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[6-K] ASTRAZENECA PLC Current Report (Foreign Issuer)

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AstraZeneca announced positive topline results from the Bax24 Phase III trial showing baxdrostat 2mg once daily met the primary endpoint in patients with treatment-resistant hypertension (rHTN). In a randomized, double-blind study of 218 patients over a 12-week double-blind period, baxdrostat produced a statistically significant and clinically meaningful reduction in ambulatory 24-hour average systolic blood pressure versus placebo, with efficacy sustained across the full 24-hour period including the higher-risk morning window. The company reported baxdrostat was generally well tolerated with a safety profile consistent with prior BaxHTN data. AstraZeneca said it will share data with regulators globally and present results at the American Heart Association sessions in November 2025. Baxdrostat, acquired via the CinCor transaction, is being developed for hypertension, primary aldosteronism, chronic kidney disease and heart-failure prevention, supported by its reported half-life of about 26–30 hours and selective aldosterone synthase inhibition.

AstraZeneca ha annunciato risultati positivi di linea principale dello studio Bax24 di fase III che mostrano che baxdrostat 2 mg una volta al giorno ha raggiunto l'obiettivo primario in pazienti con ipertensione resistente al trattamento (rHTN). In uno studio randomizzato in doppio cieco che coinvolge 218 pazienti per un periodo di 12 settimane, baxdrostat ha prodotto una riduzione statisticamente significativa e clinicamente rilevante della pressione arteriosa sistolica media su 24 ore ambulante rispetto al placebo, con efficacia sostenuta per l'intero periodo di 24 ore includendo la finestra mattutina ad alto rischio. L'azienda ha riferito che baxdrostat è stato generalmente ben tollerato con un profilo di sicurezza coerente con i dati BaxHTN precedenti. AstraZeneca ha dichiarato che condividerà i dati con i regolatori a livello globale e presenterà i risultati nelle sessioni dell'American Heart Association in novembre 2025. Baxdrostat, acquisito tramite la transazione CinCor, è in sviluppo per ipertensione, aldosteronismo primario, malattia renale cronica e prevenzione dell'insufficienza cardiaca, supportato dalla sua emivita riportata di circa 26–30 ore e dall'inibizione selettiva della sintesi dell'aldosterone.

AstraZeneca anunció resultados positivos de línea principal del ensayo Bax24 de fase III que muestran que baxdrostat 2 mg una vez al día cumplió el objetivo primario en pacientes con hipertensión resistente al tratamiento (rHTN). En un estudio aleatorizado y doble ciego que involucró 218 pacientes durante un periodo de 12 semanas, baxdrostat produjo una reducción estadísticamente significativa y clínica relevante de la presión arterial sistólica media de 24 horas ambulatoria frente a placebo, con la eficacia sostenida a lo largo de las 24 horas, incluida la ventana matutina de mayor riesgo. La compañía informó que baxdrostat fue generalmente bien tolerado, con un perfil de seguridad consistente con los datos previos de BaxHTN. AstraZeneca dijo que compartirá los datos con reguladores a nivel mundial y presentará los resultados en las sesiones de la American Heart Association en noviembre 2025. Baxdrostat, adquirido a través de la transacción CinCor, se está desarrollando para hipertensión, aldosteronismo primario, enfermedad renal crónica y prevención de la insuficiencia cardíaca, respaldado por su vida media reportada de alrededor de 26–30 horas y la inhibición selectiva de la enzima sintetizadora de aldosterona (synthase).

AstraZeneca는 Bax24 3상에서 baxdrostat 2 mg 매일 1회 투여가 치료 저항성 고혈압(rHTN) 환자에서 1차 평가 변수을 충족했다는 긍정적 topline 결과를 발표했습니다. 무작위 이중 맹검 연구에서 218명의 환자를 대상으로 12주의 이중 맹검 기간 동안 baxdrostat은 위약 대비 24시간 평균 수축기 혈압 ambulatory의 통계적으로 유의하고 임상적으로 의미 있는 감소를 보였으며, 효과는 24시간 전체 기간에 걸쳐 지속되었고 위험이 높은 모닝 윈도우도 포함되었습니다. 회사는 BaxHTN 데이터와 일치하는 안전성 프로파일로 baxdrostat이 일반적으로 잘 견뎌졌다고 밝혔습니다. AstraZeneca는 전 세계 규제 당국과 데이터를 공유하고 2025년 11월 American Heart Association 세션에서 결과를 발표할 것이라고 말했습니다. CinCor 거래를 통해 인수된 Baxdrostat은 고혈압, 원발성 알도스테론증, 만성 신장질환 및 심부전 예방을 위한 개발 중이며, 약 26–30시간의 반감기와 선택적 알도스테론 합성효소 억제를 지지한다고 합니다.

AstraZeneca a annoncé des résultats positifs de pointe de Bax24 essai de phase III montrant que baxdrostat 2 mg une fois par jour a atteint l'objectif primaire chez des patients atteints d'hypertension résistante au traitement (rHTN). Dans une étude randomisée en double aveugle impliquant 218 patients sur une période de 12 semaines, baxdrostat a produit une réduction statistiquement significative et cliniquement pertinente de la pression artérielle systolique moyenne sur 24 heures en ambulatoire par rapport au placebo, avec une efficacité maintenue sur l'ensemble des 24 heures, y compris la tranche matinale à haut risque. La société a déclaré que baxdrostat était généralement bien toléré avec un profil de sécurité cohérent avec les données BaxHTN précédentes. AstraZeneca a indiqué qu'elle partagera les données avec les régulateurs du monde entier et présentera les résultats lors des sessions de l'American Heart Association en novembre 2025. Baxdrostat, acquis via la transaction CinCor, est en développement pour l'hypertension, l'aldostéronisme primaire, la maladie rénale chronique et la prévention de l'insuffisance cardiaque, soutenu par sa demi-vie affichée d'environ 26–30 heures et l'inhibition sélective de la synthase de l'aldostérone.

AstraZeneca kündigte positive Topline-Ergebnisse der Bax24-Phase-III-Studie an, die zeigen, dass baxdrostat 2 mg einmal täglich das primäre Endziel bei Patienten mit therapieresistenter Hypertension (rHTN) erreicht hat. In einer randomisierten, doppelblinden Studie mit 218 Patienten über eine 12-wöchige Doppelblindphase erzielte baxdrostat eine statistisch signifikante und klinisch bedeutsame Reduktion des ambulanten 24-Stunden-Durchschnitts-Blutdrucks gegenüber Placebo, wobei die Wirksamkeit über den gesamten 24-Stunden-Zeitraum hinweg erhalten blieb, auch in dem risikoreichen Morgenfenster. Das Unternehmen berichtete, baxdrostat sei im Allgemeinen gut verträglich mit einem Sicherheitsprofil, das mit den früheren BaxHTN-Daten übereinstimmt. AstraZeneca sagte, dass sie Daten weltweit mit Regulierungsbehörden teilen und Ergebnisse bei den Sessions der American Heart Association im November 2025 präsentieren werde. Baxdrostat, im Zuge der Cin-Cor-Transaktion erworben, wird für Hypertension, primären Aldosteronismus, chronische Nierenerkrankung und Prävention von Herzinsuffizienz entwickelt, unterstützt durch seine berichtete Halbwertszeit von ca. 26–30 Stunden und die selektive Hemmung der Aldosteron-Synthase.

أسترازينيكا أعلنت عن نتائج إيجابية من خط الأساس لتجربة Bax24 في المرحلة الثالثة، تظهر أن baxdrostat 2 mg مرة يوميًا حقق الهدف الأساسي لدى مرضى ارتفاع ضغط الدم المقاوم للعلاج (rHTN). في دراسة عشوائية مزدوجة التعمية شملت 218 مريضًا لمدة 12 أسبوعًا من التعميه المزدوجة، أظهر baxdrostat انخفاضًا ذا دلالة إحصائية وذو معنى سريري في ضغط الدم الانبساطي المتوسط لمدة 24 ساعة مقارنة بالدواء الوهمي، مع استمرار الفعالية عبر كامل الـ 24 ساعة بما في ذلك نافذة الصباح عالية المخاطر. أشارت الشركة إلى أن baxdrostat كان عمومًا مُتحمَّلاً جيدًا مع ملف أمان متسق مع بيانات BaxHTN السابقة. قالت أسترازينيكا إنها ستشارك البيانات مع الجهات التنظيمية عالميًا وستعرض النتائج في جلسات الجمعية الأمريكية للقلب في نوفمبر 2025. Baxdrostat، الذي اشترته من خلال صفقة CinCor، قيد التطوير لعلاج ارتفاع ضغط الدم، فرط ألدستيرون الدم الأساسي، مرض الكلى المزمن والوقاية من فشل القلب، مدعوم بمدة نصف حياة تبلغ حوالي 26–30 ساعة ومع تثبيط انتقائي لإنزيم تصنيع الألدوسترون.

阿斯利康宣布 Bax24 第三阶段试验的 topline 积极结果,显示 baxdrostat 2 mg 每日一次 在治疗困难性高血压(rHTN)患者中达到了主要终点。在一项随机、双盲的研究中,共有 218 名患者,试验期为 12 周 的双盲阶段,baxdrostat 相对于安慰剂在随访< b>24 小时平均收缩压 上产生统计学显著且临床上具有意义的降低,且这种效应在整个24小时内持续,包括高风险的早晨窗口。公司表示 baxdrostat 的耐受性总体良好,安全性特征与此前 BaxHTN 数据一致。阿斯利康表示将与全球监管机构分享数据,并在 2025年11月 的美国心脏协会会议上公布结果。通过 CinCor 交易获得的 Baxdrostat 正在开发用于高血压、原发性醛固酮增多症、慢性肾病和心力衰竭预防,其半衰期约为 26–30 小时,并具选择性醛固酮合成酶抑制作用。

Positive
  • Baxdrostat 2mg QD met primary endpoint with a statistically significant reduction in ambulatory 24-hour average SBP
  • Efficacy sustained across 24 hours, including the morning period associated with higher cardiovascular risk
  • Generally well tolerated with safety consistent with prior BaxHTN trial
  • Data to be shared with regulators and presented at the AHA in November 2025, supporting regulatory engagement
Negative
  • Topline only — full dataset pending: magnitude of SBP reduction, secondary endpoints, and subgroup analyses not disclosed
  • Short-term data: reported results cover a 12-week double-blind period, so long-term efficacy and safety remain unreported
  • Patient count is modest at 218 randomized patients for a Phase III program, requiring confirmatory evidence for broad labeling

Insights

Positive Phase III proof-of-concept increases regulatory and commercial prospects.

Bax24 showing a statistically significant reduction in ambulatory 24-hour systolic blood pressure for baxdrostat 2mg QD supports a clear therapeutic signal in resistant hypertension, a population with high unmet need. The sustained 24-hour control, including the morning surge, is clinically relevant because ambulatory measures better predict cardiovascular events.

The data strengthen regulatory filing discussions and the case for label claims tied to 24-hour control; monitor the full dataset at the November 2025 AHA presentation for magnitude of effect, secondary endpoint results, subgroup consistency and safety details over the 12-week period.

Topline success improves regulatory filing timing and commercial positioning in CVRM.

The company plans to share results with regulators worldwide and advance filings; a positive Phase III in rHTN can support submissions if secondary endpoints and safety align. The reported half-life of 26–30 hours may support once-daily dosing claims that are commercially attractive.

Key dependencies are the detailed safety profile, durability beyond 12 weeks, and whether secondary endpoints (night-time SBP, responder rates) reach clinically meaningful thresholds; outcomes at the AHA session and regulator feedback will drive timelines.

AstraZeneca ha annunciato risultati positivi di linea principale dello studio Bax24 di fase III che mostrano che baxdrostat 2 mg una volta al giorno ha raggiunto l'obiettivo primario in pazienti con ipertensione resistente al trattamento (rHTN). In uno studio randomizzato in doppio cieco che coinvolge 218 pazienti per un periodo di 12 settimane, baxdrostat ha prodotto una riduzione statisticamente significativa e clinicamente rilevante della pressione arteriosa sistolica media su 24 ore ambulante rispetto al placebo, con efficacia sostenuta per l'intero periodo di 24 ore includendo la finestra mattutina ad alto rischio. L'azienda ha riferito che baxdrostat è stato generalmente ben tollerato con un profilo di sicurezza coerente con i dati BaxHTN precedenti. AstraZeneca ha dichiarato che condividerà i dati con i regolatori a livello globale e presenterà i risultati nelle sessioni dell'American Heart Association in novembre 2025. Baxdrostat, acquisito tramite la transazione CinCor, è in sviluppo per ipertensione, aldosteronismo primario, malattia renale cronica e prevenzione dell'insufficienza cardiaca, supportato dalla sua emivita riportata di circa 26–30 ore e dall'inibizione selettiva della sintesi dell'aldosterone.

AstraZeneca anunció resultados positivos de línea principal del ensayo Bax24 de fase III que muestran que baxdrostat 2 mg una vez al día cumplió el objetivo primario en pacientes con hipertensión resistente al tratamiento (rHTN). En un estudio aleatorizado y doble ciego que involucró 218 pacientes durante un periodo de 12 semanas, baxdrostat produjo una reducción estadísticamente significativa y clínica relevante de la presión arterial sistólica media de 24 horas ambulatoria frente a placebo, con la eficacia sostenida a lo largo de las 24 horas, incluida la ventana matutina de mayor riesgo. La compañía informó que baxdrostat fue generalmente bien tolerado, con un perfil de seguridad consistente con los datos previos de BaxHTN. AstraZeneca dijo que compartirá los datos con reguladores a nivel mundial y presentará los resultados en las sesiones de la American Heart Association en noviembre 2025. Baxdrostat, adquirido a través de la transacción CinCor, se está desarrollando para hipertensión, aldosteronismo primario, enfermedad renal crónica y prevención de la insuficiencia cardíaca, respaldado por su vida media reportada de alrededor de 26–30 horas y la inhibición selectiva de la enzima sintetizadora de aldosterona (synthase).

AstraZeneca는 Bax24 3상에서 baxdrostat 2 mg 매일 1회 투여가 치료 저항성 고혈압(rHTN) 환자에서 1차 평가 변수을 충족했다는 긍정적 topline 결과를 발표했습니다. 무작위 이중 맹검 연구에서 218명의 환자를 대상으로 12주의 이중 맹검 기간 동안 baxdrostat은 위약 대비 24시간 평균 수축기 혈압 ambulatory의 통계적으로 유의하고 임상적으로 의미 있는 감소를 보였으며, 효과는 24시간 전체 기간에 걸쳐 지속되었고 위험이 높은 모닝 윈도우도 포함되었습니다. 회사는 BaxHTN 데이터와 일치하는 안전성 프로파일로 baxdrostat이 일반적으로 잘 견뎌졌다고 밝혔습니다. AstraZeneca는 전 세계 규제 당국과 데이터를 공유하고 2025년 11월 American Heart Association 세션에서 결과를 발표할 것이라고 말했습니다. CinCor 거래를 통해 인수된 Baxdrostat은 고혈압, 원발성 알도스테론증, 만성 신장질환 및 심부전 예방을 위한 개발 중이며, 약 26–30시간의 반감기와 선택적 알도스테론 합성효소 억제를 지지한다고 합니다.

AstraZeneca a annoncé des résultats positifs de pointe de Bax24 essai de phase III montrant que baxdrostat 2 mg une fois par jour a atteint l'objectif primaire chez des patients atteints d'hypertension résistante au traitement (rHTN). Dans une étude randomisée en double aveugle impliquant 218 patients sur une période de 12 semaines, baxdrostat a produit une réduction statistiquement significative et cliniquement pertinente de la pression artérielle systolique moyenne sur 24 heures en ambulatoire par rapport au placebo, avec une efficacité maintenue sur l'ensemble des 24 heures, y compris la tranche matinale à haut risque. La société a déclaré que baxdrostat était généralement bien toléré avec un profil de sécurité cohérent avec les données BaxHTN précédentes. AstraZeneca a indiqué qu'elle partagera les données avec les régulateurs du monde entier et présentera les résultats lors des sessions de l'American Heart Association en novembre 2025. Baxdrostat, acquis via la transaction CinCor, est en développement pour l'hypertension, l'aldostéronisme primaire, la maladie rénale chronique et la prévention de l'insuffisance cardiaque, soutenu par sa demi-vie affichée d'environ 26–30 heures et l'inhibition sélective de la synthase de l'aldostérone.

AstraZeneca kündigte positive Topline-Ergebnisse der Bax24-Phase-III-Studie an, die zeigen, dass baxdrostat 2 mg einmal täglich das primäre Endziel bei Patienten mit therapieresistenter Hypertension (rHTN) erreicht hat. In einer randomisierten, doppelblinden Studie mit 218 Patienten über eine 12-wöchige Doppelblindphase erzielte baxdrostat eine statistisch signifikante und klinisch bedeutsame Reduktion des ambulanten 24-Stunden-Durchschnitts-Blutdrucks gegenüber Placebo, wobei die Wirksamkeit über den gesamten 24-Stunden-Zeitraum hinweg erhalten blieb, auch in dem risikoreichen Morgenfenster. Das Unternehmen berichtete, baxdrostat sei im Allgemeinen gut verträglich mit einem Sicherheitsprofil, das mit den früheren BaxHTN-Daten übereinstimmt. AstraZeneca sagte, dass sie Daten weltweit mit Regulierungsbehörden teilen und Ergebnisse bei den Sessions der American Heart Association im November 2025 präsentieren werde. Baxdrostat, im Zuge der Cin-Cor-Transaktion erworben, wird für Hypertension, primären Aldosteronismus, chronische Nierenerkrankung und Prävention von Herzinsuffizienz entwickelt, unterstützt durch seine berichtete Halbwertszeit von ca. 26–30 Stunden und die selektive Hemmung der Aldosteron-Synthase.

 
FORM 6-K
 
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
 
 
Report of Foreign Issuer
 
Pursuant to Rule 13a-16 or 15d-16 of
the Securities Exchange Act of 1934
 
For the month of October 2025
 
Commission File Number: 001-11960
 
AstraZeneca PLC
 
1 Francis Crick Avenue
Cambridge Biomedical Campus
Cambridge CB2 0AA
United Kingdom
 
 
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 __
 
Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):
 
Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ______
 
Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.
 
Yes __ No X
 
If “Yes” is marked, indicate below the file number assigned to the Registrant in connection with Rule 12g3-2(b): 82-_____________
 
 
 
AstraZeneca PLC
 
INDEX TO EXHIBITS
 
 
1.
Baxdrostat met primary endpoint in Bax24 Ph3 trial
 
 
 7 October 2025
 
Baxdrostat met the primary endpoint in Bax24 Phase III trial in patients with resistant hypertension
 
Baxdrostat demonstrated a statistically significant and highly clinically meaningful reduction in 24-hour ambulatory systolic blood pressure compared with placebo
 
Positive high-level results from the Bax24 Phase III trial showed baxdrostat demonstrated a statistically significant and highly clinically meaningful reduction in ambulatory 24-hour average systolic blood pressure (SBP) compared with placebo at 12 weeks. Efficacy was observed throughout the 24-hour period, including early morning, when patients with hypertension are at a higher risk of cardiovascular events.1-3
 
Patients with treatment-resistant hypertension (rHTN) received baxdrostat 2mg or placebo on top of standard of care. Baxdrostat was generally well tolerated, with a safety profile consistent with the BaxHTN trial.4
 
There are 1.4 billion people worldwide living with hypertension.5 In the US, approximately 50% of patients living with hypertension on multiple treatments do not have their blood pressure under control.6 Consistent 24-hour blood pressure control is an important clinical outcome in patients with hard-to-control hypertension.7-9 Multiple studies have demonstrated that 24-hour blood pressure is a more powerful predictor of cardiovascular events than a clinic-based measurement.3,10 When 24-hour average systolic blood pressure rises by 9.5 mmHg, the risk of all-cause mortality increases by 30%.3
 
Dr. Bryan Williams, Chair of Medicine at University College London, primary investigator, said: "The Bax24 results show that a once-daily baxdrostat regimen can deliver highly clinically meaningful reductions in 24-hour systolic blood pressure, including in the morning when patients are at greater risk of heart attack and stroke. These results are groundbreaking and together with the BaxHTN results mean we have the potential to change our treatment approach for the many patients whose hypertension remains uncontrolled despite current therapies."
 
Sharon Barr, Executive Vice President, BioPharmaceuticals R&D, said: "This second Phase III trial of baxdrostat shows substantial improvement in blood pressure, which reflects its durable half-life of up to 30 hours and highly selective inhibition of aldosterone synthase. Too many patients today have hypertension that remains hard-to-control throughout the day and night, making them especially vulnerable to cardiac events. We are advancing our regulatory filings and rapidly progressing our robust clinical development programme for baxdrostat, as both a mono- and combination-therapy, across additional conditions where aldosterone plays a key role, including primary aldosteronism, chronic kidney disease and heart failure prevention."
 
The data will be shared with regulatory authorities around the world and presented in a late-breaking session at the American Heart Association (AHA) Scientific Sessions in November 2025.
 
Baxdrostat is designed to lower blood pressure by specifically inhibiting aldosterone, a key hormone that raises blood pressure and increases the risk of heart and kidney problems. Phase I studies show baxdrostat reached peak levels in the blood within 2 to 4 hours and had a half-life of about 26 to 30 hours.11,12 Baxdrostat is currently being investigated as a monotherapy for hypertension13-15 and primary aldosteronism,16 and in combination with dapagliflozin for chronic kidney disease17,18 and the prevention of heart failure in high-risk patients.19
 
Notes
 
Hard-to-control hypertension
Hypertension is a medical condition characterised by consistently high blood pressure levels, affecting an estimated 1.4 billion people worldwide.4,20,21 Over time, this can damage blood vessels and vital organs, increasing the risk of serious health problems such as heart attack, stroke, heart failure and kidney disease.20,21 An observational study of nearly 60,000 patients studied over a median of 9.7 years showed that a 9.5 mmHg increase in SBP was associated with a 30% increase in risk of all-cause mortality and 41% increase in risk of cardiovascular death.10Studies have shown that increased night-time blood pressure is associated with higher cardiovascular risk,7,10 and patients with hypertension have a higher risk of cardiovascular events like heart attack, stroke and death around the time of their morning blood pressure surge.1,2
 
Hard-to-control (uncontrolled and resistant) hypertension remains a major public health challenge.22 Despite lifestyle changes and the use of multiple medications, approximately 50% of patients in the US who are being treated for hypertension still do not have their blood pressure under control.5 Uncontrolled hypertension refers to persistently elevated blood pressure despite the use of two or more medications, while rHTN, a more severe form, remains elevated despite treatment with three or more medications.5,20
 
A key contributor to hard-to-control hypertension is aldosterone, a hormone that raises blood pressure by promoting sodium and water retention.23,24 Elevated aldosterone levels, along with factors such as obesity, high salt intake, and various genetic or secondary conditions,25 are strongly associated with poor blood pressure control. When left untreated, hypertension significantly increases the risk of cardiovascular and kidney-related complications.20,21
 
Bax24 trial
The Phase III Bax24 trial15 is a randomised, double-blind, placebo-controlled, parallel group study to evaluate the safety, tolerability and the effect of 2mg baxdrostat versus placebo, administered once a day (QD) orally, on the reduction of ambulatory SBP in participants with rHTN. A total of 218 patients were randomised in a 1:1 ratio to receive baxdrostat 2mg or placebo once daily during a 12-week double blind period. The primary efficacy endpoint was the change from baseline in ambulatory 24-hour average SBP at Week 12.
 
Additional secondary endpoints include the effect of baxdrostat versus placebo on change from baseline in ambulatory night-time average SBP at Week 12, change from baseline in ambulatory daytime average SBP at Week 12, change from baseline in seated SBP at Week 12, the number of participants achieving ambulatory 24-hour average SBP of less than 130 mmHg at Week 12 and the number of participants achieving a nocturnal SBP dipping of greater than 10% at Week 12. Occurrence of adverse events was evaluated during the 12-week treatment period as well as during a 2-week safety follow-up period.
 
Baxdrostat
Baxdrostat is a potential first-in-class, highly selective and potent, oral, small molecule that inhibits aldosterone synthase,11 an enzyme encoded by the CYP11B2 gene, which is responsible for the synthesis of aldosterone in the adrenal gland.23 In clinical trials, baxdrostat was observed to significantly lower aldosterone levels without affecting cortisol levels across a wide range of doses.12,26 Baxdrostat is currently being investigated in clinical trials as a monotherapy for hypertension13-15 and primary aldosteronism,16 and in combination with dapagliflozin for chronic kidney disease and hypertension,17,18 and the prevention of heart failure in patients with hypertension.19
 
AstraZeneca acquired baxdrostat through its purchase of CinCor Pharma, Inc. in February 2023.27
 
AstraZeneca in CVRM
Cardiovascular, Renal and Metabolism (CVRM), part of BioPharmaceuticals, forms one of AstraZeneca's main disease areas and is a key growth driver for the Company. By following the science to understand more clearly the underlying links between the heart, kidneys, liver and pancreas, AstraZeneca is investing in a portfolio of medicines for organ protection by slowing or stopping disease progression, and ultimately paving the way towards regenerative therapies. The Company's ambition is to improve and save the lives of millions of people, by better understanding the interconnections between CVRM diseases and targeting the mechanisms that drive them, so we can detect, diagnose and treat people earlier and more effectively.
 
AstraZeneca
AstraZeneca (LSE/STO/Nasdaq: AZN) is a global, science-led biopharmaceutical company that focuses on the discovery, development, and commercialisation of prescription medicines in Oncology, Rare Diseases, and BioPharmaceuticals, including Cardiovascular, Renal & Metabolism, and Respiratory & Immunology. Based in Cambridge, UK, AstraZeneca's innovative medicines are sold in more than 125 countries and used by millions of patients worldwide. Please visit astrazeneca.com and follow the Company on Social Media @AstraZeneca.
 
Contacts
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References
1.   Renna NF, et al. Morning blood pressure surge as a predictor of cardiovascular events in patients with hypertension. Blood Press Monit. 2023;28(3):149-157
2.   Kario K et al. Morning hypertension: the strongest independent risk factor for stroke in elderly hypertensive patients. Hypertens Res. 2006;29(8):581-7.
3.   Staplin N, et al. Relationship between clinic and ambulatory blood pressure and mortality: an observational cohort study in 59 124 patients. Lancet. 2023;401(10393):2041-2050. 
4.   Flack JM, et al. Efficacy and Safety of Baxdrostat in Uncontrolled and Resistant Hypertension. N Engl J Med. 2025. Aug 30:10.1056/NEJMoa2507109. doi: 10.1056/NEJMoa2507109.
5.   World Health Organization. Global report on hypertension 2025: high stakes: turning evidence into action. 2025.  https://iris.who.int/handle/10665/382841. Accessed September 2025.
6.   Carey RM, et al. Prevalence of Apparent Treatment-Resistant Hypertension in the United States. Hypertension. 2019;73(2):424-431. Accessed September 2025.
7.   Narita K, et al. Nighttime Home Blood Pressure Is Associated With the Cardiovascular Disease Events Risk in Treatment-Resistant Hypertension. Hypertension. 2022;79(2):e18-e20
8.   Kario K, et al. Nighttime Blood Pressure Phenotype and Cardiovascular Prognosis. Circulation. 2020;142(19):1810-1820
9.   Williams B, et al. 2018 ESC/ESH Guidelines for the management of arterial hypertension: The Task Force for the management of arterial hypertension of the European Society of Cardiology (ESC) and the European Society of Hypertension (ESH). European Heart Journal. 2018;39(33):3021-3104.
10.  Niiranen TJ, Mäki J, Puukka P, Karanko H, Jula AM. Office, home, and ambulatory blood pressures as predictors of cardiovascular risk. Hypertension. 2014 Aug;64(2):281-6. doi: 10.1161/HYPERTENSIONAHA.114.03292. PMID: 24842916. Accessed September 2025.
11.  Bogman K, et al. Preclinical and early clinical profile of a highly selective and potent oral inhibitor of aldosterone synthase (CYP11B2). Hypertension. 2017;69(1):189-196. Accessed September 2025.
12.  Freeman MW, et al. Results from a phase 1, randomized, double-blind, multiple ascending dose study characterizing the pharmacokinetics and demonstrating the safety and selectivity of the aldosterone synthase inhibitor baxdrostat in healthy volunteers. Hypertens Res. 2023;46(1):108-118. Accessed September 2025.
13.  ClinicalTrials.gov.A Study to Investigate the Efficacy and Safety of Baxdrostat in Participants With Uncontrolled Hypertension on Two or More Medications Including Participants With Resistant Hypertension (BaxHTN). Available at: https://clinicaltrials.gov/study/NCT06034743. Accessed September 2025.
14.  ClinicalTrials.gov. A Study to Investigate the Efficacy and Safety of Baxdrostat in Participants With Uncontrolled Hypertension on Two or More Medications Including Participants With Resistant Hypertension (BaxAsia). Available at: https://clinicaltrials.gov/study/NCT06344104. Accessed September 2025.
15.  ClinicalTrials.gov. A Study to Investigate the Effect of Baxdrostat on Ambulatory Blood Pressure in Participants With Resistant Hypertension (Bax24). Available at:  https://clinicaltrials.gov/study/NCT06168409. Accessed September 2025.
16.  ClinicalTrials.gov. A Study to Assess Efficacy and Safety of Baxdrostat in Participants With Primary Aldosteronism (BaxPA). Available at: https://clinicaltrials.gov/study/NCT07007793. Accessed September 2025.
17.  ClinicalTrials.gov. A Phase III Study to Investigate the Efficacy and Safety of Baxdrostat in Combination With Dapagliflozin on CKD Progression in Participants With CKD and High Blood Pressure. Available at: https://clinicaltrials.gov/study/NCT06268873. Accessed September 2025.
18.  ClinicalTrials.gov. A Phase III Renal Outcomes and Cardiovascular Mortality Study to Investigate the Efficacy and Safety of Baxdrostat in Combination With Dapagliflozin in Participants With Chronic Kidney Disease and High Blood Pressure (BaxDuo-Pacific). Available at: https://clinicaltrials.gov/study/NCT06677060. Accessed September 2025.
19.  ClinicalTrials.gov. Phase III Study Investigating Heart Failure and Cardiovascular Death With Baxdrostat in Combination With Dapagliflozin (Prevent-HF). Available at:  https://clinicaltrials.gov/study/NCT06677060. Accessed September 2025.
20.  McEvoy JW, et al. 2024 ESC Guidelines for the management of elevated blood pressure and hypertension. Eur Heart J. 2024;45(38):3912-4018. Accessed September 2025.
21.  Whelton PK, et al. 2017 ACC/AHA/AAPA/ABC/ACPM/AGS/APhA/ASH/ASPC/NMA/PCNA Guideline for the prevention, detection, evaluation, and management of high blood pressure in adults: Executive summary: A report of the American College of Cardiology/American Heart Association task force on clinical practice guidelines. Hypertension. 2018;71(6):1269-1324. Accessed September 2025.
22.  NCD Risk Factor Collaboration (NCD-RisC). Worldwide trends in hypertension prevalence and progress in treatment and control from 1990 to 2019: a pooled analysis of 1201 population-representative studies with 104 million participants. Lancet. 2021 Sep 11;398(10304):957-980. doi: 10.1016/S0140-6736(21)01330-1. 
23.  Cannavo A, et al. Aldosterone and mineralocorticoid receptor system in cardiovascular physiology and pathophysiology. Oxid Med Cell Longev. 2018;2018:1204598. Accessed September 2025.
24.  Inoue K, et al. Serum aldosterone concentration, blood pressure, and coronary artery calcium: The multi-ethnic study of atherosclerosis. Hypertension. 2020;76(1):113-120. Accessed September 2025.
25.  van Oort S, et al. Association of cardiovascular risk factors and lifestyle behaviors with hypertension: a mendelian randomization study. Hypertension. 2020;76(6):1971-1979.
26.  Freeman MW, et al. Phase 2 trial of baxdrostat for treatment-resistant hypertension. N Engl J Med. 2023;388(5):395-405. Accessed September 2025.
27.  AstraZeneca 2023. Acquisition of CinCor Pharma complete. https://www.astrazeneca.com/media-centre/press-releases/2023/astrazeneca-acquires-cincor-for-cardiorenal-asset.html. Accessed September 2025.
 
 
Matthew Bowden
Company Secretary
AstraZeneca PLC
 
 
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 authorized.
 
 
AstraZeneca PLC
 
 
Date: 07 October 2025
 
 
By: /s/ Matthew Bowden
 
Name: Matthew Bowden
 
Title: Company Secretary

FAQ

What did AstraZeneca announce about baxdrostat in the Bax24 trial (AZN)?

AstraZeneca reported that baxdrostat 2mg once daily met the primary endpoint in the Bax24 Phase III trial, showing a statistically significant reduction in ambulatory 24-hour average systolic blood pressure versus placebo at Week 12.

How many patients were enrolled in the Bax24 trial?

The Bax24 trial randomized 218 patients in a 1:1 ratio to receive baxdrostat 2mg or placebo during a 12-week double-blind period.

Was baxdrostat well tolerated in Bax24?

Yes. AstraZeneca stated baxdrostat was generally well tolerated with a safety profile consistent with the earlier BaxHTN trial, but full safety details were not included in the topline release.

When and where will detailed Bax24 results be presented?

AstraZeneca will present the data in a late-breaking session at the American Heart Association Scientific Sessions in November 2025 and will share results with regulatory authorities globally.

What is baxdrostat and how does it work?

Baxdrostat is an oral, selective inhibitor of aldosterone synthase (CYP11B2) designed to lower blood pressure by reducing aldosterone production; Phase I data show peak levels at 2–4 hours and a half-life of about 26–30 hours.
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