Positive Phase 3 results of SCOUT-HCM trial highlight potential of Camzyos to be the first cardiac myosin inhibitor for the treatment of adolescents with symptomatic obstructive hypertrophic cardiomyopathy (oHCM)

New real-world evidence further reinforces the long-term, consistent efficacy and safety profile of Camzyos across diverse patient populations in oHCM

Bristol Myers Squibb (NYSE:BMY) today announced the presentation of new clinical trial and real-world data for Camzyos (mavacamten) at the American College of Cardiology's (ACC) Annual Scientific Session & Expo, taking place March 28–30, 2026, in New Orleans, Louisiana. Presentations at ACC will build upon the most comprehensive and mature evidence base in symptomatic obstructive hypertrophic cardiomyopathy (oHCM), further establishing Camzyos as a paradigm-shifting therapy across a range of patient populations. New data include multiple real-world data analyses demonstrating the consistent effectiveness and safety profile of Camzyos in adults, as well as full results from SCOUT-HCM, the first Phase 3 clinical trial evaluating a cardiac myosin inhibitor (CMI) as a potential treatment for adolescents with oHCM.

"Camzyos has redefined the standard of care for oHCM treatment in adults, which is further supported by the long-term and real-world data being presented during the meeting," said Cristian Massacesi, MD, executive vice president, Chief Medical Officer and Head of Development, Bristol Myers Squibb. "We also look forward to presenting data from the SCOUT-HCM study that supports the potential of Camzyos in adolescents with oHCM, a patient population whose current treatment options are limited to symptom management."

Key presentations at ACC 2026 include:

A late-breaking oral presentation of results from SCOUT-HCM, a Phase 3 randomized, double-blind, placebo-controlled international trial, which found Camzyos achieved its primary endpoint and several secondary endpoints around its efficacy and safety profile in adolescent patients with symptomatic oHCM.
A moderated poster presentation from DISCOVER-HCM, an ongoing observational, multicenter, retrospective and prospective study of patients with symptomatic oHCM in the U.S. and Puerto Rico evaluating the real-world safety and effectiveness profile of Camzyos, with results consistent with those seen in clinical trials.
New data from MARVEL-HCM provide real-world insight into Camzyos use among patients with symptomatic oHCM in the U.S. These findings describe the consistent and sustained effectiveness and safety profile of Camzyos in the real-world setting, while underscoring the importance of systematically assessing for obstructive physiology—including with provocation—to accurately characterize HCM subtype, improve disease recognition, and align patients with guideline-recommended treatment strategies.
Real-world outcomes from COMPASS-HCM, a prospective, observational study of patients with symptomatic oHCM in the U.S., highlighting the positive impact of Camzyos treatment on patient-reported quality of life and health status changes in as early as two weeks of treatment. These findings spotlight the meaningfulness of improvement in patient-reported outcome (PRO) measures to patients, also captured in their own words.

Select abstracts sponsored by Bristol Myers Squibb to be presented at ACC.26 can be found below. Complete abstracts can be accessed online here. Learn more about Bristol Myers Squibb's scientific approach to and resources on cardiovascular diseases on BMS.com.

Abstract Title	Primary Author	Type	Session Title	Date/Time (CDT)
The real-world safety and effectiveness of mavacamten for obstructive hypertrophic cardiomyopathy: Insights from the US sites of DISCOVER-HCM registry	Januzzi, J.	Moderated Poster	Evolving Forces: Modern Therapies and Phenotypes in Hypertrophic Cardiomyopathy	Saturday, March 28 9:42 AM-9:49 AM
Mavacamten demonstrates clinical and hemodynamic benefits in symptomatic obstructive hypertrophic cardiomyopathy with only provocable outflow gradients: Real-world experience from MARVEL-HCM	Alsidawi, S.	Moderated Poster	Translating Myosin Inhibition into Functional Recovery in Hypertrophic Cardiomyopathy	Saturday, March 28 9:42 AM-9:49 AM
Rapid improvement in patient-reported health status during initiation of mavacamten therapy for symptomatic, obstructive hypertrophic cardiomyopathy: Interim results of the COMPASS-HCM study	Wang, A.	Moderated Poster	Translating Myosin Inhibition into Functional Recovery in Hypertrophic Cardiomyopathy	Saturday, March 28 9:54 AM-10:01 AM
Real-world patient-perceived meaningfulness of change in obstructive hypertrophic cardiomyopathy: A qualitative interview study	Zhong, Y.	Poster	Heart Failure and Cardiomyopathies 02	Saturday, March 28 11:00 AM-12:00 PM
Effectiveness and safety of mavacamten in a cohort with high background prevalence of atrial fibrillation: Real-world experience from MARVEL-HCM	Harper, M.	Poster	Heart Failure and Cardiomyopathies 04	Saturday, March 28 2:00 PM-3:00 PM
Mavacamten in symptomatic adolescent patients with obstructive hypertrophic cardiomyopathy: Results from the Phase 3 SCOUT-HCM trial	Rossano, J.	Oral Presentation	Late-Breaking Clinical Trials IV	Sunday, March 29 11:30 AM-11:40 AM
Real-world evidence from the MARVEL-HCM multicenter study of mavacamten — a sex-based analysis of baseline characteristics and cardiac structural and functional changes	Martinez, M.W.	Moderated Poster	Comparative Efficacy, Sex Differences and Evolving Evidence of Cardiac Myosin Inhibitors in HCM	Monday, March 30 11:00 AM-11:07 AM

About CAMZYOS^® (mavacamten)

CAMZYOS^® (mavacamten) is the most extensively studied cardiac myosin inhibitor (CMI), approved by regulatory bodies in more than 60 countries and regions across five continents worldwide. In the U.S., CAMZYOS is indicated for the treatment of adults with symptomatic New York Heart Association (NYHA) class II-III obstructive hypertrophic cardiomyopathy (oHCM) to improve functional capacity and symptoms. In the European Union, CAMZYOS is indicated for the treatment of symptomatic (NYHA, class II-III) oHCM in adult patients.

A selective, reversible, allosteric inhibitor of cardiac myosin, CAMZYOS targets hypercontractility, the source of oHCM. Reduction in cardiac contractility with CAMZYOS treatment leads to reduced LVOT obstruction, improved energy consumption, and lower cardiac filling pressures in oHCM patients. These effects translate to improvements in symptoms for patients with symptomatic oHCM, enabling them to be more active in their daily lives. CAMZYOS can be used with or without background therapies, including for newly diagnosed patients.

CAMZYOS is supported by the largest body of worldwide evidence in the CMI treatment class, with up to five years of follow up across multiple long-term evidence and real-world studies, demonstrating the consistent and sustained benefits of CAMZYOS to improve symptoms and impact cardiac structure. CAMZYOS has been prescribed by more than 4,500 healthcare providers (HCPs) to more than 22,000 patients in the U.S. alone.

Bristol Myers Squibb: Changing the Course of Cardiovascular Disease

Bristol Myers Squibb is inspired by a single vision – transforming patients' lives through science. Cardiovascular disease is the leading cause of death worldwide, and despite major advances in how we prevent and treat it, the human and societal burden continues to worsen each year. Whether a cardiovascular disease that affects millions of people around the world, or a rarer condition, the need is the same: new and better treatment options that allow people to continue to live their fullest lives.

Bristol Myers Squibb is committed to developing new treatments to address the global burden of cardiovascular disease. Building on our 70-year legacy of discovering and delivering paradigm-changing cardiovascular medicines, we are leveraging our experience and expertise to take cardiovascular research to the next level and deliver meaningful, life-changing outcomes for patients.

CAMZYOS U.S. IMPORTANT SAFETY INFORMATION

WARNING: RISK OF HEART FAILURE

CAMZYOS reduces left ventricular ejection fraction (LVEF) and can cause heart failure due to systolic dysfunction.

Echocardiogram assessments of LVEF are required prior to and during treatment with CAMZYOS. Initiation of CAMZYOS in patients with LVEF <55% is not recommended. Interrupt CAMZYOS if LVEF is <50% at any visit or if the patient experiences heart failure symptoms or worsening clinical status.

Concomitant use of CAMZYOS with certain cytochrome P450 inhibitors or discontinuation of certain cytochrome P450 inducers may increase the risk of heart failure due to systolic dysfunction; therefore, the use of CAMZYOS is contraindicated with the following:

Strong CYP2C19 inhibitors
Moderate to strong CYP2C19 inducers or moderate to strong CYP3A4 inducers

Because of the risk of heart failure due to systolic dysfunction, CAMZYOS is available only through a restricted program under a Risk Evaluation and Mitigation Strategy (REMS) called the CAMZYOS REMS PROGRAM.

CONTRAINDICATIONS

CAMZYOS is contraindicated with concomitant use of:

Strong CYP2C19 inhibitors
Moderate to strong CYP2C19 inducers or moderate to strong CYP3A4 inducers

WARNINGS AND PRECAUTIONS

Heart Failure

CAMZYOS reduces systolic contraction and can cause heart failure or significantly reduce ventricular function. Patients who experience a serious intercurrent illness (eg, serious infection) or arrhythmia (eg, atrial fibrillation or other uncontrolled tachyarrhythmia) are at greater risk of developing systolic dysfunction and heart failure.

Assess the patient's clinical status and LVEF prior to and regularly during treatment and adjust the CAMZYOS dose accordingly. New or worsening arrhythmia, dyspnea, chest pain, fatigue, palpitations, leg edema, or elevations in N-terminal pro-B-type natriuretic peptide (NT-proBNP) may be signs and symptoms of heart failure and should also prompt an evaluation of cardiac function.

Asymptomatic LVEF reduction, intercurrent illnesses, and arrhythmias require additional dosing considerations.

Initiation of CAMZYOS in patients with LVEF <55% is not recommended. Avoid concomitant use of CAMZYOS in patients on disopyramide, ranolazine, verapamil with a beta blocker, or diltiazem with a beta blocker as these medications and combinations increase the risk of left ventricular systolic dysfunction and heart failure symptoms and clinical experience is limited.

CYP450 Drug Interactions Leading to Heart Failure or Loss of Effectiveness

CAMZYOS is primarily metabolized by CYP2C19 and CYP3A4 enzymes. Concomitant use of CAMZYOS and drugs that interact with these enzymes may lead to life-threatening drug interactions such as heart failure or loss of effectiveness.

Advise patients of the potential for drug interactions, including with over-the-counter medications (such as omeprazole, esomeprazole, or cimetidine). Advise patients to inform their healthcare provider of all concomitant products prior to and during CAMZYOS treatment.

CAMZYOS Risk Evaluation and Mitigation Strategy (REMS) Program

CAMZYOS is only available through a restricted program called the CAMZYOS REMS Program because of the risk of heart failure due to systolic dysfunction. Notable requirements of the CAMZYOS REMS Program include the following:

Prescribers must be certified by enrolling in the REMS Program
Patients must enroll in the REMS Program and comply with ongoing monitoring requirements
Pharmacies must be certified by enrolling in the REMS Program and must only dispense to patients who are authorized to receive CAMZYOS
Wholesalers and distributors must only distribute to certified pharmacies

Further information is available at www.CAMZYOSREMS.com or by telephone at 1-833-628-7367.

Embryo-Fetal Toxicity

CAMZYOS may cause fetal toxicity when administered to a pregnant female, based on animal studies. Confirm absence of pregnancy in females of reproductive potential prior to treatment and advise patients to use effective contraception during treatment with CAMZYOS and for 4 months after the last dose. Combined hormonal contraceptives (CHCs) containing a combination of ethinyl estradiol and norethindrone may be used with CAMZYOS. However, CAMZYOS may reduce the effectiveness of certain other CHCs. If these CHCs are used, advise patients to add nonhormonal contraception (such as condoms) during concomitant use and for 4 months after the last dose of CAMZYOS.

ADVERSE REACTIONS

In the EXPLORER-HCM trial, adverse reactions occurring in >5% of patients and more commonly in the CAMZYOS group than in the placebo group were dizziness (27% vs 18%) and syncope (6% vs 2%). There were no new adverse reactions identified in VALOR-HCM.

Effects on Systolic Function

In the EXPLORER-HCM trial, mean (SD) resting LVEF was 74% (6) at baseline in both treatment groups. Mean (SD) absolute change from baseline in LVEF was -4% (8) in the CAMZYOS group and 0% (7) in the placebo group over the 30-week treatment period. At Week 38, following an 8-week interruption of trial drug, mean LVEF was similar to baseline for both treatment groups. In the EXPLORER-HCM trial, 7 (6%) patients in the CAMZYOS group and 2 (2%) patients in the placebo group experienced reversible reductions in LVEF <50% (median 48%: range 35-49%) while on treatment. In all 7 patients treated with CAMZYOS, LVEF recovered following interruption of CAMZYOS.

DRUG INTERACTIONS

Potential for Other Drugs to Affect Plasma Concentrations of CAMZYOS

CAMZYOS is primarily metabolized by CYP2C19 and to a lesser extent by CYP3A4 and CYP2C9. Inducers and inhibitors of CYP2C19 and moderate to strong inhibitors or inducers of CYP3A4 may affect the exposures of CAMZYOS.

Impact of Other Drugs on CAMZYOS:

Strong CYP2C19 Inhibitors: Concomitant use increases CAMZYOS exposure, which may increase the risk of heart failure due to systolic dysfunction. Concomitant use is contraindicated.
Moderate to Strong CYP2C19 Inducers or Moderate to Strong CYP3A4 Inducers: Concomitant use decreases CAMZYOS exposure, which may reduce CAMZYOS' efficacy. The risk of heart failure due to systolic dysfunction may increase with discontinuation of these inducers as the levels of induced enzyme normalizes. Concomitant use is contraindicated.
Weak CYP2C19 Inhibitors or Moderate CYP3A4 Inhibitors: Concomitant use with a weak CYP2C19 inhibitor or a moderate CYP3A4 inhibitor increases CAMZYOS exposure, which may increase the risk of adverse drug reactions. Initiate CAMZYOS at the recommended starting dose of 5 mg orally once daily in patients who are on stable therapy with a weak CYP2C19 inhibitor or a moderate CYP3A4 inhibitor. Reduce dose of CAMZYOS by one level (ie, 15 to 10 mg, 10 to 5 mg, or 5 to 2.5 mg) in patients who are on CAMZYOS treatment and intend to initiate a weak CYP2C19 inhibitor or a moderate CYP3A4 inhibitor. Schedule clinical and echocardiographic assessment 4 weeks after inhibitor initiation, and do not up-titrate CAMZYOS until 12 weeks after inhibitor initiation. Avoid initiation of concomitant weak CYP2C19 and moderate CYP3A4 inhibitors in patients who are on stable treatment with 2.5 mg of CAMZYOS because a lower dose is not available. For short-term use (eg, 1 week), interrupt CAMZYOS for the duration of treatment with a weak inhibitor of CYP2C19 or a moderate inhibitor of CYP3A4. CAMZYOS may be reinitiated at the previous dose immediately on discontinuation of concomitant therapy.
Moderate CYP2C19 Inhibitors or Strong CYP3A4 Inhibitors: Concomitant use with a moderate CYP2C19 inhibitor or strong CYP3A4 inhibitor increases CAMZYOS exposure, which may increase the risk of adverse drug reactions. Discontinuing use of a moderate CYP2C19 inhibitor or strong CYP3A4 inhibitor after long-term concomitant use may decrease CAMZYOS exposure, which may reduce CAMZYOS' efficacy. Initiate CAMZYOS at a starting dosage of 2.5 mg orally once daily in patients who are on a stable therapy with a moderate CYP2C19 inhibitor or a strong CYP3A4 inhibitor. Reduce dose of CAMZYOS by one level (ie, 15 to 10 mg, 10 to 5 mg, or 5 to 2.5 mg) in patients who are on CAMZYOS and intend to initiate a moderate CYP2C19 inhibitor or a strong CYP3A4 inhibitor. Avoid initiation of concomitant moderate CYP2C19 and strong CYP3A4 inhibitors in patients who are on a stable treatment with 2.5 mg of CAMZYOS because a lower dose is not available. An increase in dose of CAMZYOS may be needed if the moderate inhibitor of CYP2C19 or strong inhibitor of CYP3A4 is discontinued after long-term concomitant use. Monitor for new or worsening symptoms. For short-term use (ie, when CAMZYOS dose modification is not feasible), interrupt CAMZYOS for the duration of treatment with a moderate inhibitor of CYP2C19 or a strong inhibitor of CYP3A4. CAMZYOS may be reinitiated at the previous dose immediately on discontinuation of concomitant therapy.

Potential for CAMZYOS to Affect Plasma Concentrations of Other Drugs

CAMZYOS is an inducer of CYP3A4, CYP2C9, and CYP2C19. Concomitant use with CYP3A4, CYP2C9, or CYP2C19 substrates may reduce plasma concentration of these drugs. Closely monitor when CAMZYOS is used with concomitant CYP3A4, CYP2C9, or CYP2C19 substrates unless otherwise recommended in the Prescribing Information.

Certain Combined Hormonal Contraceptives (CHCs): Progestin and ethinyl estradiol are CYP3A4 substrates. Concomitant use of CAMZYOS may decrease exposures of certain progestins, which may lead to contraceptive failure. CHCs containing a combination of ethinyl estradiol and norethindrone may be used with CAMZYOS, but if other CHCs are used, advise patients to add nonhormonal contraception (such as condoms) or use an alternative contraceptive method that is not affected by CYP450 enzyme induction (eg, intrauterine system) during concomitant use and for 4 months after the last dose of CAMZYOS.

Drugs That Reduce Cardiac Contractility

Expect additive negative inotropic effects of CAMZYOS and other drugs that reduce cardiac contractility. Avoid concomitant use of CAMZYOS in patients on disopyramide, ranolazine, verapamil with a beta blocker, or diltiazem with a beta blocker as these medications and combinations increase the risk of left ventricular systolic dysfunction and heart failure symptoms and clinical experience is limited.

If concomitant therapy with a negative inotrope is initiated, or if the dose of a negative inotrope is increased, monitor LVEF closely until stable doses and clinical response have been achieved.

SPECIFIC POPULATIONS

Pregnancy

CAMZYOS may cause fetal harm when administered to a pregnant female. Advise pregnant females about the potential risk to the fetus with maternal exposure to CAMZYOS during pregnancy. There is a pregnancy safety study for CAMZYOS. If CAMZYOS is administered during pregnancy, or if a patient becomes pregnant while receiving CAMZYOS or within 4 months after the last dose of CAMZYOS, healthcare providers should report CAMZYOS exposure by contacting Bristol Myers Squibb at 1-800-721-5072 or BMS.com.

Lactation

The presence of CAMZYOS in human or animal milk, the drug's effects on the breastfed infant, or the effects on milk production are unknown. The developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for CAMZYOS and any potential adverse effects on the breastfed child from CAMZYOS or from the underlying maternal condition.

Females and Males of Reproductive Potential

Confirm absence of pregnancy in females of reproductive potential prior to initiation of CAMZYOS. Advise females of reproductive potential to use effective contraception during treatment with CAMZYOS and for 4 months after the last dose. CHCs containing a combination of ethinyl estradiol and norethindrone may be used with CAMZYOS. However, CAMZYOS may reduce the effectiveness of certain other CHCs. If these CHCs are used, advise patients to add nonhormonal contraception (such as condoms) or use an alternative contraceptive method during concomitant use and for 4 months after the last dose of CAMZYOS.

Please see U.S. Full Prescribing Information, including Boxed WARNING and Medication Guide.

About Bristol Myers Squibb

At Bristol Myers Squibb, our mission is to discover, develop and deliver innovative medicines that help patients prevail over serious diseases. We are pursuing bold science to define what's possible for the future of medicine and the patients we serve. For more information about Bristol Myers Squibb, visit us at BMS.com or follow us on LinkedIn, X, YouTube, Facebook and Instagram.

Cautionary Statement Regarding Forward-Looking Statements

This press release contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995 regarding, among other things, the research, development and commercialization of pharmaceutical products. All statements that are not statements of historical facts are, or may be deemed to be, forward-looking statements. Such forward-looking statements are based on current expectations and projections about our future financial results, goals, plans and objectives and involve inherent risks, assumptions and uncertainties, including internal or external factors that could delay, divert or change any of them in the next several years, that are difficult to predict, may be beyond our control and could cause our future financial results, goals, plans and objectives to differ materially from those expressed in, or implied by, the statements. These risks, assumptions, uncertainties and other factors include, among others, that future study results may not be consistent with the results to date, that CAMZYOS (mavacamten) may not receive regulatory approval for the indications described in this release, including but not limited to treatment for adolescents with oHCM, any marketing approvals, if granted, may have significant limitations on their use, and, if approved, whether such products for such indications will be commercially successful. No forward-looking statement can be guaranteed. Forward-looking statements in this press release should be evaluated together with the many risks and uncertainties that affect Bristol Myers Squibb's business and market, particularly those identified in the cautionary statement and risk factors discussion in Bristol Myers Squibb's Annual Report on Form 10-K for the year ended December 31, 2025, as updated by our subsequent Current Reports on Form 8-K and other filings with the Securities and Exchange Commission. The forward-looking statements included in this document are made only as of the date of this document and except as otherwise required by applicable law, Bristol Myers Squibb undertakes no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events, changed circumstances or otherwise.

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Bristol Myers Squibb Reinforces Leadership in oHCM with New Camzyos (mavacamten) Data at American College of Cardiology Annual Scientific Session & Expo 2026 (ACC.26)