Investigational PET tracer iodine 124 evuzamitide from Bayer met primary endpoints in Phase III study in patients suspected to have cardiac amyloidosis 

Bayer today announced positive topline results from the Phase III REVEAL study, an investigator-initiated study by Brigham and Women’s Hospital that evaluated the investigational PET/CT radiotracer I 124 evuzamitide.⁵ The study met the primary endpoints of sensitivity (the ability of a test to identify individuals who have the condition) and specificity (the ability of a test to identify individuals who do not have the condition) for the diagnosis of cardiac amyloidosis based on visual scan interpretation.⁵ Bayer plans to present the complete results at an upcoming scientific congress.  

I 124 evuzamitide is an investigational, positron emission tomography (PET) radiotracer – a radioactive diagnostic imaging agent injected into the body before a PET scan to assist with visualization – being studied in patients with suspected cardiac amyloidosis.⁵

The compound was previously granted Breakthrough Therapy Designation for PET imaging in patients with suspected or known cardiac amyloidosis as well as Orphan Drug status for both light-chain amyloidosis (AL) and transthyretin amyloidosis (ATTR) in the U.S. and the EU. Bayer plans to discuss the data and submission for regulatory approval with the FDA and other health authorities. I 124 evuzamitide is an investigational compound and has not been approved by any health authorities for use in any country for any indication.  

“Cardiac amyloidosis is often under or misdiagnosed, impacting patients’ ability to begin appropriate treatment earlier, when it may help prevent further organ damage,” said REVEAL principal investigator Dr. Sharmila Dorbala, Director of Nuclear Cardiology at Brigham and Women’s Hospital. “These 124 evuzamitide data demonstrate the potential of a single test to help health care providers identify or exclude cardiac amyloidosis. Clinically, a sensitive, specific and quantitative PET tracer could help distinguish cardiac amyloidosis from other causes of heart failure, differentiate amyloid subtypes when used alongside appropriate laboratory testing, and track changes in cardiac amyloid burden over time.”

I 124 evuzamitide is one of two investigational amyloid radiotracers that Bayer acquired from Attralus, Inc. The compound is also known as AT-01. The acquisition, announced in early 2026, expanded Bayer’s radiology pipeline with complementary tracers targeting systemic amyloid disease and reinforced the company’s strategy to build a leading position in imaging precision for cardiovascular and other serious conditions.

“With a strong presence in radiology, we are committed to bringing forward options for earlier diagnosis of diseases such as cardiac amyloidosis for the benefit of patients,” said Dr. Konstanze Diefenbach, Head of Radiology Research & Development at Bayer’s Pharmaceutical Division. “We are very excited about the positive topline results of the REVEAL study and are looking forward to sharing the data with the scientific community.”

ENDS 

ABOUT CARDIAC AMYLOIDOSIS

Cardiac amyloidosis is a severe, progressive disease caused by the accumulation of misfolded proteins (amyloid) in heart tissue, making it stiff and thick which can impair its ability to pump blood effectively. As the disease is underdiagnosed, current estimates state the condition impacts around 400,000 patients worldwide6, though the number is likely greater. Without appropriate diagnosis and treatment, cardiac amyloidosis can lead to heart failure, frequent hospitalisations and early mortality.⁷

Currently, there is no single, non-invasive test that can reliably detect and diagnose cardiac amyloidosis or quantify and monitor myocardial amyloid burden. Despite increasing disease awareness by health care providers, a prolonged diagnostic journey is common,⁸ with patients often consulting several specialists and receiving multiple imaging procedures before accurate diagnosis.  

ABOUT THE REVEAL STUDY

The REVEAL (“Research with I 124 Evuzamitide to Elucidate Cardiac AmyLoidosis”) study is an investigator-initiated Phase III clinical trial of the investigational diagnostic imaging agent I 124 evuzamitide in patients with suspected cardiac amyloidosis with Brigham and Women’s Hospital in Boston, MA, as the study sponsor.⁵

The main purpose of the study was to evaluate the efficacy and safety of the investigational radiotracer I 124 evuzamitide for diagnosing cardiac amyloidosis in participants with suspected cardiac amyloidosis compared to clinical standard of care (SoC) diagnosis. Secondary analyses assessed diagnostic performance in ATTR and AL subtypes. The imaging test used in this study was a positron emission tomography computed tomography (PET/CT) scan.

REVEAL is a multicentre, open-label, single-arm Phase III study conducted at 19 centres in the United States, evaluating 170 adults with suspected cardiac amyloidosis.  

Participants received a single intravenous dose of I 124 evuzamitide, followed by cardiac and partial-body PET/CT imaging, 3-5 hours post-injection. All PET/CT images were independently read by experienced cardiac PET physicians, assessing visual presence or absence of cardiac tracer uptake, blinded to clinical data. SoC diagnosis was independently adjudicated by clinical amyloidosis experts, blinded to PET results, using routine diagnostic data collected up to 60 days after imaging.

Diagnostic sensitivity and specificity of I 124 evuzamitide were determined using SoC diagnosis as the reference standard.  

ABOUT MOLECULAR IMAGING  

Molecular imaging allows clinicians to visualise and quantify biological processes at the molecular and cellular level in real time, enabling earlier disease detection and personalised treatment planning. Bayer is committed to advancing this field through technologies and strategic collaborations.

ABOUT RADIOLOGY AT BAYER

Bayer’s Radiology business is an established provider of medical imaging solutions, supporting radiology practice and patient care worldwide. The business transforms insight into technology and services with the goal of providing radiology solutions to help its customers enhance patient care. Its radiology portfolio features contrast agents and devices to help enable precise dose administration across modalities, equipment services, informatics and connected solution offerings.

ABOUT BAYER

Bayer is a global enterprise with core competencies in the life science fields of health care and nutrition. In line with its mission, “Health for all, Hunger for none,” the company’s products and services are designed to help people and the planet thrive by supporting efforts to master the major challenges presented by a growing and aging global population. Bayer is committed to driving sustainable development and generating a positive impact with its businesses. At the same time, the Group aims to increase its earning power and create value through innovation and growth. The Bayer brand stands for trust, reliability and quality throughout the world. In fiscal 2025, the Group employed around 88,000 people and had sales of 45.6 billion euros. R&D expenses amounted to 5.8 billion euros. For more information, go to www.bayer.co.uk. 

Forward-Looking Statements  

This release may contain forward-looking statements based on current assumptions and forecasts made by Bayer management. Various known and unknown risks, uncertainties and other factors could lead to material differences between the actual future results, financial situation, development or performance of the company and the estimates given here. These factors include those discussed in Bayer’s public reports which are available on the Bayer website at www.bayer.co.uk. The company assumes no liability whatsoever to update these forward-looking statements or to conform them to future events or developments.

References

1. Bayer Data on file.
2. Beighley, S. (2024, August 5). Attralus receives breakthrough therapy designation for its Pan-Amyloid Diagnostic Pet Imaging candidate 124i-evuzamitide (AT-01) for cardiac amyloidosis. Attralus. Available at: https://attralus.com/press-releases/attralus-receives-breakthrough-therapy-designation-for-its-pan-amyloid-diagnostic-pet-imaging-candidate-124i-evuzamitide-at-01-for-cardiac-amyloidosis. Last accessed: May 2026.  
3. Beighley, S. (2022, December 19). Attralus receives FDA and Ema Orphan designation for AT-01 (iodine (I-124) evuzamitide), an investigational diagnostic for the management of Al and Attr Amyloidosis. Attralus. Available at: https://attralus.com/press-releases/attralus-receives-fda-and-ema-orphan-designation-for-at-01-iodine-i-124-evuzamitide-an-investigational-diagnostic-for-the-management-of-al-and-attr-amyloidosis. Last accessed: May 2026.
4. Hester LL, Gifkins DM, Bellew KM, Vermeulen J, Schecter JM, Strony J, Dishy V, Weiss BM. “Diagnostic delay and characterization of the clinical prodrome in AL amyloidosis among 1523 US adults diagnosed between 2001 and 2019.” Eur J Haematol. 2021;107(4):428–435. doi:10.1111/ejh.13679;
5. REVEAL: Randomized EValuation of the Effects of Anacetrapib Through Lipid-modification (REVEAL). Clinical Trials.Gov. Available at: https://clinicaltrials.gov/study/NCT01252953. Last accessed: May 2026.  
6. Kim M, et al. Comparative Outcomes of a Transthyretin Amyloid Cardiomyopathy Cohort Versus Patients With Heart Failure With Preserved Ejection Fraction Enrolled in the TOPCAT Trial. Journal of the American Heart Association. 2023;12(15). https://doi.org/10.1161/JAHA.123.029705.
7. Cardiac Amyloidosis: Symptoms & Treatment. Cleveland Clinic. Available at: https://my.clevelandclinic.org/health/diseases/22598-cardiac-amyloidosis. Last accessed: May 2026.  
8. Dang D, et al. Gateway and journey of patients with cardiac amyloidosis. ESC Heart Fail. 2020 Oct;7(5):2418-2430. doi: 10.1002/ehf2.12793. Epub 2020 Jun 26. PMID: 32588554; PMCID: PMC7524246.

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