A Trial Evaluating Safety, Tolerability and Efficacy of CTX340 in Participants With Hypertension

August 6, 2026 updated by: CRISPR Therapeutics AG

A Phase 1/2 Multicenter, First-in-human, Ascending Dose Trial Evaluating the Safety, Tolerability, and Efficacy of a Lipid Nanoparticle Formulation of CRISPR-Guide RNA-Cas9 Nuclease (CTX340) for In Vivo Editing of the Angiotensinogen (AGT) Gene in Participants With Hypertension

A Study of CTX340 in Participants with Uncontrolled Hypertension.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

This is a dose ascending study of CTX340 in participants with hypertension. Subjects will receive CTX340 or placebo via intravenous (IV) infusion.

Study Type

Interventional

Enrollment (Estimated)

69

Phase

  • Phase 2
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • Australia
      • Melbourne, Australia, 3168
        • Recruiting
        • Research Site 2
  • United States
    • Florida
      • Port Orange, Florida, United States, 32127
        • Recruiting
        • Research Site 1

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Key Inclusion Criteria:

  1. Age: ≥18 and ≤75 years.
  2. Body mass index ≤40 kg/m2.
  3. 24-hour mean ambulatory blood pressure monitoring (ABPM) systolic blood pressure (SBP) measurement of ≥130 mm Hg but ≤160 mm Hg despite treatment
  4. Be on treatment with ≥4 antihypertensive therapies at effective doses, of which ≥1 must be a diuretic.
  5. Participants who at any point had childbearing potential must currently be postmenopausal
  6. All participants capable of producing sperm must agree to the use of an acceptable method of effective contraception and their partners with childbearing potential should also agree to use an effective method of contraception.

Exclusion Criteria:

  1. Serum aldosterone and direct renin concentration (or plasma renin activity [PRA]) suggestive of primary aldosteronism
  2. Mean diastolic blood pressure (DBP) ≤65 mm Hg on screening ABPM.
  3. Participants with vascular cause of hypertension which may be amendable to revascularization
  4. Participants with treatable/reversible causes of uncontrolled hypertension
  5. History of renal artery denervation within past 12 months.
  6. Orthostatic hypotension
  7. Complete blood count (CBC) outside the specified ranges per protocol.
  8. Evidence of liver disease
  9. History of a significant coagulation disorder.
  10. Uncontrolled or untreated thyroid disease

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Sequential Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Phase 1: CTX340
Phase 1 is An Open-Label, Ascending Dose Design.
Drug: CTX340
CTX340 is an in vivo gene editing therapy designed to utilize clustered regularly interspaced short palindromic repeats-CRISPR-associated protein 9 (CRISPR-Cas9) to target and disrupt human angiotensinogen (AGT) gene in liver.
Experimental: Phase 2: Recommended Phase 2 Dose CTX340
Phase 2: Recommended Phase 2 Dose CTX340.
Drug: CTX340
CTX340 is an in vivo gene editing therapy designed to utilize clustered regularly interspaced short palindromic repeats-CRISPR-associated protein 9 (CRISPR-Cas9) to target and disrupt human angiotensinogen (AGT) gene in liver.
Experimental: Phase 2: Placebo
Phase 2: Placebo.
Drug: Placebo
One of the arms in Phase 2 will be placebo.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Phase 1: Incidence of dose-limiting toxicities (DLTs)
Time Frame: Up to 12 months
To evaluate the safety and tolerability of a single ascending dose of CTX340 in participants with hypertension to determine the recommended Phase 2 dose (RP2D).
Up to 12 months
Phase 2: Percentage change in circulating angiotensinogen (AGT) concentration from baseline
Time Frame: Through 6 months of follow-up.
To evaluate the pharmacodynamics (PD) effect of CTX340 at the recommended Phase 2 dose (RP2D)
Through 6 months of follow-up.

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
To assess the safety of CTX340
Time Frame: From CTX340 infusion up to 12 months
Incidence of adverse events (AEs), including treatment-emergent adverse events (TEAEs) and adverse events of special interest (AESIs), clinically significant laboratory abnormalities, and clinically significant abnormal vital signs during 12 months of follow-up.
From CTX340 infusion up to 12 months
To assess the effect of CTX340 on systolic blood pressure (SBP) by ambulatory blood pressure monitoring (ABPM)
Time Frame: From CTX340 infusion up to 12 months
Change from baseline in systolic blood pressure (SBP) assessed by 24-hour ambulatory blood pressure monitoring (ABPM)
From CTX340 infusion up to 12 months
To assess the pharmacodynamics (PD) effect of CTX340
Time Frame: Over 12 months, compared to baseline
Percentage change in circulating angiotensinogen (AGT) concentrations over time compared to baseline.
Over 12 months, compared to baseline
To characterize the pharmacokinetics (PK) of CTX340
Time Frame: From CTX340 infusion up to 12 months
Plasma levels of LNP (ionizable lipid and PEG lipid)
From CTX340 infusion up to 12 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

CRISPR Therapeutics AG

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

August 8, 2026

Primary Completion (Estimated)

July 1, 2028

Study Completion (Estimated)

July 1, 2029

Study Registration Dates

First Submitted

August 6, 2026

First Submitted That Met QC Criteria

August 6, 2026

First Posted (Actual)

August 11, 2026

Study Record Updates

Last Update Posted (Actual)

August 11, 2026

Last Update Submitted That Met QC Criteria

August 6, 2026

Last Verified

August 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • CRSP-CVD-402

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

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Subscribe