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CK-3773274

Phase 2

Hypertrophic Cardiomyopathy (HCM) | Small molecule | Cardiovascular |Cytokinetics, Incorporated|Last Updated: Feb 24, 2026

Success Probability

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment96

FDA Designations

No designations recorded

Clinical trial landscape

CK-3773274 · 1 trial · 1 indication

Phase 2 1
NCT04219826Dose-finding Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of CK-3773274 in Adults With Hypertrophic CardiomyopathyHypertrophic Cardiomyopathy (HCM)
COMPLETED96 Analytics
PHASE2COMPLETED
Dose-finding Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of CK-3773274 in Adults With Hypertrophic Cardiomyopathy
Hypertrophic Cardiomyopathy (HCM)Unlock trial analytics

Study Endpoints

Primary Endpoints

Incidence of Adverse Events (AEs)
14 weeks

Participant incidence of reported AEs to determine the safety and tolerability of aficamten in participants with HCM.

Incidence of Left Ventricular Ejection Fraction (LVEF) < 50%
14 weeks

Participant incidence of LVEF \< 50% as assessed by the core laboratory assessment.

Incidence of Serious Adverse Events (SAEs)
14 weeks

Participant incidence of reported SAEs to determine the safety and tolerability of aficamten in participants with symptomatic HCM.

Secondary Endpoints

Slope of the Relationship of the Plasma Concentration of CK-3773274 to the Change From Baseline in the Resting Left Ventricular Outflow Track Gradient (LVOT-G)
Baseline and 10 weeks
Slope of the Relationship of the Plasma Concentration of CK-3773274 to the Change From Baseline in the Post-Valsalva LVOT-G
Baseline and 10 Weeks
Change From Baseline in Resting LVOT-G Over Time as a Function of Dose.
Baseline and 10 Weeks
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1 (oHCM) - AficamtenEXPERIMENTALParticipants received CK-3773274 doses of 5 - 15 mg once daily with dose levels guided by echocardiography assessments for up to 10 weeks
Cohort 1 (oHCM) - PlaceboPLACEBO_COMPARATORParticipants received placebo once daily for up to 10 weeks
Cohort 2 (oHCM) - AficamtenEXPERIMENTALParticipants received CK-3773274 doses 10 - 30 mg once daily with dose levels guided by echocardiography assessments for up to 10 weeks
Cohort 2 (oHCM) - PlaceboPLACEBO_COMPARATORParticipants received placebo once daily for up to 10 weeks
Cohort 3 (oHCM) - Aficamten & Background DisopyramideEXPERIMENTALParticipants received CK-3773274 doses 5 - 15 mg once daily with dose levels guided by echocardiography assessments for up to 10 weeks while taking disopyramide
Cohort 4 (nHCM) - AficamtenEXPERIMENTALParticipants received CK-3773274 doses of 5 - 15 mg once daily with dose levels guided by echocardiography assessments for up to 10 weeks

Interventions

NameTypeDescription
CK-3773274 (5 - 15 mg)DRUGCK-3773274 tablets administered orally once daily
CK-3773274 (10 - 30 mg)DRUGCK-3773274 tablets administered orally once daily
Placebo for CK-3773274DRUGPlacebo administered orally once daily
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Eligibility Criteria

Age Range18 Years to 85 Years
SexALL
Healthy VolunteersNo
Study Sites22

Inclusion Criteria * Males and females between 18 and 85 years of age at screening. * Body weight is ≥45 kg at screening. * Diagnosed with HCM per the following criteria: * Has left ventricular (LV) hypertrophy with non-dilated LV chamber in the absence of other cardiac disease. * Has minimal ...

Countries:United StatesItalyNetherlandsSpain
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Frequently asked questions about CK-3773274

What is CK-3773274 used for?

CK-3773274 is an investigational small molecule being developed for the treatment of hypertrophic cardiomyopathy (HCM), a condition in which the heart muscle becomes thickened. It is currently in Phase 2 clinical development and has not been approved by regulatory authorities.

Who makes CK-3773274?

CK-3773274 is being developed by Cytokinetics, Incorporated, a biopharmaceutical company traded on the NASDAQ under the ticker symbol CYTK. The company is conducting clinical research to evaluate the drug's safety and efficacy in patients with hypertrophic cardiomyopathy.

What phase is CK-3773274 in?

CK-3773274 is in Phase 2 clinical development. A Phase 2 dose-finding study has been completed, evaluating the drug in adults with hypertrophic cardiomyopathy. The drug is investigational and not yet approved for commercial use.

What clinical trials is CK-3773274 in?

CK-3773274 has one completed clinical trial, registered as NCT04219826. This Phase 2 study was a randomized, double-blind, placebo-controlled dose-finding trial that enrolled 96 adults with hypertrophic cardiomyopathy across the United States, Italy, Netherlands, and Spain.

How does CK-3773274 work?

CK-3773274 is a small molecule designed to target the underlying pathophysiology of hypertrophic cardiomyopathy. While the specific molecular target is not disclosed in available information, the drug is being studied for its effects on cardiac muscle function in patients with this condition.