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[6-K] GSK plc American Current Report (Foreign Issuer)

Filing Impact
(Low)
Filing Sentiment
(Neutral)
Form Type
6-K
Rhea-AI Filing Summary

Key development: On 14 July 2025 GSK plc filed a Form 6-K reporting that the US FDA has accepted for review a supplemental application to extend the indication of its RSV vaccine, Arexvy, to adults aged 18-49 who have at least one risk factor for severe RSV.

Market opportunity: GSK estimates roughly 21 million US adults under 50 carry comorbidities such as COPD, asthma or heart disease that heighten RSV risk, materially enlarging the vaccine’s current target population (50+ at risk).

Clinical support: The filing is supported by Phase IIIb study NCT06389487 (n = 1,458). In adults 18-49 at increased risk, neutralising antibody titres met non-inferiority to those ≥60 years and safety/reactogenicity matched earlier Phase III data used for initial approval.

Regulatory timeline: FDA decision is expected in H1 2026. Parallel submissions are underway in the EU and Japan, signalling a coordinated global expansion strategy.

Strategic context: Arexvy already holds approval in >60 countries for adults ≥60 and in >50 markets for high-risk adults 50-59. Successful label expansion would secure first-mover advantage in an RSV segment with limited competition and could accelerate revenue growth.

Limitations: The announcement contains no sales guidance; commercial impact remains contingent on regulatory approval, ACIP recommendations and real-world uptake.

Sviluppo chiave: Il 14 luglio 2025 GSK plc ha presentato un modulo 6-K comunicando che la FDA statunitense ha accettato per la revisione una domanda supplementare per estendere l'indicazione del suo vaccino RSV, Arexvy, agli adulti di età compresa tra 18 e 49 anni con almeno un fattore di rischio per forme gravi di RSV.

Opportunità di mercato: GSK stima che circa 21 milioni di adulti statunitensi sotto i 50 anni presentino comorbidità come BPCO, asma o malattie cardiache che aumentano il rischio di RSV, ampliando in modo significativo la popolazione target attuale del vaccino (soggetti a rischio sopra i 50 anni).

Supporto clinico: La richiesta è supportata dallo studio di Fase IIIb NCT06389487 (n = 1.458). Negli adulti 18-49 anni a rischio aumentato, i titoli di anticorpi neutralizzanti hanno dimostrato non inferiorità rispetto a quelli degli over 60 e la sicurezza/reactogenicità è risultata in linea con i dati di Fase III precedenti utilizzati per l'approvazione iniziale.

Tempistiche regolatorie: La decisione FDA è attesa nella prima metà del 2026. Sono in corso presentazioni parallele in UE e Giappone, indicando una strategia coordinata di espansione globale.

Contesto strategico: Arexvy è già approvato in oltre 60 paesi per adulti ≥60 anni e in più di 50 mercati per adulti ad alto rischio tra 50 e 59 anni. Un'espansione dell'indicazione con successo garantirebbe un vantaggio da pioniere in un segmento RSV con competizione limitata e potrebbe accelerare la crescita dei ricavi.

Limitazioni: L'annuncio non contiene previsioni di vendita; l'impatto commerciale dipenderà dall'approvazione regolatoria, dalle raccomandazioni ACIP e dall'adozione nella pratica clinica reale.

Desarrollo clave: El 14 de julio de 2025, GSK plc presentó un Formulario 6-K informando que la FDA de EE. UU. ha aceptado para revisión una solicitud suplementaria para extender la indicación de su vacuna contra el RSV, Arexvy, a adultos de 18 a 49 años que tengan al menos un factor de riesgo para RSV grave.

Oportunidad de mercado: GSK estima que aproximadamente 21 millones de adultos en EE. UU. menores de 50 años presentan comorbilidades como EPOC, asma o enfermedades cardíacas que aumentan el riesgo de RSV, ampliando significativamente la población objetivo actual de la vacuna (mayores de 50 años en riesgo).

Soporte clínico: La solicitud está respaldada por el estudio de fase IIIb NCT06389487 (n = 1,458). En adultos de 18 a 49 años con riesgo aumentado, los títulos de anticuerpos neutralizantes demostraron no inferioridad respecto a los de ≥60 años, y la seguridad/reactogenicidad fue comparable a los datos previos de fase III usados para la aprobación inicial.

Cronograma regulatorio: Se espera la decisión de la FDA en la primera mitad de 2026. Se están realizando presentaciones paralelas en la UE y Japón, señalando una estrategia coordinada de expansión global.

Contexto estratégico: Arexvy ya cuenta con aprobación en más de 60 países para adultos ≥60 años y en más de 50 mercados para adultos de alto riesgo entre 50 y 59 años. Una expansión exitosa de la indicación aseguraría una ventaja de pionero en un segmento RSV con competencia limitada y podría acelerar el crecimiento de ingresos.

Limitaciones: El anuncio no incluye pronósticos de ventas; el impacto comercial dependerá de la aprobación regulatoria, recomendaciones del ACIP y la adopción en el mundo real.

주요 개발 사항: 2025년 7월 14일 GSK plc는 미국 FDA가 RSV 백신 Arexvy의 적응증을 18세에서 49세 사이의 중증 RSV 위험 인자가 있는 성인으로 확장하는 보충 신청서를 검토 대상으로 접수했다고 Form 6-K를 통해 보고했습니다.

시장 기회: GSK는 미국에서 50세 미만 성인 약 2,100만 명이 COPD, 천식 또는 심장 질환과 같은 동반질환을 가지고 있어 RSV 위험이 증가한다고 추산하며, 이는 현재 백신의 목표 대상(50세 이상 위험군)을 크게 확장하는 것입니다.

임상 지원: 이번 신청은 3상 IIIb 연구 NCT06389487(참가자 수 = 1,458)에 의해 뒷받침됩니다. 18-49세 고위험 성인에서 중화항체 역가가 60세 이상과 비교해 비열등성을 보였고, 안전성 및 반응성은 초기 승인에 사용된 이전 3상 데이터와 일치했습니다.

규제 일정: FDA 결정은 2026년 상반기에 예상됩니다. EU와 일본에서도 병행 제출이 진행 중이며, 이는 글로벌 확장 전략의 일환입니다.

전략적 맥락: Arexvy는 이미 60개국 이상에서 60세 이상 성인에게 승인되었고, 50-59세 고위험 성인에 대해서도 50개 이상 시장에서 승인받았습니다. 적응증 확장에 성공하면 경쟁이 제한적인 RSV 분야에서 선도적 위치를 확보하고 매출 성장 가속화가 기대됩니다.

제한 사항: 이번 발표에는 판매 전망이 포함되어 있지 않으며, 상업적 영향은 규제 승인, ACIP 권고 및 실제 사용률에 따라 달라질 수 있습니다.

Événement clé : Le 14 juillet 2025, GSK plc a déposé un formulaire 6-K rapportant que la FDA américaine a accepté d'examiner une demande complémentaire visant à étendre l'indication de son vaccin RSV, Arexvy, aux adultes âgés de 18 à 49 ans présentant au moins un facteur de risque pour une forme sévère de RSV.

Opportunité de marché : GSK estime qu'environ 21 millions d'adultes américains de moins de 50 ans présentent des comorbidités telles que BPCO, asthme ou maladies cardiaques, augmentant ainsi le risque de RSV et élargissant considérablement la population cible actuelle du vaccin (plus de 50 ans à risque).

Soutien clinique : Le dossier est appuyé par l'étude de phase IIIb NCT06389487 (n = 1 458). Chez les adultes de 18 à 49 ans à risque accru, les titres d'anticorps neutralisants ont démontré une non-infériorité par rapport à ceux des ≥60 ans, et la sécurité/réactogénicité était conforme aux données de phase III antérieures utilisées pour l'approbation initiale.

Calendrier réglementaire : La décision de la FDA est attendue au premier semestre 2026. Des soumissions parallèles sont en cours dans l'UE et au Japon, indiquant une stratégie d'expansion mondiale coordonnée.

Contexte stratégique : Arexvy est déjà approuvé dans plus de 60 pays pour les adultes ≥60 ans et dans plus de 50 marchés pour les adultes à haut risque de 50 à 59 ans. Une extension réussie de l'indication assurerait un avantage de premier entrant dans un segment RSV à concurrence limitée et pourrait accélérer la croissance des revenus.

Limitations : L'annonce ne contient aucune prévision de ventes ; l'impact commercial dépendra de l'approbation réglementaire, des recommandations de l'ACIP et de l'adoption dans le monde réel.

Wichtige Entwicklung: Am 14. Juli 2025 reichte GSK plc ein Formular 6-K ein und berichtete, dass die US-amerikanische FDA eine ergänzende Zulassungsanfrage zur Erweiterung der Indikation ihres RSV-Impfstoffs Arexvy für Erwachsene im Alter von 18-49 Jahren mit mindestens einem Risikofaktor für schwere RSV-Erkrankungen zur Prüfung angenommen hat.

Marktchance: GSK schätzt, dass etwa 21 Millionen US-Erwachsene unter 50 Jahren Komorbiditäten wie COPD, Asthma oder Herzkrankheiten aufweisen, die das RSV-Risiko erhöhen, was die derzeitige Zielgruppe des Impfstoffs (über 50 Jahre mit Risiko) erheblich erweitert.

Klinische Unterstützung: Die Einreichung wird durch die Phase-IIIb-Studie NCT06389487 (n = 1.458) gestützt. Bei Erwachsenen im Alter von 18-49 Jahren mit erhöhtem Risiko erreichten die neutralisierenden Antikörpertiter eine Nicht-Unterlegenheitsnachweis gegenüber denen von ≥60-Jährigen, und Sicherheit/Reaktogenität entsprachen den früheren Phase-III-Daten, die für die Erstzulassung verwendet wurden.

Regulatorischer Zeitplan: Die FDA-Entscheidung wird für das erste Halbjahr 2026 erwartet. Parallel laufen Einreichungen in der EU und Japan, was auf eine koordinierte globale Expansionsstrategie hinweist.

Strategischer Kontext: Arexvy ist bereits in über 60 Ländern für Erwachsene ≥60 Jahre und in über 50 Märkten für Hochrisiko-Erwachsene im Alter von 50-59 Jahren zugelassen. Eine erfolgreiche Indikationserweiterung würde einen First-Mover-Vorteil in einem RSV-Segment mit begrenztem Wettbewerb sichern und könnte das Umsatzwachstum beschleunigen.

Beschränkungen: Die Ankündigung enthält keine Umsatzprognosen; die kommerziellen Auswirkungen hängen von der behördlichen Zulassung, ACIP-Empfehlungen und der tatsächlichen Marktdurchdringung ab.

Positive
  • FDA acceptance of the supplemental application to cover high-risk adults 18-49 moves Arexvy closer to an expanded US label.
  • Large addressable population of approximately 21 million US adults offers meaningful incremental revenue potential.
  • Phase IIIb data showed non-inferior immunogenicity and consistent safety, lowering clinical risk.
  • Global expansion efforts in the EU and Japan underline a coordinated growth strategy.
Negative
  • No approval yet; FDA decision not expected until H1 2026, delaying revenue realisation.
  • Regulatory and ACIP uncertainties could restrict the final label or reimbursement, limiting uptake.
  • Absence of financial guidance leaves magnitude and timing of commercial impact unclear.

Insights

TL;DR: FDA review acceptance meaningfully widens Arexvy’s total addressable market; positive for growth momentum but approval risk remains.

The FDA’s willingness to evaluate Arexvy for high-risk adults 18-49 indicates clinical package adequacy and reduces regulatory uncertainty. A 21 million-patient US cohort could add a mid-single-digit billion-dollar sales opportunity by late-decade, assuming moderate uptake and competitive pricing. With Arexvy already commercialised in older populations, GSK benefits from established manufacturing, supply chains and provider familiarity, easing launch execution. Competitive threats from Pfizer and Moderna remain, yet first-mover status and a broader label could fortify share. Overall, the event is clearly impactful, albeit dependent on 2026 approval.

TL;DR: Submission accepted but outcome uncertain; investors should watch safety findings and ACIP stance before revising forecasts.

Acceptance of a supplemental BLA does not guarantee approval. The FDA will scrutinise immunogenicity data, reactogenicity in younger adults and post-marketing safety commitments. Timeline to H1 2026 lengthens visibility, and any label constraints could temper uptake. Additionally, ACIP recommendations will dictate reimbursement and real-world demand. While the news is directionally positive, risk-adjusted value should remain tempered until clearer regulatory signals emerge.

Sviluppo chiave: Il 14 luglio 2025 GSK plc ha presentato un modulo 6-K comunicando che la FDA statunitense ha accettato per la revisione una domanda supplementare per estendere l'indicazione del suo vaccino RSV, Arexvy, agli adulti di età compresa tra 18 e 49 anni con almeno un fattore di rischio per forme gravi di RSV.

Opportunità di mercato: GSK stima che circa 21 milioni di adulti statunitensi sotto i 50 anni presentino comorbidità come BPCO, asma o malattie cardiache che aumentano il rischio di RSV, ampliando in modo significativo la popolazione target attuale del vaccino (soggetti a rischio sopra i 50 anni).

Supporto clinico: La richiesta è supportata dallo studio di Fase IIIb NCT06389487 (n = 1.458). Negli adulti 18-49 anni a rischio aumentato, i titoli di anticorpi neutralizzanti hanno dimostrato non inferiorità rispetto a quelli degli over 60 e la sicurezza/reactogenicità è risultata in linea con i dati di Fase III precedenti utilizzati per l'approvazione iniziale.

Tempistiche regolatorie: La decisione FDA è attesa nella prima metà del 2026. Sono in corso presentazioni parallele in UE e Giappone, indicando una strategia coordinata di espansione globale.

Contesto strategico: Arexvy è già approvato in oltre 60 paesi per adulti ≥60 anni e in più di 50 mercati per adulti ad alto rischio tra 50 e 59 anni. Un'espansione dell'indicazione con successo garantirebbe un vantaggio da pioniere in un segmento RSV con competizione limitata e potrebbe accelerare la crescita dei ricavi.

Limitazioni: L'annuncio non contiene previsioni di vendita; l'impatto commerciale dipenderà dall'approvazione regolatoria, dalle raccomandazioni ACIP e dall'adozione nella pratica clinica reale.

Desarrollo clave: El 14 de julio de 2025, GSK plc presentó un Formulario 6-K informando que la FDA de EE. UU. ha aceptado para revisión una solicitud suplementaria para extender la indicación de su vacuna contra el RSV, Arexvy, a adultos de 18 a 49 años que tengan al menos un factor de riesgo para RSV grave.

Oportunidad de mercado: GSK estima que aproximadamente 21 millones de adultos en EE. UU. menores de 50 años presentan comorbilidades como EPOC, asma o enfermedades cardíacas que aumentan el riesgo de RSV, ampliando significativamente la población objetivo actual de la vacuna (mayores de 50 años en riesgo).

Soporte clínico: La solicitud está respaldada por el estudio de fase IIIb NCT06389487 (n = 1,458). En adultos de 18 a 49 años con riesgo aumentado, los títulos de anticuerpos neutralizantes demostraron no inferioridad respecto a los de ≥60 años, y la seguridad/reactogenicidad fue comparable a los datos previos de fase III usados para la aprobación inicial.

Cronograma regulatorio: Se espera la decisión de la FDA en la primera mitad de 2026. Se están realizando presentaciones paralelas en la UE y Japón, señalando una estrategia coordinada de expansión global.

Contexto estratégico: Arexvy ya cuenta con aprobación en más de 60 países para adultos ≥60 años y en más de 50 mercados para adultos de alto riesgo entre 50 y 59 años. Una expansión exitosa de la indicación aseguraría una ventaja de pionero en un segmento RSV con competencia limitada y podría acelerar el crecimiento de ingresos.

Limitaciones: El anuncio no incluye pronósticos de ventas; el impacto comercial dependerá de la aprobación regulatoria, recomendaciones del ACIP y la adopción en el mundo real.

주요 개발 사항: 2025년 7월 14일 GSK plc는 미국 FDA가 RSV 백신 Arexvy의 적응증을 18세에서 49세 사이의 중증 RSV 위험 인자가 있는 성인으로 확장하는 보충 신청서를 검토 대상으로 접수했다고 Form 6-K를 통해 보고했습니다.

시장 기회: GSK는 미국에서 50세 미만 성인 약 2,100만 명이 COPD, 천식 또는 심장 질환과 같은 동반질환을 가지고 있어 RSV 위험이 증가한다고 추산하며, 이는 현재 백신의 목표 대상(50세 이상 위험군)을 크게 확장하는 것입니다.

임상 지원: 이번 신청은 3상 IIIb 연구 NCT06389487(참가자 수 = 1,458)에 의해 뒷받침됩니다. 18-49세 고위험 성인에서 중화항체 역가가 60세 이상과 비교해 비열등성을 보였고, 안전성 및 반응성은 초기 승인에 사용된 이전 3상 데이터와 일치했습니다.

규제 일정: FDA 결정은 2026년 상반기에 예상됩니다. EU와 일본에서도 병행 제출이 진행 중이며, 이는 글로벌 확장 전략의 일환입니다.

전략적 맥락: Arexvy는 이미 60개국 이상에서 60세 이상 성인에게 승인되었고, 50-59세 고위험 성인에 대해서도 50개 이상 시장에서 승인받았습니다. 적응증 확장에 성공하면 경쟁이 제한적인 RSV 분야에서 선도적 위치를 확보하고 매출 성장 가속화가 기대됩니다.

제한 사항: 이번 발표에는 판매 전망이 포함되어 있지 않으며, 상업적 영향은 규제 승인, ACIP 권고 및 실제 사용률에 따라 달라질 수 있습니다.

Événement clé : Le 14 juillet 2025, GSK plc a déposé un formulaire 6-K rapportant que la FDA américaine a accepté d'examiner une demande complémentaire visant à étendre l'indication de son vaccin RSV, Arexvy, aux adultes âgés de 18 à 49 ans présentant au moins un facteur de risque pour une forme sévère de RSV.

Opportunité de marché : GSK estime qu'environ 21 millions d'adultes américains de moins de 50 ans présentent des comorbidités telles que BPCO, asthme ou maladies cardiaques, augmentant ainsi le risque de RSV et élargissant considérablement la population cible actuelle du vaccin (plus de 50 ans à risque).

Soutien clinique : Le dossier est appuyé par l'étude de phase IIIb NCT06389487 (n = 1 458). Chez les adultes de 18 à 49 ans à risque accru, les titres d'anticorps neutralisants ont démontré une non-infériorité par rapport à ceux des ≥60 ans, et la sécurité/réactogénicité était conforme aux données de phase III antérieures utilisées pour l'approbation initiale.

Calendrier réglementaire : La décision de la FDA est attendue au premier semestre 2026. Des soumissions parallèles sont en cours dans l'UE et au Japon, indiquant une stratégie d'expansion mondiale coordonnée.

Contexte stratégique : Arexvy est déjà approuvé dans plus de 60 pays pour les adultes ≥60 ans et dans plus de 50 marchés pour les adultes à haut risque de 50 à 59 ans. Une extension réussie de l'indication assurerait un avantage de premier entrant dans un segment RSV à concurrence limitée et pourrait accélérer la croissance des revenus.

Limitations : L'annonce ne contient aucune prévision de ventes ; l'impact commercial dépendra de l'approbation réglementaire, des recommandations de l'ACIP et de l'adoption dans le monde réel.

Wichtige Entwicklung: Am 14. Juli 2025 reichte GSK plc ein Formular 6-K ein und berichtete, dass die US-amerikanische FDA eine ergänzende Zulassungsanfrage zur Erweiterung der Indikation ihres RSV-Impfstoffs Arexvy für Erwachsene im Alter von 18-49 Jahren mit mindestens einem Risikofaktor für schwere RSV-Erkrankungen zur Prüfung angenommen hat.

Marktchance: GSK schätzt, dass etwa 21 Millionen US-Erwachsene unter 50 Jahren Komorbiditäten wie COPD, Asthma oder Herzkrankheiten aufweisen, die das RSV-Risiko erhöhen, was die derzeitige Zielgruppe des Impfstoffs (über 50 Jahre mit Risiko) erheblich erweitert.

Klinische Unterstützung: Die Einreichung wird durch die Phase-IIIb-Studie NCT06389487 (n = 1.458) gestützt. Bei Erwachsenen im Alter von 18-49 Jahren mit erhöhtem Risiko erreichten die neutralisierenden Antikörpertiter eine Nicht-Unterlegenheitsnachweis gegenüber denen von ≥60-Jährigen, und Sicherheit/Reaktogenität entsprachen den früheren Phase-III-Daten, die für die Erstzulassung verwendet wurden.

Regulatorischer Zeitplan: Die FDA-Entscheidung wird für das erste Halbjahr 2026 erwartet. Parallel laufen Einreichungen in der EU und Japan, was auf eine koordinierte globale Expansionsstrategie hinweist.

Strategischer Kontext: Arexvy ist bereits in über 60 Ländern für Erwachsene ≥60 Jahre und in über 50 Märkten für Hochrisiko-Erwachsene im Alter von 50-59 Jahren zugelassen. Eine erfolgreiche Indikationserweiterung würde einen First-Mover-Vorteil in einem RSV-Segment mit begrenztem Wettbewerb sichern und könnte das Umsatzwachstum beschleunigen.

Beschränkungen: Die Ankündigung enthält keine Umsatzprognosen; die kommerziellen Auswirkungen hängen von der behördlichen Zulassung, ACIP-Empfehlungen und der tatsächlichen Marktdurchdringung ab.

 
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
 
Form 6-K
 
REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16
UNDER THE SECURITIES EXCHANGE ACT OF 1934
 
 
 
For the month of July 2025
 
Commission File Number 001-15170
 
 
GSK plc
(Translation of registrant's name into English)
 
 
79 New Oxford Street, London, WC1A 1DG
(Address of principal executive office)
 
 
 
Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.
 
Form 20-F . . . .X. . . . Form 40-F . . . . . . . .
 
 
Issued: 14 July 2025, London UK
 
US FDA accepts application to review expanded use of GSK's RSV vaccine, Arexvy, for adults 18-49 at increased risk

●      More than 21 million US adults under the age of 50 have at least one risk factor for severe RSV infection1
●      Submission supported by positive Phase IIIb data showing immune response and safety results in this population
●      FDA decision anticipated H1 2026
 
 
GSK plc (LSE/NYSE: GSK) today announced that the US Food and Drug Administration (FDA) has accepted for review an application to extend the indication of Arexvy (respiratory syncytial virus (RSV) vaccine, adjuvanted) to adults aged 18-49 who are at increased risk. GSK's RSV vaccine is approved in the US for the prevention of lower respiratory tract disease (LRTD) caused by RSV in adults aged 60 and older, and for those aged 50-59 years who are at increased risk.
 
RSV is a common contagious virus affecting the lungs and breathing passages and impacts an estimated 64 million people of all ages globally every year.2 More than 125 million adults in the US are under 50 years of age.1 An estimated 21 million of these people have at least one diagnosed risk factor for severe RSV infection, such as chronic obstructive pulmonary disease (COPD), asthma, congestive heart failure and coronary heart disease (CHD).1 RSV can exacerbate certain medical conditions and can also lead to severe illness resulting in hospitalisation, and even death.3 4 5
 
This regulatory submission is supported by a phase IIIb trial evaluating immune response and safety in adults aged 18-49 at increased risk compared to adults aged 60 and above.6 The safety and reactogenicity data were consistent with results from the phase III programme that supported the initial approval of the vaccine in the US.
 
A regulatory decision by the FDA on this submission is expected in H1 2026.
 
GSK is continuing to seek expanded indications for its RSV vaccine in other geographies including in the European Economic Area and Japan.
 
About GSK's RSV vaccine
Respiratory Syncytial Virus Vaccine, Adjuvanted, contains recombinant RSV glycoprotein F stabilised in the prefusion conformation (RSVPreF3). This antigen is combined with GSK's proprietary AS01E adjuvant.
 
The FDA has approved GSK's RSV vaccine for the prevention of lower respiratory tract disease (LRTD) caused by respiratory syncytial virus (RSV) in individuals 60 years of age and older, and those aged 50-59 who are at increased risk. The use of this vaccine should be in accordance with official recommendations. As with any vaccine, a protective immune response may not be elicited in all vaccinees.
 
The vaccine has been approved for the prevention of RSV-LRTD in individuals 60 years of age and older in more than 60 countries. In addition, it is approved for use in individuals aged 50-59 who are at increased risk in more than 50 markets, including the US, Japan and Europe.
 
Please refer to the full US Prescribing Information (PI) for important dosage, administration, and safety information: https://gskpro.com/content/dam/global/hcpportal/en_US/Prescribing_Information/Arexvy/pdf/AREXVY.PDF
 
The AS01 adjuvant system, owned by GSK, includes the QS-21 adjuvant, licensed by Antigenics, a wholly owned subsidiary of Agenus.
 
About the NCT06389487 trial
NCT06389487 is a phase IIIb open-label study to evaluate the non-inferiority of the immune response and to evaluate the safety of GSK's RSV vaccine in adults aged 18-49 at increased risk for RSV disease (n=426) compared to adults aged 60 and older (n=429). An additional cohort of 603 participants aged 18-49 were followed up for adverse events separate to safety follow up of the initial cohort. 1,458 participants were enrolled across 52 locations in 6 countries, including 16 US sites.
 
The trial's co-primary endpoints were RSV-A and RSV-B neutralisation titres expressed as geometric mean titre ratio (relative to older adults over adults at increased risk) and seroresponse rate in RSV-A and RSV-B neutralising titres one month post vaccine administration. There were also safety and immunogenicity secondary endpoints.
 
About RSV in adults
RSV is a common contagious virus affecting the lungs and breathing passages and impacts an estimated 64 million people of all ages globally every year.2 Adults can be at increased risk for RSV disease due to certain comorbidities, immune compromised status, or advanced age.5 RSV can exacerbate conditions, including COPD, asthma, and chronic heart failure and can lead to severe outcomes, such as pneumonia, hospitalisation, and death.5
 
About GSK
GSK is a global biopharma company with a purpose to unite science, technology, and talent to get ahead of disease together. Find out more at gsk.com.
 
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Cautionary statement regarding forward-looking statements
GSK cautions investors that any forward-looking statements or projections made by GSK, including those made in this announcement, are subject to risks and uncertainties that may cause actual results to differ materially from those projected. Such factors include, but are not limited to, those described in the "Risk Factors" section in GSK's Annual Report on Form 20-F for 2024, and GSK's Q1 Results for 2025.
 
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Note:
Among adults aged 20-49 years in the US, a total of 17.0% (N=21 million/125 million) had at least one diagnosed risk factor for severe RSV disease (including congestive heart failure, coronary heart disease, stroke, angina, myocardial infarction, chronic obstructive pulmonary disease , current asthma, diabetes, current liver disease, and/or renal disease)
 
References:
 
1.     E.Horn et al, "Characteristics Associated with the Presence of One or More Risk Factors for Severe Respiratory Syncytial Virus Disease among Adults in the United States", poster presented at ID Week 2024 [available on demand: P691 - DV-009542.pdf]
2.     National Institute of Allergy and Infectious Diseases, Respiratory Syncytial Virus (RSV). Available at: https://www.niaid.nih.gov/diseases-conditions/respiratory-syncytial-virus-rsv Accessed June 2025
3.     McLaughlin JM, Khan F, Begier E, et al. Rates of Medically Attended RSV Among US Adults: A Systematic Review and Meta-analysis. Open Forum Infect Dis.
4.     Atamna A, Babich T, et al. Morbidity and mortality of respiratory syncytial virus infection in hospitalized adults: Comparison with seasonal influenza. Int J Infect Dis. 2021 Feb;103:489-493. doi: 10.1016/j.ijid.2020.11.185.
5.     Falsey, AR et al. Respiratory syncytial virus infection in elderly and high-risk adults, in New Engl J Med 2005; 352:1749-59. doi: 10.1056/NEJMoa043951
6.     Clinicaltrials.gov, "A Study on the Immune Response and Safety of Vaccine Against Respiratory Syncytial Virus (RSV) Given to Adults 18 to 49 Years of Age at Increased Risk for Respiratory Syncytial Virus Disease, Compared to Older Adults 60 Years of Age and Above" - available at: https://clinicaltrials.gov/study/NCT06389487
 
 
 
 
SIGNATURES
 
 
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorised.
 
GSK plc
 
(Registrant)
 
 
Date: July 14, 2025
 
 
 
 
By:/s/ VICTORIA WHYTE
--------------------------
 
 
 
Victoria Whyte
 
Authorised Signatory for and on
 
behalf of GSK plc

FAQ

What did GSK (GSK) announce in its July 2025 Form 6-K?

The company reported that the FDA accepted its application to expand Arexvy’s indication to high-risk adults aged 18-49.

How large is the potential US market for Arexvy in adults 18-49?

GSK cites roughly 21 million US adults under 50 with at least one risk factor for severe RSV infection.

What trial data support the expanded indication?

Phase IIIb study NCT06389487 (n = 1,458) met non-inferiority for RSV-A and RSV-B neutralising antibodies and showed safety consistent with prior trials.

When is the FDA decision expected?

GSK anticipates an FDA ruling in H1 2026.

Is Arexvy already approved for other age groups?

Yes, it is authorised in the US for adults ≥60 and for high-risk adults 50-59, and in >60 countries for older adults.

Is GSK seeking approvals outside the United States?

The company is pursuing similar label expansions in the European Economic Area and Japan.
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