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Pulmonary Arterial HypertensionPhase 2NCT05764265

Extension Study of Efficacy and Safety of LTP001 in Pulmonary Arterial Hypertension Participants

A Phase 2 study testing LTP001 in people with Pulmonary Arterial Hypertension, run by Novartis Pharmaceuticals at 12 sites in 7 countries.

Terminated

Stopped early. The study ended before it was planned to and will not resume.

Official record
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Trial summary

The purpose of this study was to measure the long-term safety and efficacy profile of LTP001 in participants with pulmonary arterial hypertension (PAH). The study offered participants who had completed the CLTP001A12201 double-blind parent study in PAH an opportunity to receive LTP001 (whether they were on LTP001 or… Read more about this study

Who is it for?
Ages 18 to 75 years
Conditions the study is for
Pulmonary Arterial Hypertension
What is being tested?
LTP001
Type of treatment
Pill or oral medicine
Could I receive a placebo?
No, everyone receives an active treatment
How many people
31 participants
Where
12 sitesin 7 countries
Study dates
27 Mar 2023to 14 May 2024
Phase
Phase 2
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 75 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Written informed consent must have been obtained before any assessment was performed.
  • Participant was currently completing the Novartis-sponsored study CLTP001A12201 in PAH and completed key efficacy and safety procedures up to the end of treatment of the core study, without meeting discontinuation criteria in the core study.
  • Willingness and ability to comply with scheduled visits, treatment plans and any other study procedures.
  • In the opinion of the Investigator would benefit from LTP001 treatment.

Who cannot join

  • History of hypersensitivity to the study treatment.
  • Sexually active males not committing to condom use precautions: sexually active males must have used a condom during intercourse while taking drug and for 24 hours after stopping study medication and should not father a child in this period nor donate sperm. A condom was required to be used also by vasectomized men in order to prevent delivery of the drug via seminal fluid.
  • Required or planned transplant or heart/lung surgery.
  • Women of child-bearing potential, defined as all women physiologically capable of becoming pregnant, unless they were using highly effective methods of contraception while taking study treatment and until EOT visit (2 weeks post-last treatment). Highly effective contraception methods included:
  • Total abstinence (when this was in line with the preferred and usual lifestyle of the participant. Periodic abstinence (e.g. calendar, ovulation, symptothermal, post-ovulation methods) and withdrawal were not acceptable methods of contraception.
  • Female sterilization (had surgical bilateral oophorectomy with or without hysterectomy), total hysterectomy, or bilateral tubal ligation at least six weeks before taking study treatment. In case of oophorectomy alone, only when the reproductive status of the woman had been confirmed by follow up hormone level assessment.
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  • Male sterilization (at least 6 months prior to screening). For female participants on the study, the vasectomized male partner should have been the sole partner for that participant
  • Use of oral, estrogen and progesterone, injected, or implanted hormonal methods of contraception or placement of an intrauterine device (IUD) or intrauterine system (IUS), or other forms of hormonal contraception that have comparable efficacy (failure rate < 1%), for example hormone vaginal ring or transdermal hormone contraception.
  • In case of use of oral contraception women should have been stable on the same pill for a minimum of 3 months before taking study treatment.
  • Women were considered post-menopausal if they had 12 months of natural (spontaneous) amenorrhea with an appropriate clinical profile (e.g. age appropriate history of vasomotor symptoms). Women were considered not of child-bearing potential if they were post-menopausal or had surgical bilateral oophorectomy (with or without hysterectomy) or total hysterectomy at least six weeks prior. In the case of oophorectomy alone, only when the reproductive status of the woman had been confirmed by follow up hormone level assessment was she considered not of child bearing potential.
  • Pregnant or nursing (lactating) women, where pregnancy was defined as the state of a female after conception and until the termination of gestation, confirmed by a positive hCG laboratory test.
  • Acute or chronic impairment (other than dyspnea), which would limit the ability to comply with study requirements, including interference with physical activity or execution of study procedures such as 6MWT (e.g., angina pectoris, claudication, musculoskeletal disorder, need for walking aids).
  • Permanent discontinuation of Novartis drug in the core efficacy study due to toxicity or disease progression despite active treatment, non-compliance to study procedures, withdrawal of consent or any other reason.

Trial locations and contacts

12 sites in 7 countries.

12 sites in 7 countries

Poland3 sites
  • Novartis Investigative Site

    Krakow, 31 202

  • Novartis Investigative Site

    Lodz, 91-347

  • Novartis Investigative Site

    Wroclaw, 50-556

Other trials in Poland

Spain3 sites
  • Novartis Investigative Site

    Barcelona, 08036

  • Novartis Investigative Site

    Madrid, 28041

  • Novartis Investigative Site

    Málaga, 29010

Other trials in Spain

Germany2 sites
  • Novartis Investigative Site

    Dresden, Saxony, 01307

  • Novartis Investigative Site

    Heidelberg, 69120

Other trials in Germany

United States1 site
  • Pulmonary Associates PA

    Mesa, Arizona, 85206

Other trials in United States

Argentina1 site
  • Novartis Investigative Site

    Caba, Buenos Aires, C1025ABI

Other trials in Argentina

Netherlands1 site
  • Novartis Investigative Site

    Amsterdam, North Holland, 1081 HV

Other trials in Netherlands

United Kingdom1 site
  • Novartis Investigative Site

    Sheffield, South Yorkshire, S10 2JF

Other trials in United Kingdom

About this study

Official title: An Open-label Extension Study to Investigate Efficacy, Safety and Tolerability of LTP001 in Participants With Pulmonary Arterial Hypertension

The purpose of this study was to measure the long-term safety and efficacy profile of LTP001 in participants with pulmonary arterial hypertension (PAH). The study offered participants who had completed the CLTP001A12201 double-blind parent study in PAH an opportunity to receive LTP001 (whether they were on LTP001 or not). Unblinding of the treatment received in CLTP001A12201 was generally not needed but could occur on request by the investigator.

Read the detailed description

This was a non-randomized, open-label extension study of LTP001 for participants with PAH who completed the parent Study CLTP001A12201. Eligible participants were presented with the opportunity to enroll in the extension study at the end of treatment visit of the parent study. Participants in the extension study were planned to receive a once-daily dose of LTP001 for 52 weeks regardless of their parent study treatment (i.e. LTP001 or placebo). The study duration was planned up to 54 weeks with a treatment duration up to 52 weeks and maximum 2-week transition period from the CLTP001A12201 study. The visit frequency was planned to include visits at Weeks 1, 5, 13, 26, 39, 52, and 54 along with optional visits at the discretion of the Investigators at Weeks 9 and 17.

Due to the study termination, no patient reached Week 52. After the termination announcement, following the instruction to immediately stop treatment for all participants, an end-of-treatment (EOT) visit was conducted. Sites were advised to complete protocol-required assessments based on investigator judgement and patient willingness to undergo procedures, with a primary focus on ensuring a safe exit from the study. Most sites performed only a few safety assessments, and only a minimal number of patients completed an echocardiogram.

Being tested
LTP001
Keywords
Pulmonary Hypertension
Medical subject headings
Pulmonary Arterial Hypertension, Hypertension, Pulmonary

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • LTP001Drug

    LTP001, 6 mg, was administered orally once daily in the morning

Study groups in NCT05764265
Study groupRoleWhat they receive
LTP001ExperimentalParticipants received LTP001, 6 mg, orally once daily in the morning for approximately 39 weeks
Receives: Drug: LTP001

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)

    Incidence and severity of adverse events (AEs) by treatment group, including changes in the vital signs, electrocardiogram and laboratory results qualifying and reported as AEs. Due to the study termination, no patient reached Week 52. At the end of treatment visit, final safety assessments were performed.

    Measured: Up to approximately 45 weeks

Secondary outcomes (15)
  1. Change From Baseline in Average Cardiac Output (CO) at Week 26

    Right heart catheterization (RHC) assessment was performed to assess several hemodynamic variables in pulmonary hypertension, including CO.

    Measured: Baseline, Week 26

  2. Change From Baseline in Mean Pulmonary Artery (PA) Pressure at Week 26

    Right heart catheterization (RHC) assessment was performed to assess several hemodynamic variables in pulmonary hypertension, including PA pressure.

    Measured: Baseline, Week 26

  3. Change From Baseline in Pulmonary Capillary Wedge Pressure (PCWP) at Week 26

    Right heart catheterization (RHC) assessment was performed to assess several hemodynamic variables in pulmonary hypertension, including pulmonary capillary wedge pressure (PCWP).

    Measured: Baseline, Week 26

  4. Change From Baseline in Right Heart Catheterization Pulmonary Vascular Resistance (PVR) at Week 26

    PVR was defined as the resistance against blood flow from the pulmonary artery to the left atrium measured in dynes.sec.cm-5.

    Measured: Baseline, Week 26

  5. Change From Baseline in Right Atrium (RA) Pressures at Week 26

    The Right Heart Catheterization (RHC) assessment was performed to assess several hemodynamic variables in pulmonary hypertension, including RA pressures.

    Measured: Baseline, Week 26

  6. Change From Baseline in Systemic Vascular Resistance (SVR) at Week 26

    The Right Heart Catheterization (RHC) assessment was performed to assess several hemodynamic variables in pulmonary hypertension, including SVR.

    Measured: Baseline, Week 26

  7. Change From Baseline in Six Minute Walk Distance (6MWD)

    6MWD test measures the distance that a participant can walk on a flat, hard surface in a period of 6 minutes. Due to the study termination, no patient reached Week 52. At the end of treatment (EOT) visit, final safety assessments were performed based on investigator judgement and patient willingness to undergo procedures.

    Measured: Baseline, Week 26, up to 39 weeks (EOT)

  8. Change From Baseline in Tricuspid Annular Plane Systolic Excursion (TAPSE)

    Key right ventricular (RV) function endpoints such as tricuspid annular plane systolic excursion (TAPSE) were assessed with echocardiography. Due to the study termination, no patient reached Week 52. At the end of treatment (EOT) visit, final safety assessments were performed based on investigator judgement and patient willingness to undergo procedures. Only a minimal number of patients completed an echocardiogram (Echo).

    Measured: Baseline, Week 26, up to 39 weeks (EOT)

  9. Change From Baseline in Tricuspid Annular Plane Systolic Velocity (TASV)

    Key right ventricular (RV) function endpoints such as tricuspid annular systolic velocity (TASV) were assessed with echocardiography. Due to the study termination, no patient reached Week 52. At the end of treatment (EOT) visit, final safety assessments were performed based on investigator judgement and patient willingness to undergo procedures. Only a minimal number of patients completed an echocardiogram (Echo).

    Measured: Baseline, Week 26, up to 39 weeks (EOT)

  10. Change From Baseline in Peak Velocity of Excursion (RV S')

    Key right ventricular (RV) function per echocardiography. The terms Tricuspid Annular Systolic Velocity (TASV) and Peak Velocity of Excursion (RV S') are synonymous in echocardiography to describe the peak systolic velocity of the lateral tricuspid annulus. Including both TASV and RV S' as separate secondary endpoints was an oversight in the protocol as the data, calculation, and analyses for both (TASV and RV S') are identical. Therefore, the TASV and RV S' data in this results disclosure are the same. Due to the study termination, no patient reached Week 52. At the end of treatment (EOT) visit, final safety assessments were performed based on investigator judgement and patient willingness to undergo procedures. Only a minimal number of patients completed an echocardiogram (Echo).

    Measured: Baseline, Week 26, up to 39 weeks (EOT)

  11. Change From Baseline in Fractional Area Change (FAC)

    Key right ventricular (RV) function endpoints such as RV fractional area change (RV FAC) were assessed with echocardiography. Due to the study termination, no patient reached Week 52. At the end of treatment (EOT) visit, final safety assessments were performed based on investigator judgement and patient willingness to undergo procedures. Only a minimal number of patients completed an echocardiogram (Echo).

    Measured: Baseline, Week 26, up to 39 weeks (EOT)

  12. Change From Baseline in Quality of Life Measured by the emPHasis-10 Questionnaire

    emPHasis-10 is a questionnaire with 10 questions designed to determine how pulmonary hypertension affects a participant's life. Each item is scored on a scale of 0 to 5, with a total score ranging from 0 to 50. A higher score indicates worse quality of life. Due to the study termination, no patient reached Week 52. At the end of treatment (EOT) visit, final safety assessments were performed based on investigator judgement and patient willingness to undergo procedures.

    Measured: Baseline up to 39 weeks (EOT)

  13. Change From Baseline in Quality of Life Measured by the PAH-SYMPACT Questionnaire

    PAH-SYMPACT is a questionnaire used to assess pulmonary arterial hypertension symptoms and their impact. Individual item scores range from 0 to 4. Total score is calculated as the sum of the scores for the individual items divided by the number of items. A higher score indicates more severe symptoms/impacts. Due to the study termination, no patient reached Week 52. At the end of treatment (EOT) visit, final safety assessments were performed based on investigator judgement and patient willingness to undergo procedures.

    Measured: Baseline up to 39 weeks (EOT)

  14. Time to Clinical Worsening

    Time to any of the following:

    • Death
    • Hospital stay greater than 24 hours due to worsening of pulmonary arterial hypertension
    • Worsening of PAH resulting in need for lung transplantation or balloon atrial septostomy
    • Initiation of parenteral prostanoid therapy, initiation of oxygen therapy, initiation of any other pulmonary arterial hypertension-specific therapies or need for increase of diuretics for more than 4 weeks due to worsening of pulmonary arterial hypertension
    • Significant drop in six-minute walk distance Due to the study termination, no patient reached Week 52. At the end of treatment (EOT) visit, final safety assessments were performed based on investigator judgement and patient willingness to undergo procedures.

    Measured: Baseline up to 39 weeks (EOT)

  15. Change From Baseline in N-terminal Fragment of the Prohormone B-type Natriuretic Peptide (NT-ProBNP)

    NT-proBNP is a blood biomarker to assess right ventricular distress. Due to the study termination, no patient reached Week 52. At the end of treatment (EOT) visit, final safety assessments were performed based on investigator judgement and patient willingness to undergo procedures.

    Measured: Baseline up to 39 weeks (EOT)

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted10 Mar 2023
  2. Study start27 Mar 2023
  3. Primary completion26 Apr 2024
  4. Study completion14 May 2024

Why it stopped: Sponsor Decision

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
31 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05764265
Sponsor's protocol ID
CLTP001A12201E1
Other IDs
2022-002007-38
Status last verified
Jan 2026
First submitted
10 Jan 2023
Last updated
27 Jan 2026
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
Yes: Novartis is committed to sharing with qualified external researchers, access to patient-level data and supporting clinical documents from eligible studies. These requests are reviewed and approved by an independent review panel on the basis of scientific merit. All data provided is anonymized to respect the privacy of patients who have participated in the trial in line with applicable laws and regulations. This trial data availability is according to the criteria and process described on www.clinicalstudydatarequest.com

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing LTP001 in people with Pulmonary Arterial Hypertension, run by Novartis Pharmaceuticals at 12 sites in 7 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 4 inclusion and 13 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: stopped early, as of the sponsor's last update on 27 Jan 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 12 sites in Poland, Spain, Germany, United States, Argentina and 2 more countries. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 26 Dec 2025). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs) (time frame: Up to approximately 45 weeks). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 27 Jan 2026.

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