IC14 (Atibuclimab) in Arrhythmogenic Cardiomyopathy

Phase 1b Study of IC14 in Arrhythmogenic Cardiomyopathy

The goal of this clinical trial is to test IC14 (atibuclimab) in patients with arrhythmogenic cardiomyopathy (ACM) and who have an implantable cardoverter/defibrillator in place. ACM is also called arrhythmogenic right ventricular dysplasia (ARV) or arrhythmogenic right ventricular cardiomyopathy (ARVC). The main questions the study aims to answer are the effect of treatment on blood markers of inflammation, safety, and pharmacokinetics. There will also be measurements of myocardial imaging of C-C chemokine receptor type 2 (CCR2+) immune cells (optional), monitoring of cardiac arrhythmias using the patient's pre-existing intracardiac cardioverter/defibrillator (ICD) and a Holter monitor, electrocardiogram (ECG), echocardiogram (ECHO), and blood tests. Results will be compared to baseline; there is no inactive placebo treatment group.

Participants will be asked to undergo screening and baseline testing, then receive 4 intravenous infusions with blood measurements before and after the infusion (including 24, 48, and 72 hours and 7, 14, and 28 days). Participants will be offered specialized scanning of the heart muscle, and will be asked to provide recordings from their ICD, undergo Holter monitoring twice, and have electrocardiograms (ECG), echocardiograms (ECHO) and blood tests.

Study Overview

• Status: Completed
• Conditions: Arrhythmogenic Right Ventricular Dysplasia; Arrhythmogenic Right Ventricular Cardiomyopathy 1; Arrhythmogenic Left Ventricular Cardiomyopathy; Arrhythmogenic Cardiomyopathy; ACM; ARVC; PKP2
• Intervention / Treatment: Biological: IC14

Detailed Description

This proof-of-concept study will evaluate the safety, pharmacokinetics, and preliminary efficacy of IC14 administered via IV infusion in patients with ACM.

In preclinical studies, anti-CD14 treatment prevented the development of ventricular dysfunction and cardiac damage in a mouse model of arrhythmogenic cardiomyopathy.

The objective of this study is to determine whether IC14 treatment reduces markers of inflammation and disease biomarkers in ACM patients treated with IC14. Secondary objectives are to further characterize the effect of IC14 treatment on CCR2+ cell myocardial infiltration measured by myocardial positron emission tomography (PET)/CT imaging, ventricular premature contractions (VPCs), other arrhythmias, ICD discharges, NYHA functional classification, and quality of life.

To characterize safety of IC14, the following assessments are to be performed: clinical biochemistry (safety analyses), ECG, ECHO, adverse events (AEs), serious adverse events (SAEs), and formation of anti-drug antibodies.

Finally, pharmacokinetic/pharmacodynamic parameters will be conducted. These include blood test measurements levels of the drug and its binding to its target in the serum and on cells.

This study will assign 5 patients to intravenous (IV) administration of IC14 (atibulcimab) at 20 mg/kg. The study drug will be administered every three weeks via IV infusion, for a total of 4 infusions (12 weeks of treatment).

• Study Type: Interventional
• Enrollment (Actual): 1
• Phase: Phase 2; Phase 1

Contacts and Locations

Study Locations

• United States
  • Missouri
    • St Louis, Missouri, United States, 63110
      • Washington University School of Medicine
  • Ohio
    • Cleveland, Ohio, United States, 44195
      • Cleveland Clinic

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

Patients are eligible for the study if all of the following criteria are met:

1. Age ≥ 18 years
2. Diagnosis of arrhythmogenic cardiomyopathy and: 1) meeting the 2020 Modified Task Force Criteria as affected;
3. Left ventricular ejection fraction of ≥30%
4. Functioning implantable cardioverter/defibrillator with remote interrogation capability
5. One of the following: 1) a history of ventricular tachycardia or ventricular fibrillation (VF); 2) ≥500 ventricular premature contractions (VPCs) in 24 hours on the most recent 24-hour Holter monitor recording; or 3) C-reactive protein >=1.5 mg/mL
6. Agreement by subject, physician, and cardiologist to not change concomitant ACM medications or to conduct catheter ablation during study participation unless needed for management of life-threatening conditions
7. Capable and willing to provide informed consent
8. Capable of completing study visits

9. Females participating in the study must meet one of the following criteria:

   1. Surgically sterilized (e.g., hysterectomy, bilateral oophorectomy, or tubal ligation) for at least 6 months or postmenopausal (postmenopausal females must have no menstrual bleeding for at least 1 year) or
   2. If not postmenopausal, agree to use a double method of contraception, one of which is a barrier method (e.g., intrauterine device plus condom, spermicidal gel plus condom) until 30 days after the IC14 treatment and have negative human chorionic gonadotropin (β-hCG) test for pregnancy at Screening
10. Males who have not had a vasectomy must use appropriate contraception methods (barrier or abstinence) until 30 days after IC14 treatment

Exclusion Criteria:

A patient fulfilling any of the following criteria is to be excluded from enrollment in the study:

1. Prior myocardial infarction
2. Receiving continuous infusion of antiarrhythmic medication at time of enrollment
3. Previous major vascular intervention within 4 weeks
4. NYHA heart failure class IV, except palpitations
5. Major surgery within 6 weeks
6. Patient has participated in any study using an investigational drug or device within 30 days
7. Life expectancy of less than 1 year due to non-cardiac pathology
8. History of allergic reaction to atibuclimab (IC14) or any monoclonal antibody drug product or other CD14-derived drug product or any component used in the study (including contrast media)
9. Known severe renal (creatinine clearance <30 mL/min/m2) or hepatic insufficiency as well as alanine transaminase (ALT)/aspartate transaminase (AST) elevations ≥ 3x upper limit normal (ULN); isolated AST elevation is not considered an exclusion criterion from study participation
10. Current or planned use of continuous high-dose corticosteroids (short courses of corticosteroids are allowable)
11. Chronic immunosuppression with disease-modifying anti-rheumatic drugs (DMARDS)
12. Any clinically significant abnormality identified at the time of Screening that in the judgment of the Investigator or any sub-Investigator would preclude safe completion of the study
13. Patients who will be inaccessible due to geographic or social factors during treatment or follow-up

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: IC14 (atibuclimab); IC14 (atibuclimab) 20 mg/kg intravenously every 3 weeks for 12 weeks (4 doses)	Biological: IC14; recombinant monoclonal antibody directed against cluster of differentiation 14 (CD14) antigen; Other Names: (atibuclimab)

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Safety: Treatment-emergent adverse events and serious adverse events	Treatment-emergent adverse events and serious adverse events	Baseline through 14 weeks
Safety: Incidence of anti-drug antibodies	Incidence of anti-drug antibodies	Baseline, 4 weeks, and 14 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Inflammatory biomarker C-reactive protein	Change in concentration from baseline at 12 weeks	Baseline, 12 weeks
CCR2+ Myocardial Imaging (optional)	Mean change in CCR2+ cell myocardial infiltration measured by CCR2+ PET/CT imaging (standardized uptake value)	Baseline compared to 12 weeks
Ventricular tachycardia	Number of ventricular tachycardia runs in a 7-day Holter monitor	Baseline compared to 12 weeks
Ventricular premature contractions	Frequency of ventricular premature contractions in a 7-day Holter monitor	Baseline compared to 12 weeks
Sustained and non-sustained ventricular tachycardia	Number of episodes of sustained and non-sustained ventricular tachycardia documented by ICD	Baseline through 12 weeks
Treated ventricular tachycardia	Number of episodes of treated ventricular tachycardia (pacemaker and/or defibrillation) by ICD	Baseline through 12 weeks
Atrial premature contractions	Number of atrial premature contractions in a 7-day Holter monitor	Baseline compared to 12 weeks
New York Heart Association (NYHA) Functional Class	Change in NYHA Functional Class Questionnaire	Baseline compared to 12 weeks
Implantable cardioverter/defibrillator (ICD) discharges	Frequency of ICD discharges (appropriate and/or inappropriate)	Baseline through 12 weeks
Quality-of-Life Score determined by the Kansas City Cardiomyopathy Questionnaire	Change in Quality-of-Life Score determined by the Kansas City Cardiomyopathy Questionnaire, range 0 (very poor) to 65 (excellent)	Baseline compared to 12 weeks
Disease biomarker Troponin I	Change in concentration from baseline at 12 weeks	Baseline, 12 weeks
Disease biomarker N-terminal B-type natriuretic peptide (NT-pro-BNP)	Change in concentration from baseline at 12 weeks	Baseline, 12 weeks
Inflammatory biomarker interleukin (IL)1-beta	Change in concentration from baseline at 12 weeks	Baseline, 12 weeks
Pharmacokinetics: Serum IC14 concentration versus time curve	Area under the serum concentration versus time curve (AUC)	Baseline through 14 weeks
Pharmacokinetics: Peak serum IC14 concentration	Peak serum IC14 concentration	Baseline through 14 weeks
Pharmacokinetics: Half life	Half-life of serum IC14 concentration	Baseline through 14 weeks
Pharmacodynamics: Receptor Occupancy	Measurement of monocyte membrane CD14 receptor occupancy	Baseline through 14 weeks
Pharmacodynamics: Effective Concentration 95%	Estimation of serum concentration of IC14 to achieve 95% monocyte membrane receptor occupancy	Baseline through 14 weeks

Collaborators and Investigators

• Sponsor: Implicit Bioscience
• Investigators: Study Director: Jan Agosti, MD, Implicit Bioscience

Study record dates

Study Major Dates

• Study Start (Actual): March 29, 2024
• Primary Completion (Actual): August 15, 2025
• Study Completion (Actual): April 15, 2026

Study Registration Dates

• First Submitted: February 6, 2024
• First Submitted That Met QC Criteria: February 16, 2024
• First Posted (Actual): February 23, 2024

Study Record Updates

• Last Update Posted (Actual): April 22, 2026
• Last Update Submitted That Met QC Criteria: April 17, 2026
• Last Verified: April 1, 2026

More Information

Terms related to this study

• Keywords: arrhythmia; cardiac genetic disorder; desmoglein mutation
• Additional Relevant MeSH Terms: Cardiovascular Diseases; Pathologic Processes; Heart Diseases; Cardiomyopathies; Congenital Abnormalities; Cardiovascular Abnormalities; Heart Defects, Congenital; Congenital, Hereditary, and Neonatal Diseases and Abnormalities; Pathological Conditions, Signs and Symptoms; Arrhythmias, Cardiac; Arrhythmogenic Right Ventricular Dysplasia; Arrhythmogenic Right Ventricular Dysplasia, Familial, 1; atibuclimab
• Other Study ID Numbers: ACM01

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No