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Cytokinetics (NASDAQ: CYTK) logs Phase 3 win, plans FDA filing for heart drug

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Rhea-AI Filing Summary

CYTOKINETICS INC (CYTK) reported that its Phase 3 ACACIA-HCM trial of aficamten in symptomatic non-obstructive hypertrophic cardiomyopathy met both dual primary endpoints. At Week 36, aficamten produced statistically significant improvements versus placebo in Kansas City Cardiomyopathy Questionnaire Clinical Summary Score and peak oxygen uptake (pVO₂), with treatment effects of 3.0 points (p=0.021) and 0.67 ml/kg/min (p=0.003), respectively. Key secondary endpoints, including NYHA class improvement, composite CPET z-score and NT‑proBNP, also favored aficamten, though left atrial volume index and time to first cardiovascular event did not. Aficamten was generally well-tolerated but showed higher rates of serious adverse events, heart failure events, and LVEF <50% than placebo. Cytokinetics plans to submit a supplemental New Drug Application to the FDA in the fourth quarter of 2026 to expand MYQORZO (aficamten) from obstructive to non-obstructive HCM.

Positive

  • Phase 3 ACACIA-HCM met both dual primary endpoints in symptomatic non-obstructive HCM, with statistically significant benefits in KCCQ-CSS and pVO₂ versus placebo, supporting the potential label expansion of aficamten.
  • Global efficacy analysis showed 53% of aficamten patients achieved a clinical response in three or more outcome measures at 36 weeks versus 13% on placebo (p<0.001), indicating multi-domain disease impact.

Negative

  • Higher rates of serious adverse events and heart failure were observed with aficamten, including LVEF <50% in 10.5% of treated patients versus 0.8% on placebo, requiring close safety monitoring.
  • No statistical difference was seen for left atrial volume index change or time to first cardiovascular event, limiting evidence of benefit on some structural and hard clinical outcomes.

Filing Explained

Full ACACIA-HCM results are now published, but non-obstructive HCM expansion remains at the planned FDA-submission stage.

This Form 8-K reports that on August 28, 2026, Cytokinetics presented and published the full ACACIA-HCM Phase 3 results; the company plans a supplemental FDA application in the fourth quarter of 2026, so the disclosed next step is regulatory submission rather than an expanded indication.

An additional global efficacy analysis found that 53% of patients receiving aficamten had a clinical response in at least three of five outcome measures, compared with 13% receiving placebo.

The filing also reports that after a four-week aficamten washout, KCCQ-CSS declined from the end-of-treatment level to match the placebo group, indicating that the reported symptom-score difference was observed while treatment continued.

Item 8.01 Other Events Other
Voluntary disclosure of events the company deems important to shareholders but not covered by other items.
Item 9.01 Financial Statements and Exhibits Exhibits
Financial statements, pro forma financial information, or exhibit attachments filed with this report.
KCCQ-CSS treatment effect 3.0 points (95% CI 0.5–5.5) Least square mean difference from baseline to Week 36 for aficamten vs placebo
pVO₂ treatment effect 0.67 ml/kg/min (95% CI 0.22–1.1) Least square mean difference from baseline to Week 36 for aficamten vs placebo
NYHA class improvement on aficamten 108 patients (41.9%) Participants with ≥1 class improvement at Week 36
NYHA class improvement on placebo 72 patients (27.8%) Participants with ≥1 class improvement at Week 36
Patients with LVEF <50% on aficamten 27 patients (10.5%) Occurrence during ACACIA-HCM
Patients with LVEF <50% on placebo 2 patients (0.8%) Occurrence during ACACIA-HCM
ACACIA-HCM enrollment 517 participants Randomized and treated outside Japan on a 1:1 basis
Global efficacy responder rate on aficamten 53% Patients with clinical response in ≥3 outcome measures at 36 weeks
Kansas City Cardiomyopathy Questionnaire Clinical Summary Score medical
"dual primary endpoint was the change in Kansas City Cardiomyopathy Questionnaire Clinical Summary Score"
A patient-reported numeric score (0–100) that summarizes symptoms and physical limitations from heart failure, based on responses to the Kansas City Cardiomyopathy Questionnaire; higher values mean fewer symptoms and better daily functioning. Investors watch this score because it quantifies how much a treatment improves patients’ quality of life—similar to a customer satisfaction rating—and can influence regulatory approval, labeling, payer coverage, and commercial adoption.
pVO₂ medical
"change in maximal exercise performance (pVO2) from baseline to Week 36"
NT-proBNP medical
"NT-proBNP, a biomarker of cardiac wall stress"
A blood test marker released when the heart is under strain; higher NT‑proBNP levels indicate the heart is working harder or may be failing, similar to a dashboard warning light that signals engine stress. Investors watch NT‑proBNP because changes in the marker can drive clinical trial results, treatment approvals, hospital use, and insurance decisions for heart drugs and devices, all of which affect revenue, adoption and valuation in healthcare companies.
New York Heart Association (NYHA) Functional Class medical
"improvements compared to placebo were observed in key ranked secondary endpoints, including New York Heart Association (NYHA) Functional Class"
New York Heart Association (NYHA) functional class is a four-level system doctors use to describe how much a person’s heart condition limits ordinary physical activity, ranging from no symptoms with exertion to symptoms at rest. For investors it signals the severity of heart disease targeted by treatments or devices, influences clinical trial design and regulatory or reimbursement decisions, and helps forecast market size by showing how many patients need more advanced care—think of it as a simple activity “speedometer” for heart failure.
MYQORZO REMS Program regulatory
"MYQORZO is available only through a restricted program called the MYQORZO REMS Program"
non-obstructive hypertrophic cardiomyopathy medical
"aficamten in patients with symptomatic non-obstructive hypertrophic cardiomyopathy (nHCM)"
A form of heart disease where the heart muscle becomes abnormally thick and stiff but does not create a physical blockage that impedes blood exiting the heart. Think of a pump whose walls have thickened so it works less flexibly even though the doorway is clear. It matters to investors because it influences demand for treatments, clinical trial outcomes, healthcare costs, insurance risk, and workforce productivity, all of which can affect companies in medical, pharmaceutical, and insurance sectors.

FAQ

What did CYTK report about the ACACIA-HCM Phase 3 trial results?

Cytokinetics reported that ACACIA-HCM met both dual primary endpoints, showing statistically significant improvements at 36 weeks in KCCQ-CSS and pVO₂ for aficamten versus placebo, with consistent benefits across prespecified subgroups and several key secondary endpoints.

How much did aficamten improve symptoms and exercise capacity in ACACIA-HCM?

At Week 36, aficamten improved KCCQ-CSS by 11.4 points versus 8.4 for placebo (treatment effect 3.0; p=0.021) and increased pVO₂ by 0.64 ml/kg/min versus -0.03 for placebo (treatment effect 0.67; p=0.003).

What secondary efficacy results did Cytokinetics highlight for CYTK’s aficamten?

Key secondary endpoints favored aficamten, including 41.9% of patients improving ≥1 NYHA class versus 27.8% on placebo, and better composite CPET z-score and NT‑proBNP changes, while left atrial volume index and time to first cardiovascular event were not statistically different.

What safety findings were reported for aficamten in ACACIA-HCM?

Aficamten was generally well-tolerated but had higher rates of non-fatal discontinuations (7.0% vs 1.9%), serious adverse events (20.2% vs 14.7%), LVEF <50% (10.5% vs 0.8%), and heart failure events compared with placebo; most heart failure events responded to diuretics.

What regulatory plans did CYTK announce for aficamten after ACACIA-HCM?

Based on the positive ACACIA-HCM results, Cytokinetics plans to submit a supplemental New Drug Application to the U.S. FDA in the fourth quarter of 2026 for aficamten to treat adults with symptomatic non-obstructive HCM.

How many patients were enrolled in the ACACIA-HCM trial reported by CYTK?

ACACIA-HCM randomized and treated 517 participants with symptomatic non-obstructive HCM outside Japan, assigned 1:1 to aficamten or placebo with dose titration guided by echocardiography.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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false000106198300010619832026-08-282026-08-28

 

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

 

FORM 8-K

 

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 28, 2026

 

 

Cytokinetics, Incorporated

(Exact name of Registrant as Specified in Its Charter)

 

 

Delaware

000-50633

94-3291317

(State or Other Jurisdiction
of Incorporation)

(Commission File Number)

(IRS Employer
Identification No.)

 

 

 

 

 

350 Oyster Point Boulevard

 

South San Francisco, California

 

94080

(Address of Principal Executive Offices)

 

(Zip Code)

 

Registrant’s Telephone Number, Including Area Code: (650) 624-3000

 

n/a

(Former Name or Former Address, if Changed Since Last Report)

 

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:


Title of each class

 

Trading
Symbol(s)

 


Name of each exchange on which registered

Common Stock, $0.001 par value

 

CYTK

 

The Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

 


Item 8.01 Other Events.

On August 28, 2026, Cytokinetics, Incorporated issued a press release announcing its presentation of the full results of ACACIA-HCM at the European Society of Cardiology (ESC) Congress 2026 and published in the New England Journal of Medicine. The full text of the press release issued in connection with this announcement is incorporated herein as Exhibit 99.1 to this Current Report on Form 8-K.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

 

99.1 Press Release dated August 28, 2026

104 The cover page of this report has been formatted in Inline XBRL


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 hereunto duly authorized.

 

 

 

CYTOKINETICS, INCORPORATED

 

 

 

 

Date:

August 28, 2026

By:

/s/ John O. Faurescu

 

 

 

John O. Faurescu
SVP, Deputy General Counsel & Secretary

 


img114956760_0.gif

 

Cytokinetics Announces Positive Results from ACACIA-HCM

Presented in Hot Line Session at the European Society of Cardiology (ESC) Congress 2026 and Published in The New England Journal of Medicine

 

ACACIA-HCM is the First Phase 3 Clinical Trial to Successfully Demonstrate Statistically Significant Improvements Across Both Patient-Reported and Physician-Assessed Endpoints in Non-Obstructive HCM

 

Supplemental New Drug Application to be Submitted to FDA in Fourth Quarter

 

Company to Host Investor Event and Webcast Today at 2:00 PM Central European Summer Time (8:00 AM Eastern Time)

 

SOUTH SAN FRANCISCO, Calif., Aug. 28, 2026 - Cytokinetics, Incorporated (Nasdaq: CYTK) today announced the primary results from ACACIA-HCM (Assessment Comparing Aficamten to Placebo on Cardiac Endpoints In Adults with Non-Obstructive HCM), the pivotal Phase 3 clinical trial of aficamten in patients with symptomatic non-obstructive hypertrophic cardiomyopathy (nHCM) were presented in a Hot Line Session at the European Society of Cardiology (ESC) Congress 2026 in Munich, Germany, and simultaneously published in The New England Journal of Medicine.1

 

ACACIA-HCM met both dual primary endpoints, demonstrating statistically significant improvements from baseline to Week 36 compared to placebo in both Kansas City Cardiomyopathy Questionnaire Clinical Summary Score (KCCQ-CSS) and maximal exercise performance (pVO2). Results for the dual primary endpoint analysis consistently favored aficamten across prespecified subgroups studied.

 

“ACACIA-HCM is the first-ever positive clinical trial in non-obstructive HCM,” said Stephen Heitner, M.D., Cytokinetics’ Chief Medical Officer. “As shown in presentation and publication, the results from ACACIA-HCM are both statistically robust, consistent across prespecified subgroups and other secondary endpoints, and clinically impactful for these patients with non-obstructive HCM. As such, these data may potentially translate into a new treatment option for patients with HCM with no available medical treatments that directly address their underlying disease. If approved, we look forward to seeing aficamten become the first cardiac myosin inhibitor to treat the full spectrum of symptomatic HCM.”

 


“We are grateful to the patient community and the clinical trial team who contributed to the successful completion of ACACIA-HCM, a fitting tribute to the patients and families who have struggled with this disease for many years and across generations. We are also pleased that most of the eligible patients from ACACIA-HCM are continuing treatment with aficamten in FOREST-HCM,” said Ahmad Masri, M.D., M.S., Director, Hypertrophic Cardiomyopathy Center and Cardiac Amyloidosis Program, Oregon Health & Science University and Principal Investigator of ACACIA-HCM. “We look forward to applying this study’s groundbreaking scientific knowledge into clinical practice upon potential approval, addressing this area of HCM where patients do not have adequate treatment options.”

 

Based on the positive results from ACACIA-HCM, Cytokinetics plans to submit a supplemental New Drug Application to the U.S. Food and Drug Administration (FDA) for aficamten for the treatment of adult patients with symptomatic nHCM in the fourth quarter of 2026.

 

ACACIA-HCM: Efficacy

 

The baseline characteristics of patients enrolled in ACACIA-HCM were well-matched between treatment groups and consistent with a symptomatic nHCM phenotype with substantial disease burden despite normal left ventricular ejection fraction (LVEF).

 

There were two pre-specified primary endpoints, KCCQ-CSS and pVO₂, evaluated in parallel. For each endpoint, a p-value of 0.025 or less was considered statistically significant. Compared to placebo, treatment with aficamten demonstrated statistically significant improvements in both dual primary endpoints at 36 weeks (Table 1).

 

Table 1: Dual Primary Endpoint Results

 

Primary Endpoints

Change from Baseline to Week 36

LSM [95% CI]

Aficamten vs Placebo

LSM (95% CI)

P-value

 

Aficamten

Placebo

 

 

KCCQ-CSS

11.4 [9.6 – 13.2]

8.4 [6.6 – 10.2]

3.0 (0.5 - 5.5)

0.021

pVO2 (ml/kg/min)

0.64 [0.32 – 0.95]

-0.03 [-0.35 – 0.28]

0.67 (0.22 - 1.1)

0.003

LSM = least square mean; CI = confidence interval

 

Improvements in KCCQ-CSS relative to placebo were noted beyond titration and throughout the treatment period in participants treated with aficamten, such that patients remaining on treatment at 72 weeks demonstrated a least square mean (LSM) change from baseline in KCCQ-CSS of 7.0 points. Of note, following a washout of aficamten for four weeks, the KCCQ-CSS declined from the end of treatment for participants on aficamten to match that in the placebo group (Figure 1).


 

Figure 1: Assessment of KCCQ-CSS

 

img114956760_1.jpg

The figure is based on the observed data, except that the inset box of Week 36 LSM difference and p-value are from the primary analysis imputed data.

 

At Week 36, pVO2 increased for participants on aficamten while it remained unchanged for participants on placebo (Figure 2).

 

Figure 2: Assessment of pVO2

 

img114956760_2.jpg


 

The treatment effect of aficamten on both dual primary endpoints was consistent across all prespecified subgroups, including baseline LVEF, atrial fibrillation status, genotype, age, sex, whether patients were receiving background beta-blocker therapy and whether patients had intracavitary obstruction at baseline (Figure 3).

 

Figure 3: Pre-Specified Subgroups for KCCQ-CSS and pVO2

 

img114956760_3.jpg

 

Statistically significant improvements compared to placebo were observed in key ranked secondary endpoints, including New York Heart Association (NYHA) Functional Class, the composite z-score of two cardiopulmonary exercise testing (CPET) parameters (VE/VCO2 and pVO2), and NT-proBNP, a biomarker of cardiac wall stress. Statistical significance was not met on the endpoints of change from baseline in left atrial volume index or the time to first cardiovascular event for aficamten compared to placebo (Table 2).

 

Table 2: Secondary Endpoints

 

Secondary Endpoints

Change from Baseline to Week 36

LSM (95% CI)

Aficamten vs Placebo

Treatment Difference

(95% CI)

P-value

 

Aficamten

Placebo

 

 

Improvement of ≥1 NYHA class at week 36 – n (%)

108 (41.9)

72 (27.8)

14.1 (6.0 to 22.2)

<0.001


Change in composite z-score of two CPET parameters (pVO2 and VE/VCO2) at week 36

0.05 (-0.01 to 0.12)

-0.09 (-0.14 to -0.05)

0.14 (0.07 to 0.22)

<0.001

Proportional change in NT-proBNP level at week 36 – pg/ml

0.43 (0.39 to 0.46)

1.00 (0.93 to 1.08)

0.43 (0.38 to 0.47)

<0.001

Change in left atrial volume index at week 36

-0.17 (-1.12 to 0.79)

1.13 (0.19 to 2.08)

-1.30 (-2.64 to 0.04)

 

0.058

Time to first cardiovascular event – weeks

68.2 (66.2 to 70.2)

68.8 (66.9 to 70.7)

-0.6 (-3.3 to 2.2)

 

0.678

Treatment difference is from statistical modeling

 

ACACIA-HCM: Safety

 

Aficamten was generally well-tolerated in the study. Non-fatal adverse events that led to early study drug discontinuation occurred in 18 (7.0%) and 5 (1.9%) patients on aficamten and placebo, respectively. Serious adverse events occurred in 52 (20.2%) patients on aficamten compared to 38 (14.7%) patients on placebo. In the time to the first cardiovascular event endpoint, an event (cardiovascular death, heart transplantation or left ventricular assist device, aborted sudden cardiac death, non-fatal stroke, heart failure hospitalization, or cardiac arrhythmia [atrial fibrillation or ventricular tachyarrhythmia] requiring treatment or hospitalization) occurred in 22 (8.5%) patients in the aficamten arm and 20 (7.7%) in the placebo arm.

 

LVEF <50% occurred in 27 (10.5%) patients taking aficamten and in two (0.8%) patients taking placebo. At baseline, patients who experienced LVEF <50% tended to have lower LVEF, lower exercise capacity, and a higher frequency of atrial fibrillation history. Of the 27 patients with LVEF <50% on aficamten, 21 completed treatment while receiving the same or lower doses.

 

As previously reported, two participants on aficamten experienced a serious adverse event of heart failure associated with LVEF <50%. Ten additional patients on aficamten had serious adverse events of heart failure not associated with LVEF <50%, compared to three patients on placebo. All heart failure events in patients treated with aficamten occurred during dose titration or prior to Week 12 and were generally responsive to a short course of diuretic therapy.

 


ACACIA-HCM: Global Efficacy Analysis

 

An additional analysis from ACACIA-HCM was also presented during the Hot Line presentation which evaluated the global efficacy of aficamten in patients with symptomatic nHCM. The analysis assessed clinical improvements across five key domains: exercise capacity, cardiac structure, cardiac biomarkers, diastolic function and symptom burden.

 

At 36 weeks, treatment with aficamten demonstrated statistically significant improvements across all five efficacy metrics compared to placebo (p<0.001), with 53% of patients on aficamten demonstrating a clinical response in three or more outcome measures compared to only 13% of patients on placebo. These results help place the primary results into clinical context and underscore the opportunity to impact several aspects of disease burden by addressing the underlying pathobiology in patients living with symptomatic nHCM. The results from this sub-analysis were also published in Circulation.2

 

Investor Webcast Information

 

Cytokinetics will host an in-person investor event in Munich, Germany on August 28, 2026, at 2:00 PM Central European Summer Time (8:00 AM Eastern Time). The event will also be simultaneously webcast live online. Interested parties must register to attend in-person or online at https://acacia-hcm-investor-event-esc-2026.open-exchange.net/welcome.

 

Registered attendees may access the webcast by visiting the Investor & Media section of the Cytokinetics website at www.cytokinetics.com. The webcast replay will be archived on the Cytokinetics website for six months.

 

About ACACIA-HCM

 

ACACIA-HCM was a Phase 3, multi-center, randomized, double-blind, placebo-controlled clinical trial designed to evaluate the effect of aficamten compared to placebo in patients with symptomatic non-obstructive hypertrophic cardiomyopathy (nHCM). The dual primary endpoint was the change in Kansas City Cardiomyopathy Questionnaire (KCCQ) Clinical Summary Score and change in maximal exercise performance (pVO2) from baseline to Week 36.

 

Secondary endpoints included the proportion of participants with ≥1 class improvement in NYHA functional class, and changes in the composite z-score of two cardiopulmonary exercise testing (CPET) parameters of sub-maximal exercise performance (VE/VCO2 and pVO2), NT-proBNP, and left atrial volume index (LAVI) from baseline to Week 36. After 36 weeks of treatment, participants continued treatment with aficamten or placebo for up to 72 weeks to evaluate


additional secondary and exploration analyses including the time to first cardiovascular event. The trial (outside Japan) concluded when at least 200 patients completed 52 weeks of treatment.

 

ACACIA-HCM randomized and treated 517 participants (outside Japan) on a 1:1 basis with aficamten or placebo. Randomization was stratified by persistent atrial fibrillation and presence of intracavitary obstruction. At screening, participants enrolled in ACACIA-HCM were required to have resting left ventricular outflow tract gradient (LVOT-G) <30 mmHg and post-Valsalva LVOT‑G <50 mmHg in addition to left ventricular ejection fraction (LVEF) ≥60%, respiratory exchange ratio (RER) ≥1.00 and pVO2 ≤90% predicted, NT-proBNP ≥300 pg/mL or ≥900 pg/mL if atrial fibrillation or atrial flutter were present at screening, NYHA functional class II or III and KCCQ Clinical Summary Score ≤85.

 

Each patient received up to four escalating doses of aficamten or placebo based on echocardiographic guidance. Participants who received aficamten began with 5 mg dosed once daily. At weeks 2, 4 and 6 participants received an echocardiogram to determine if they would be up-titrated to escalating doses of 10, 15 or 20 mg. Dose escalation occurred only if a participant had an LVEF ≥60%. Participants who did not meet escalation criteria continued the same dose or were down-titrated if their LVEF was <50%.

 

About MYQORZO® (aficamten)

 

MYQORZO® (aficamten) is a cardiac myosin inhibitor approved in the U.S., China, European Union and United Kingdom for the treatment of symptomatic obstructive hypertrophic cardiomyopathy (oHCM). In patients with oHCM, myosin inhibition with MYQORZO reduces cardiac contractility and consequently, left ventricular outflow tract (LVOT) obstruction. MYQORZO was engineered to achieve a predictable exposure response, rapid onset of action and reversibility.3

 

Aficamten is also under clinical investigation in CEDAR-HCM in a pediatric population with oHCM. Safety and efficacy of aficamten have not been established in a pediatric patient population. In addition, aficamten is being studied in FOREST-HCM, an open-label extension clinical study.

 

INDICATION

 

MYQORZO is indicated for the treatment of adults with symptomatic obstructive hypertrophic cardiomyopathy (oHCM) to improve functional capacity and symptoms.

 

IMPORTANT SAFETY INFORMATION

 


WARNING: RISK OF HEART FAILURE

 

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

 

Echocardiogram assessments are required prior to and during treatment with MYQORZO to monitor for systolic dysfunction. Initiation of MYQORZO in patients with LVEF <55% is not recommended. Decrease the dose of MYQORZO if LVEF is <50% and ≥40%. Interrupt the dose of MYQORZO if LVEF <40% or if the patient experiences heart failure symptoms or worsening clinical status due to systolic dysfunction.

 

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

 

CONTRAINDICATIONS

 

MYQORZO is contraindicated with concomitant use of rifampin.

 

WARNINGS AND PRECAUTIONS

 

Heart Failure

 

MYQORZO reduces cardiac contractility, which can reduce LVEF and cause heart failure.

Patients who experience a serious intercurrent illness (eg, serious infection) or arrhythmia (eg, new or uncontrolled atrial fibrillation) may be at greater risk of developing systolic dysfunction and heart failure.

 

Assess patients’ clinical status and LVEF prior to and during treatment and adjust the MYQORZO dose accordingly. New or worsening arrhythmia, dyspnea, chest pain, fatigue, leg edema, or elevations in N-terminal pro-B-type natriuretic peptide may be signs and symptoms of heart failure.

 

Initiation of MYQORZO in patients with LVEF <55% is not recommended.

 

MYQORZO REMS Program

 

MYQORZO is available only through a restricted program called the MYQORZO REMS Program, because of the risk of heart failure due to systolic dysfunction.

 


Notable requirements of the MYQORZO REMS Program include:

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

 

Further information is available at www.MYQORZOREMS.com, or at 1-844-285-7367.

 

Cytochrome P450 Interactions Leading to Heart Failure or Loss of Effectiveness

 

MYQORZO is metabolized primarily by CYP2C9, and to a lesser extent by CYP3A, CYP2D6, and CYP2C19 enzymes. Initiation of medications that inhibit multiple P450 pathways of MYQORZO elimination (eg, fluconazole, voriconazole, or fluvoxamine) or strong CYP2C9 inhibitors, and discontinuation of moderate-to-strong CYP3A inducers may lead to increased blood concentrations of aficamten and increase the risk of heart failure due to systolic dysfunction. Conversely, initiation of medications that induce P450 pathways of MYQORZO (eg, rifampin, moderate-to-strong CYP3A inducers) may lead to decreased blood concentrations of aficamten and potential loss of effectiveness. Assess LVEF 2 to 8 weeks after initiation of such inhibitors or after discontinuation of such inducers and adjust the dose of MYQORZO accordingly.

 

Advise patients of the potential for drug interactions. Advise patients to inform their healthcare provider of all concomitant medications prior to and during MYQORZO treatment.

 

ADVERSE REACTIONS

 

Hypertension (8% vs 2%) was the only adverse reaction occurring in >5% of patients and more commonly on MYQORZO than on placebo in the pivotal trial.

 

INDICATIONS AND USAGE

 

MYQORZO is indicated for the treatment of adults with symptomatic obstructive hypertrophic cardiomyopathy (oHCM) to improve functional capacity and symptoms.

 

Please see full Prescribing Information approved in the U.S., including Boxed WARNING.

 

Please see full Summary of Product Characteristics approved in the European Union.

 

About Hypertrophic Cardiomyopathy


 

Hypertrophic cardiomyopathy (HCM) is a disease in which the heart muscle becomes abnormally thick. HCM can be obstructive, when thickened muscle blocks blood flow, or non-obstructive, when blood flow is not blocked but heart function is still affected. In obstructive HCM, the thickening of cardiac muscle leads to the inside of the left ventricle becoming smaller, stiffer and less able to relax and fill with blood. Ultimately, HCM limits the heart’s pumping function, leading to reduced exercise capacity and a variety of symptoms.

 

HCM is the most common monogenic inherited cardiovascular disorder, affecting approximately 1 out of 350 individuals worldwide.4

 

Approximately half of patients with HCM have obstructive HCM (oHCM) and half have non-obstructive HCM (nHCM).5

 

People with HCM are at high risk of also developing cardiovascular complications including atrial fibrillation, stroke and mitral valve disease.6 People with HCM are at risk for potentially fatal ventricular arrhythmias and it is one of the leading causes of sudden cardiac death in younger people or athletes.7 A subset of patients with HCM are at high risk of progressive disease leading to dilated cardiomyopathy and heart failure necessitating cardiac transplantation.

 

About Cytokinetics

 

Cytokinetics is a specialty cardiovascular biopharmaceutical company, building on its over 25 years of pioneering scientific innovations in muscle biology, and advancing a pipeline of potential new medicines for patients suffering from diseases of cardiac muscle dysfunction. Cytokinetics’ MYQORZO® (aficamten) is a cardiac myosin inhibitor approved in the approved in the U.S., China, European Union and United Kingdom for the treatment of adults with symptomatic obstructive hypertrophic cardiomyopathy (oHCM). Following positive results in ACACIA-HCM, a Phase 3 clinical trial of aficamten in patients with non-obstructive HCM (nHCM), the company plans to submit a Supplemental New Drug Application in Q4 2026. Cytokinetics is also developing omecamtiv mecarbil, an investigational cardiac myosin activator for the potential treatment of patients with heart failure with severely reduced ejection fraction and ulacamten, an investigational cardiac myosin inhibitor for the potential treatment of heart failure with preserved ejection fraction, while continuing pre-clinical research and development in muscle biology.

 

For additional information about Cytokinetics, visit www.cytokinetics.com and follow us on X, LinkedIn, Facebook and YouTube.

 

Forward-Looking Statements

 


This press release contains forward-looking statements for purposes of the Private Securities Litigation Reform Act of 1995 (the “Act”). Cytokinetics disclaims any intent or obligation to update these forward-looking statements and claims the protection of the Act’s Safe Harbor for forward-looking statements. Examples of such statements include, but are not limited to, statements relating to our ability to obtain regulatory approval for aficamten in nonobstructive hypertrophic cardiomyopathy in any jurisdiction by any particular date, if ever, the number of patients comprising the eligible treatment population for aficamten, or market acceptance of aficamten for the treatment of nonobstructive hypertrophic cardiomyopathy. Such statements are based on management’s current expectations, but actual results may differ materially due to various risks and uncertainties, including, but not limited to, potential difficulties or delays in the development, testing, regulatory approvals for trial commencement, progression or product sale or manufacturing of Cytokinetics’ drug candidates that could slow or prevent clinical development or product approval; Cytokinetics’ drug candidates may have adverse side effects or inadequate therapeutic efficacy; the FDA or foreign regulatory agencies may delay or limit Cytokinetics’ ability to conduct clinical trials; Cytokinetics may be unable to obtain or maintain patent or trade secret protection for its intellectual property; standards of care may change, rendering Cytokinetics’ drug candidates obsolete; and competitive products or alternative therapies may be developed by others for the treatment of indications Cytokinetics’ drug candidates and potential drug candidates may target. For further information regarding these and other risks related to Cytokinetics’ business, investors should consult Cytokinetics’ filings with the Securities and Exchange Commission.

 

CYTOKINETICS® and the CYTOKINETICS C-shaped logo are registered trademarks of Cytokinetics in the U.S. and certain other countries.

 

MYQORZO® is a registered trademark of Cytokinetics in the U.S., the European Union and the United Kingdom.

 

References

 

1.
Masri A, et al. Aficamten for symptomatic nonobstructive hypertrophic cardiomyopathy. N Engl J Med. 2026
2.
Maron MS, et al. Global Efficacy of Aficamten in Nonobstructive Hypertrophic Cardiomyopathy: Results From ACACIA-HCM. Circ. 2026
3.
Maron, MS, et al. Aficamten for Symptomatic Obstructive Hypertrophic Cardiomyopathy. N Engl J Med. doi:10.1056/NEJMoa2401424.
4.
Tsenov et al. Healthcare access, symptom burden, and psychological impact in hypertrophic cardiomyopathy: a multinational patient-driven survey. Int J Cardiol Cardiovasc Risk Prev2025 Aug 4;27:200485. doi:10.1016/j.ijcrp.2025.200485.

5.
Butzner M, et al. Epidemiology of Hypertrophic Cardiomyopathy in the United States From 2016 to 2023. JACC Adv. 2026. 2026;5(2):102552. doi:10.1016/j.jacadv.2025.102552.
6.
Gersh, B.J., Maron, B.J., Bonow, R.O., Dearani, J.A., Fifer, M.A., Link, M.S., et al. 2011 ACCF/AHA guidelines for the diagnosis and treatment of hypertrophic cardiomyopathy. A report of the American College of Cardiology Foundation/American Heart Association Task Force on practice guidelines. Journal of the American College of Cardiology and Circulation, 58, e212-260.
7.
Hong Y, Su WW, Li X. Risk factors of sudden cardiac death in hypertrophic.

 

Contact:
Cytokinetics
Diane Weiser
Senior Vice President, Corporate Affairs
(415) 290-7757


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