Bristol Myers Squibb Presents Positive Results from Phase 3 SCOUT-HCM Trial Demonstrating Efficacy and Safety of Camzyos (mavacamten) in Adolescents with Symptomatic Obstructive Hypertrophic Cardiomyopathy (oHCM)
Trial met its primary endpoint, demonstrating clinically meaningful and statistically significant reduction in Valsalva left ventricular outflow tract (LVOT) gradient at Week 28
Results demonstrate the potential for Camzyos to be the first targeted pharmacological therapy for the treatment of oHCM in adolescents
Safety profile of Camzyos in adolescents was similar to established profile in adults, with no new safety signals and no patients experiencing left ventricular ejection fraction (LVEF) of <50%
PRINCETON, N.J.–(BUSINESS WIRE)–Bristol Myers Squibb (NYSE: BMY) today announced positive data from the Phase 3 SCOUT-HCM trial of Camzyos (mavacamten), the first study of a cardiac myosin inhibitor (CMI) in adolescents (ages 12 years to <18 years) with symptomatic obstructive hypertrophic cardiomyopathy (oHCM). The SCOUT-HCM trial met its primary endpoint, demonstrating a clinically meaningful and statistically significant reduction from baseline in Valsalva left ventricular outflow tract (LVOT) gradient at Week 28 with Camzyos versus placebo, with a significant least-squares (LS) mean difference (95% CI) at Week 28 of −48.0 (−67.7, −28.3) mm Hg; P < 0.0001.
Additionally, Camzyos showed meaningful improvement over placebo in multiple secondary endpoints at 28 weeks, and similar safety findings were observed in the Camzyos and placebo groups. The data are being presented as a late-breaking clinical trial presentation at the American College of Cardiology’s (ACC) Annual Scientific Session & Expo 2026, with simultaneous publication in The New England Journal of Medicine.
“Pediatric HCM is a rare cardiac disorder that is associated with severe, sometimes life-threatening, symptoms,” said Joseph Rossano, MD, Principal Investigator of SCOUT-HCM and Chief of the Division of Cardiology at Children’s Hospital of Philadelphia. “With no approved therapies for pediatric patients with oHCM and current recommendations for pharmacological therapy primarily extrapolated from evidence obtained from adult studies, the positive results of this trial represent a significant advance in the field of pediatric cardiology and the potential for a meaningful new therapy for adolescent patients if approved by the FDA.”
SCOUT-HCM evaluated Camzyos compared to placebo in 44 patients aged 12 to <18 years old with symptomatic oHCM and New York Heart Association (NYHA) class II-III symptoms over a 28-week period. In addition to meeting the primary endpoint of reduction of Valsalva LVOT gradient, Camzyos showed meaningful improvements over placebo in LV obstruction, diastolic function, maximal left ventricular wall thickness, NYHA class, and mitral valve dysfunction at 28 weeks.
“The SCOUT-HCM results underscore the potential for Camzyos to become the first CMI for adolescents, reinforcing our leadership in the CMI space and our role in reshaping the scientific understanding of oHCM and how the disease is diagnosed, evaluated and potentially treated,” said Cristian Massacesi, MD, executive vice president, Chief Medical Officer and Head of Development, Bristol Myers Squibb. “With these meaningful safety and efficacy data, we are excited about the potential to provide a paradigm-changing treatment for adolescents and their families.”
Improvements were seen in resting and post-exercise LVOT gradients with Camzyos versus placebo, with an LS mean difference of −47.0 mm Hg (−62.7, −31.4); nominal p < 0.0001, and −41.7 mm Hg (−59.7, −23.7); nominal p < 0.0001, respectively. The primary endpoint was supported by the proportion of patients who achieved reduction in maximal LVOT gradient (resting or Valsalva) to <30 mm Hg, from baseline to 28 weeks.
Additionally, positive structural changes were observed with Camzyos versus placebo, as shown by improvement in maximal LV wall thickness LS mean difference (95% CI) of −1.8 (−3.4, −0.2) mm; nominal p = 0.0269 and average E/e’ ratio (ratio between early mitral inflow velocity and mitral annular early diastolic velocity) of LS mean difference (95% CI) of −3.4 (−5.1, −1.6); nominal p = 0.0002.
Similar safety findings were observed in the Camzyos and placebo groups, including treatment-emergent adverse events (TEAEs) (18 versus 17 participants experiencing at least 1 respectively), treatment-related TEAEs (2 versus 3, respectively), treatment-emergent serious adverse events (TESAEs) (2 for both groups), and treatment-related TESAEs (1 versus 0, respectively). During the 28-week study period, there were no TEAE‑related treatment discontinuations or deaths, no cases of atrial fibrillation or symptomatic heart failure, and no patient experienced a left ventricular ejection fraction (LVEF) of <50%. Overall, these findings demonstrate that the safety profile of Camzyos treatment in symptomatic adolescents with oHCM was similar to that reported in adults, with no new safety signals identified.
The 28-week active treatment period of SCOUT-HCM is ongoing, and Bristol Myers Squibb will work with key investigators to present the 56-week data at an upcoming medical congress.
About the Phase 3 SCOUT-HCM Trial
SCOUT-HCM (NCT06253221) is a Phase 3 randomized, double-blind, placebo-controlled, international trial that enrolled 44 adolescent patients (12 to <18 years old) with symptomatic oHCM. The trial includes three treatment periods totaling up to 200 weeks: a 28-week placebo-controlled period, followed by a 28-week active-treatment period (when patients randomized to placebo crossed over to Camzyos), and an open-label long-term extension period for up to 144 weeks.
The primary endpoint is change from baseline to Week 28 in Valsalva LVOT gradient. Secondary endpoints include efficacy parameters of resting and post-exercise LVOT gradients, peak oxygen consumption, symptoms and health status, plus safety and pharmacokinetic parameters.
Joseph Rossano, MD, is a paid consultant to Bristol Myers Squibb and served as the site principal investigator for the SCOUT-HCM study at Children’s Hospital of Philadelphia.
About Obstructive Hypertrophic Cardiomyopathy (oHCM) in Adolescent Patients
Hypertrophic cardiomyopathy (HCM) is a primary cardiac disorder that may result from known or suspected genetic defects in sarcomeric proteins of the cardiac myocyte or be due to unknown reasons (idiopathic). Adolescents with obstructive HCM suffer substantial morbidity largely related to reduced exertional tolerance. Though available treatments can lead to improvement in symptoms, they have significant limitations for adolescent patients (e.g., side effects from beta-blockers and risks of invasive procedures).
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 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 (e.g., serious infection) or arrhythmia (e.g., 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 findings in 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
Based on animal data, 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 www.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: Transforming Patients’ Lives Through Science
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, visit us at BMS.com and 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 any additional indication described in or suggested by this release in the currently anticipated timeline or at all, any marketing approvals, if granted, may have significant limitations on their use, and, if approved, whether Camzyos for such indication 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 Quarterly Reports on Form 10-Q, 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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