Source:u
Target:F protein of RSV
Tradename:Beyfortus
Dailymedid:Nirsevimab
Pregnancy Au:B2
Routes Of Administration:Intramuscular
Atc Prefix:J06
Atc Suffix:BD08
Legal Au:S4
Legal Au Comment:[1]
Legal Ca:Rx-only
Legal Ca Comment:/ Schedule D[2] [3] [4]
Legal Uk:POM
Legal Us:Rx-only
Legal Us Comment:[5] [6]
Legal Eu:Rx-only
Legal Eu Comment:[7]
Cas Number:1989556-22-0
Pubchemsubstance:384585358
Drugbank:DB16258
Unii:VRN8S9CW5V
Kegg:D11380
Chembl:4297575
C:6494
H:10060
N:1708
O:2050
S:46

Nirsevimab, sold under the brand name Beyfortus, is a human recombinant monoclonal antibody with activity against respiratory syncytial virus (RSV). It is a respiratory syncytial virus (RSV) F protein‑directed fusion inhibitor that is designed to bind to the fusion protein on the surface of the RSV virus.[8] [9]

The most common side effects are rash, fever and injection site reactions (such as redness, swelling and pain where the injection is given).

It was developed by AstraZeneca and Sanofi.[10] [11] Nirsevimab was approved for medical use in both the European Union and the United Kingdom in November 2022,[12] in Canada in April 2023,[13] and in the United States in July 2023.[14] Alternatively, in October 2023 the CDC recommended maternal RSVpreF vaccination during pregnancy, though both are not needed in most infants.

Medical uses

In the European Union, nirsevimab is indicated for the prevention of respiratory syncytial virus RSV lower respiratory tract disease in neonates and infants during their first RSV season.

In the United States, nirsevimab is indicated for the prevention of RSV lower respiratory tract disease in neonates and infants born during or entering their first RSV season and children up to 24 months of age who remain vulnerable to severe RSV disease through their second RSV season. Alternatively, in October 2023 the CDC recommended maternal RSVpreF vaccination during pregnancy, though both are not needed in most infants.[15]

Adverse effects

No major hypersensitivity reactions have been reported, and adverse events of grade 3 or higher were only reported in 8% (77 of 968) of participants in clinical trial NCT02878330.[8]

Pharmacology

Mechanism of action

Nirsevimab binds to the prefusion conformation of the RSV fusion (F) protein, i.e. it binds to the site at which the virus would attach to a cell; effectively rendering it useless. It has a modified Fc region, extending the half-life of the drug in order for it to last the whole RSV season.[8]

History

The opinion by the Committee for Medicinal Products for Human Use of the European Medicines Agency (EMA) was based on data from two randomized, double-blind, placebo-controlled multicenter clinical trials that investigated the efficacy and safety of nirsevimab in healthy preterm (premature) and full-term infants entering their first RSV season. These studies demonstrated that nirsevimab prevents lower respiratory tract infection caused by RSV requiring medical attention (such as bronchiolitis and pneumonia) in term and preterm infants during their first RSV season.

The safety of nirsevimab was also evaluated in a phase II/III, randomized, double‑blind, multicenter trial in infants who were born five or more weeks prematurely (less than 35 weeks gestation) at higher risk for severe RSV disease and infants with chronic lung disease of prematurity (i.e. long-term respiratory problems faced by babies born prematurely) or congenital heart disease. The results of this study showed that nirsevimab had a similar safety profile compared to palivizumab (Synagis).

The US Food and Drug Administration (FDA) evaluated the safety and efficacy of nirsevimab based on three trials, two of which were randomized, double-blind, placebo-controlled, multicenter clinical trials (Trials 03, 04 and 05). The key measure of efficacy was the incidence of medically attended RSV lower respiratory tract infection (MA RSV LRTI), evaluated during the 150 days after nirsevimab administration. MA RSV LRTI included all health care provider visits (physician office, urgent care, emergency room visits and hospitalization) for lower respiratory tract disease with worsening clinical severity and a positive RSV test.

Trial 03 included 1,453 preterm infants (born at greater than or equal to 29 weeks of gestational age up to less than 35 weeks of gestation) who were born during or entering their first RSV season. Of the 1,453 preterm infants in the trial, 969 received a single dose of nirsevimab and 484 received placebo. Among infants who were treated with nirsevimab, 25 (2.6%) experienced MA RSV LRTI compared with 46 (9.5%) infants who received placebo. nirsevimab reduced the risk of MA RSV LRTI by approximately 70% relative to placebo.

For Trial 04, the primary analysis group within the trial included 1,490 term and late preterm infants (born at greater than or equal to 35 weeks in gestational age), 994 of whom received a single dose of nirsevimab and 496 of whom received placebo. Among infants who were treated with nirsevimab, 12 (1.2%) experienced MA RSV LRTI compared with 25 (5.0%) infants who received placebo. Nirsevimab reduced the risk of MA RSV LRTI by approximately 75% relative to placebo.

Trial 05, a randomized, double-blind, active (palivizumab)-controlled, multicenter trial, supported the use of nirsevimab in children up to 24 months of age who remain vulnerable to severe RSV disease through their second RSV season. The trial enrolled 925 preterm infants and infants with chronic lung disease of prematurity or congenital heart disease. The safety and pharmacokinetic data from Trial 05 provided evidence for the use of nirsevimab to prevent MA RSV LRTI in this population.

The FDA granted the application for nirsevimab a fast track designation. and granted approval of Beyfortus to AstraZeneca.

Society and culture

Legal status

On 15 September 2022, the Committee for Medicinal Products for Human Use of the European Medicines Agency recommended to grant a marketing authorization for Beyfortus for the prevention of RSV lower respiratory tract disease in newborns and infants.[16] Beyfortus was reviewed under EMA's accelerated assessment program. The applicant for this medicinal product is AstraZeneca AB.[17] In November 2022, nirsevimab was approved for medical use in the European Union,[18] [19] and the United Kingdom.[20] It was approved in Canada in April 2023,[13] and in the United States in July 2023.[14]

Research

As of 2022, nirsevimab was investigated as an experimental vaccine against RSV in the general infant population. The MELODY study is an ongoing, randomized, double-blind, placebo-controlled to evaluate the safety and efficacy of nirsevimab in late preterm and term infants. Initial results were promising, with nirsevimab reducing LRTI (lower respiratory tract infections) by 74.5% compared to placebo in infants born at term or late preterm.[21] [22]

As of April 2023, ongoing trials for nirsevimab were:

Notes and References

  1. Web site: Beyfortus APMDS . Therapeutic Goods Administration (TGA) . 8 December 2023 . 7 March 2024 . 7 March 2024 . https://web.archive.org/web/20240307055401/https://www.tga.gov.au/resources/auspmd/beyfortus . live .
  2. Web site: Beyfortus Product information . . 22 October 2009 . 7 August 2023 . 8 August 2023 . https://web.archive.org/web/20230808025106/https://health-products.canada.ca/dpd-bdpp/info?lang=eng&code=102594 . live .
  3. Web site: Summary Basis of Decision for Beyfortus . . 7 June 2023 . 20 August 2023 . 12 January 2024 . https://web.archive.org/web/20240112094904/https://dhpp.hpfb-dgpsa.ca/review-documents/resource/SBD1686249847840 . live .
  4. Web site: Details for: Beyfortus . . 19 April 2023 . 20 August 2023 . 3 March 2024 . https://web.archive.org/web/20240303155516/https://dhpp.hpfb-dgpsa.ca/dhpp/resource/102594 . live .
  5. Web site: Beyfortus- nirsevimab injection . DailyMed . 17 July 2023 . 6 August 2023 . 7 August 2023 . https://web.archive.org/web/20230807014554/https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=2f08fa60-f674-432d-801b-1f9514bd9b39 . live .
  6. Press Release: U.S. CDC Advisory Committee unanimously recommends routine use of Beyfortus (nirsevimab-alip) to protect infants against RSV disease . Sanofi - Aventis Groupe . GlobeNewswire News Room . 3 August 2023 . 7 August 2023 . 8 August 2023 . https://web.archive.org/web/20230808022851/https://www.globenewswire.com/news-release/2023/08/03/2718475/0/en/Press-Release-U-S-CDC-Advisory-Committee-unanimously-recommends-routine-use-of-Beyfortus-nirsevimab-alip-to-protect-infants-against-RSV-disease.html . live .
  7. Web site: Beyfortus EPAR . European Medicines Agency . 23 June 2023 . 6 August 2023 . 1 August 2023 . https://web.archive.org/web/20230801183925/https://www.ema.europa.eu/en/medicines/human/EPAR/beyfortus . live . Text was copied from this source which is copyright European Medicines Agency. Reproduction is authorized provided the source is acknowledged.
  8. Griffin MP, Yuan Y, Takas T, Domachowske JB, Madhi SA, Manzoni P, Simões EA, Esser MT, Khan AA, Dubovsky F, Villafana T, DeVincenzo JP . 6 . Single-Dose Nirsevimab for Prevention of RSV in Preterm Infants . The New England Journal of Medicine . 383 . 5 . 415–425 . July 2020 . 32726528 . 10.1056/NEJMoa1913556 . 220876651 . Nirsevimab Study Group . free . doi .
  9. Hammitt LL, Dagan R, Yuan Y, Baca Cots M, Bosheva M, Madhi SA, Muller WJ, Zar HJ, Brooks D, Grenham A, Wählby Hamrén U, Mankad VS, Ren P, Takas T, Abram ME, Leach A, Griffin MP, Villafana T . 6 . Nirsevimab for Prevention of RSV in Healthy Late-Preterm and Term Infants . The New England Journal of Medicine . 386 . 9 . 837–846 . March 2022 . 35235726 . 10.1056/NEJMoa2110275 . 247220023 . free . doi .
  10. Nirsevimab demonstrated protection against respiratory syncytial virus disease in healthy infants in Phase 3 trial. Sanofi. 26 April 2021. 27 December 2021. 27 December 2021. https://web.archive.org/web/20211227083648/https://www.sanofi.com/en/media-room/press-releases/2021/2021-04-26-08-00-00-2216474. live.
  11. Nirsevimab MELODY Phase III trial met primary endpoint of reducing RSV lower respiratory tract infections in healthy infants. AstraZeneca. 26 April 2021. 27 December 2021. 26 December 2021. https://web.archive.org/web/20211226210046/https://www.astrazeneca.com/media-centre/press-releases/2021/nirsevimab-phase-iii-trial-met-primary-endpoint.html. live.
  12. Web site: Respiratory syncytial virus (RSV) immunisation programme: JCVI advice, 7 June 2023 . Medicines and Healthcare products Regulatory Agency (MHRA) . 22 June 2023 . 7 August 2023 . 11 July 2023 . https://web.archive.org/web/20230711002005/https://www.gov.uk/government/publications/rsv-immunisation-programme-jcvi-advice-7-june-2023/respiratory-syncytial-virus-rsv-immunisation-programme-jcvi-advice-7-june-2023 . live .
  13. Web site: 22 April 2023 . Health Canada approves new antibody drug to help prevent serious RSV in babies . 24 April 2023 . CTVNews . 24 April 2023 . https://web.archive.org/web/20230424005221/https://www.ctvnews.ca/health/health-canada-approves-new-antibody-drug-to-help-prevent-serious-rsv-in-babies-1.6366741 . live .
  14. FDA Approves New Drug to Prevent RSV in Babies and Toddlers . U.S. Food and Drug Administration (FDA) . 19 July 2023 . 19 July 2023 . https://web.archive.org/web/20230719003557/https://www.fda.gov/news-events/press-announcements/fda-approves-new-drug-prevent-rsv-babies-and-toddlers . live .
  15. Fleming-Dutra . Katherine E. . 6 October 2023 . Use of the Pfizer Respiratory Syncytial Virus Vaccine During Pregnancy for the Prevention of Respiratory Syncytial Virus–Associated Lower Respiratory Tract Disease in Infants: Recommendations of the Advisory Committee on Immunization Practices — United States, 2023 . MMWR. Morbidity and Mortality Weekly Report . en-us . 72 . 41 . 1115–1122 . 10.15585/mmwr.mm7241e1 . 0149-2195. free . 37824423 . 10578951 .
  16. New medicine to protect babies and infants from respiratory syncytial virus (RSV) infection . European Medicines Agency (EMA) . 16 September 2022 . 18 September 2022 . 19 September 2022 . https://web.archive.org/web/20220919054512/https://www.ema.europa.eu/en/news/new-medicine-protect-babies-infants-respiratory-syncytial-virus-rsv-infection . live . Text was copied from this source which is copyright European Medicines Agency. Reproduction is authorized provided the source is acknowledged.
  17. Web site: Beyfortus: Pending EC decision . European Medicines Agency (EMA) . 15 September 2022 . 18 September 2022 . 19 September 2022 . https://web.archive.org/web/20220919054642/https://www.ema.europa.eu/en/medicines/human/summaries-opinion/beyfortus . live . Text was copied from this source which is copyright European Medicines Agency. Reproduction is authorized provided the source is acknowledged.
  18. Web site: Beyfortus Product information . Union Register of medicinal products . 3 November 2022 . 6 November 2022 . 6 November 2022 . https://web.archive.org/web/20221106232659/https://ec.europa.eu/health/documents/community-register/html/h1689.htm . live .
  19. Beyfortus approved in the EU for the prevention of RSV lower respiratory tract disease in infants . AstraZeneca . 4 November 2022 . 6 November 2022 . 6 November 2022 . https://web.archive.org/web/20221106231818/https://www.astrazeneca.com/media-centre/press-releases/2022/beyfortus-approved-in-the-eu-for-the-prevention-of-rsv-lower-respiratory-tract-disease-in-infants.html . live .
  20. 9 November 2022 . MHRA Grants Approval of Beyfortus (nirsevimab) for Prevention of RSV Disease in Infants . 13 April 2023 . Sanofi . BusinessWire . 13 April 2023 . https://web.archive.org/web/20230413015835/https://www.businesswire.com/news/home/20221109005601/en/MHRA-Grants-Approval-of-Beyfortus%C2%AE%E2%96%BC-nirsevimab-for-Prevention-of-RSV-Disease-in-Infants . live .
  21. Web site: Pfizer's (PFE) RSV Jab Gets Another Breakthrough Therapy Tag. Nasdaq. Zacks Equity Research. 25 March 2022. 8 April 2022. 8 April 2022. https://web.archive.org/web/20220408104356/https://www.nasdaq.com/articles/pfizers-pfe-rsv-jab-gets-another-breakthrough-therapy-tag. live.
  22. Nirsevimab significantly protected infants against RSV disease in Phase III MELODY trial . AstraZeneca . 3 March 2022 . 6 November 2022 . 27 October 2022 . https://web.archive.org/web/20221027153758/https://www.astrazeneca.com/media-centre/press-releases/2022/nirsevimab-significantly-protected-infants-against-rsv-disease-in-phase-iii-melody-trial.html . live .

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