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Harmony-HHT: ATV-1601 in Participants With Hereditary Hemorrhagic Telangiectasia (HHT)

28 oktober 2026 uppdaterad av: Atavistik Bio, Inc

A Randomized, Placebo-Controlled, Double-Blind, Proof-of-Concept Study of ATV-1601 in Participants With Hereditary Hemorrhagic Telangiectasia (HHT)

This is a 2-part study evaluating ATV-1601 in participants with moderate to severe HHT. Part 1 is a randomized, double-blind, placebo-controlled study evaluating 3 dosing regimens of ATV-1601. Patients completing Part 1 may participate in the Part 2 open-label extension to receive ATV-1601.

Studieöversikt

Detaljerad beskrivning

Part 1: This is a Phase 1/2 proof-of-concept, double-blind, multicenter, placebo-controlled study to evaluate the safety, pharmacokinetics and efficacy of 3 oral dosing regimens of ATV-1601. Participants who meet eligibility requirements will be randomized in a double-blind manner to one of 3 doses of ATV-1601 or placebo. Participants will receive double-blind study treatment for a 16-week period.

Part 2: Eligible participants who complete Part 1 may enroll in an open-label extension study to receive up to 2 years of additional treatment. All participants in the open-label extension will receive ATV-1601. Once the recommended Phase 2 dose (RP2D) is determined based on Part 1, all participants in Part 2 will have the option to switch to the RP2D.

Studietyp

Interventionell

Inskrivning (Beräknad)

100

Fas

  • Fas 2
  • Fas 1

Kontakter och platser

Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.

Studieorter

    • Arizona
      • Phoenix, Arizona, Förenta staterna, 85013
    • Georgia
      • Augusta, Georgia, Förenta staterna, 30912
    • Indiana
      • Indianapolis, Indiana, Förenta staterna, 46260
    • Massachusetts
      • Boston, Massachusetts, Förenta staterna, 02114
    • Minnesota
      • Rochester, Minnesota, Förenta staterna, 55905
    • Missouri
      • St Louis, Missouri, Förenta staterna, 63110
    • North Carolina
      • Chapel Hill, North Carolina, Förenta staterna, 27599
    • Utah
      • Salt Lake City, Utah, Förenta staterna, 84132
        • Rekrytering
        • University of Utah Health Sciences Center
        • Kontakt:

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

18 år och äldre (Vuxen, Äldre vuxen)

Tar emot friska volontärer

Ja

Kön som är behöriga för studier

Allt

Beskrivning

Inclusion Criteria:

  • Ability to provide informed consent prior to any study-specific procedures
  • Confirmed diagnosis of hereditary hemorrhagic telangiectasia (HHT) based on Curaçao criteria
  • Moderate to severe HHT with an ESS ≥ 4
  • Anemia at Screening and/or requirement for at least 1 red-cell unit (RUE) in the previous 6 months
  • Adequate hematologic, renal, and hepatic function per protocol-defined laboratory criteria
  • Use highly effective contraception during the study and for a protocol-defined period after last dose

Exclusion Criteria:

  • Clinically significant abnormalities of glucose metabolism including diagnosed Type 1 or uncontrolled Type 2 diabetes
  • Chronic cardiac disease, or cardiac rhythm abnormalities
  • History of significant cardiovascular, hepatic, renal, or hematologic disease not related to HHT that may confound study results
  • Use of prohibited concomitant medications within a protocol-defined washout period prior to first dose (including strong CYP modulators and certain herbal supplements)
  • Recent (within 6 weeks) major surgery or local ablative procedures, or procedures on nasal telangiectasias
  • Prior AKT inhibitor
  • Pregnant or breastfeeding women

Additional Criteria for Open-Label Extension:

  • Participants must complete the double-blind treatment period (Part 1)

Studieplan

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

  • Primärt syfte: Behandling
  • Tilldelning: Randomiserad
  • Interventionsmodell: Parallellt uppdrag
  • Maskning: Fyrdubbla

Vapen och interventioner

Deltagargrupp / Arm
Intervention / Behandling
Experimentell: Part 1: 60 mg QD

Active drug, once daily

Administered orally, daily

Andra namn:
  • Active drug, capsule
Experimentell: Part 1: 100 mg QD

Active drug, once daily

Administered orally, daily

Andra namn:
  • Active drug, capsule
Experimentell: Part 1: 60 BID

Active drug, twice daily

Administered orally, daily

Andra namn:
  • Active drug, capsule
Experimentell: Part 1: Placebo

Control Arm

Administered orally, daily

Andra namn:
  • Inactive, Placebo

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Part 1: Safety and tolerability
Tidsram: 16 weeks

Number and severity of treatment-emergent adverse events (TEAEs) and study drug-related TEAEs

16 weeks
Part 2: Safety and tolerability
Tidsram: 24 months

Type, incidence, severity, timing, seriousness and relatedness of AEs and laboratory abnormalities

24 months

Sekundära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Part 1: Change in Epistaxis duration
Tidsram: 16 weeks

28-day total duration compared to baseline

16 weeks
Part 1: Epistaxis frequency
Tidsram: 16 weeks

28-day frequency of nosebleeds compared to baseline

16 weeks
Part 1: Epistaxis intensity
Tidsram: 16 weeks

28-day average epistaxis intensity (6-point scale) of nosebleeds compared to baseline

16 weeks
Part 1: Intensity-weighted epistaxis duration
Tidsram: 16 weeks

28-day intensity-weighted duration of nosebleeds

16 weeks
Part 1: Epistaxis Severity Score (ESS)
Tidsram: 16 weeks

The Epistaxis Severity Score (ESS) is a validated 6-question instrument with scores ranging from 0 to 10, where higher scores indicate more severe epistaxis symptoms.

16 weeks
Part 1: Change in Hemoglobin
Tidsram: 16 weeks

Hemoglobin levels compared to baseline

16 weeks
Part 1: Change in Parenteral iron use
Tidsram: 16 weeks

Amount of parenteral iron administered compared to 16-weeks prior to treatment initiation

16 weeks
Part 1: Change in Blood transfusion requirements
Tidsram: 16 Weeks

Amount of packed red blood cell (PRBC) transfusions and rate of transfusion independence compared to 16-weeks prior to treatment initiation

16 Weeks
Part 1: Pharmacokinetics - Maximum observed concentration (Cmax)
Tidsram: 16 Weeks

Maximum plasma concentration

16 Weeks
Part 1: Pharmacokinetics - Area under the concentration-time curve over the dosing interval (AUCtau)
Tidsram: 16 Weeks

Systemic exposure of ATV-1601 over the dosing interval

16 Weeks
Part 1: Pharmacokinetics - Area under the concentration-time curve extrapolated to infinity (AUCinf)
Tidsram: 16 Weeks

Total systemic exposure of ATV-1601 extrapolated to infinite time

16 Weeks
Part 1: Pharmacokinetics - Time to maximum concentration (Tmax)
Tidsram: 16 Weeks

Time to reach maximum plasma concentration

16 Weeks
Part 1: Pharmacokinetics - minimum concentration (Cmin)
Tidsram: 16 Weeks

Pre-dose trough plasma concentration

16 Weeks
Part 1: Pharmacokinetics - Half-life (t½)
Tidsram: 16 Weeks

Time required for plasma concentration to decrease by half

16 Weeks
Part 2: Epistaxis duration
Tidsram: Up to 2 years

28-day total duration every 4 weeks

Up to 2 years
Part 2: Epistaxis frequency
Tidsram: Up to 2 years

Total number of nosebleeds every 4 weeks

Up to 2 years
Part 2: Epistaxis Severity Score (ESS)
Tidsram: At 12 weeks and every 12 weeks thereafter up to study completion

Severity of nosebleeds using a score of 0-10 automatically calculated based on responses to 6 questions.

At 12 weeks and every 12 weeks thereafter up to study completion
Part 2: Change in Hemoglobin
Tidsram: Monthly during Part 2

Hemoglobin levels compared to baseline

Monthly during Part 2
Part 2: Parenteral iron use
Tidsram: At 12 weeks and every 12 weeks thereafter up to study completion

Total amount of parenteral iron infused (mg) compared to baseline (12 weeks prior to treatment initiation

At 12 weeks and every 12 weeks thereafter up to study completion
Part 2: Blood transfusion requirements
Tidsram: At 12 weeks and every 12 weeks thereafter during part 2

Total number of packed red blood cell (PRBC) transfusions (units) compared to baseline

At 12 weeks and every 12 weeks thereafter during part 2
Part 2: Transfusion independence
Tidsram: At 12 weeks and every 12 weeks thereafter during part 2

Proportion of participants who do not require PRBC transfusions

At 12 weeks and every 12 weeks thereafter during part 2

Samarbetspartners och utredare

Det är här du hittar personer och organisationer som är involverade i denna studie.

Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart (Faktisk)

27 juli 2026

Primärt slutförande (Beräknad)

1 december 2027

Avslutad studie (Beräknad)

1 mars 2030

Studieregistreringsdatum

Först inskickad

12 maj 2026

Först inskickad som uppfyllde QC-kriterierna

15 maj 2026

Första postat (Faktisk)

22 maj 2026

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

29 oktober 2026

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

28 oktober 2026

Senast verifierad

1 augusti 2026

Mer information

Denna information hämtades direkt från webbplatsen clinicaltrials.gov utan några ändringar. Om du har några önskemål om att ändra, ta bort eller uppdatera dina studieuppgifter, vänligen kontakta register@clinicaltrials.gov. Så snart en ändring har implementerats på clinicaltrials.gov, kommer denna att uppdateras automatiskt även på vår webbplats .

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