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A Phase 1/1b Study of PRT13722 in Participants With Advanced HR+/HER2- Breast Cancer

5. november 2026 opdateret af: Prelude Therapeutics Incorporated

A Phase 1/1b, First-in-Human, Open-Label, Multicenter Study to Evaluate the Safety, Tolerability, Pharmacokinetics, Pharmacodynamics, and Antitumor Activity of PRT13722, a KAT6A Protein Degrader, as Monotherapy and in Combination With Endocrine and Targeted Therapy in Adults With Locally Advanced or Metastatic HR-Positive, HER2-Negative Breast Cancer

This first-in-human, open-label, multicenter study will evaluate the safety, tolerability, pharmacokinetics, pharmacodynamics, and preliminary antitumor activity of PRT13722, an oral KAT6A protein degrader, in adults with locally advanced or metastatic Hormone receptor-positive, human epidermal growth factor receptor 2-negative (HR+/HER2-) breast cancer. PRT13722 will be evaluated as monotherapy and in combination with fulvestrant, abemaciclib plus fulvestrant, or imlunestrant to determine recommended dose(s) for expansion (RDE) and evaluate preliminary clinical activity.

Studieoversigt

Status

Rekruttering

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

This is a first-in-human, open-label, multicenter, dose-escalation and dose-expansion study of PRT13722, a selective oral KAT6A protein degrader, in adults with locally advanced or metastatic HR-positive, HER2-negative breast cancer. The study will evaluate the safety, tolerability, dose-limiting toxicities, pharmacokinetics, pharmacodynamics, and preliminary antitumor activity of PRT13722 administered as monotherapy and in combination with fulvestrant, abemaciclib plus fulvestrant, or imlunestrant to determine recommended dose(s) for expansion and evaluate preliminary clinical activity.

The study is conducted in three parts:

Part 1: Monotherapy dose escalation and backfill cohorts. Part 2: Combination dose-escalation cohorts with fulvestrant, abemaciclib plus fulvestrant, and imlunestrant.

Part 3: Combination dose-expansion cohorts to further evaluate safety and preliminary efficacy at the selected dose levels.

Up to approximately 240 participants are planned for enrollment across the three parts of the study.

Undersøgelsestype

Interventionel

Tilmelding (Anslået)

242

Fase

  • Fase 1

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiekontakt

Studiesteder

    • Ohio
      • Maumee, Ohio, Forenede Stater, 43537
        • Rekruttering
        • Taylor Cancer Research Center

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • Willing and able to comply with all scheduled visits, treatment plan, laboratory tests, lifestyle considerations (including contraception requirements), and other study procedures.
  • histological or cytological diagnosis of locally advanced or metastatic HR-positive/HER2-negative breast cancer
  • Disease progression following prior standard therapy and eligible for the assigned study cohort
  • Measurable or evaluable disease per RECIST v1.1
  • Willingness to provide tumor tissue for biomarker analyses
  • Eastern Cooperative Oncology Group performance status of 0-1
  • Negative serum or urine pregnancy test and agree to use highly effective contraception or maintain true abstinence.
  • Adequate organ function and bone marrow reserves (hematology, renal, and hepatic)

Exclusion Criteria:

  • Untreated, symptomatic, or unstable brain metastases
  • Symptomatic visceral disease at risk of imminent life-threatening complications
  • Uncontrolled infection or significant concurrent medical conditions
  • Clinically significant cardiovascular disease or prolonged QT syndrome
  • Pregnancy or breastfeeding
  • Prior treatment with a KAT6-targeting agent
  • Recent anticancer therapy, radiotherapy, or major surgery
  • Use of prohibited concomitant medications, including strong CYP3A4 inhibitors or inducers, proton pump inhibitors, P-gp inhibitors or inducers, and breast cancer resistance protein inhibitors
  • Participation in another interventional clinical study
  • Any condition that would interfere with study participation or evaluation of study results

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Ikke-randomiseret
  • Interventionel model: Sekventiel tildeling
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: PRT13722 Monotherapy

Participants receive PRT13722 once daily as monotherapy. This arm includes dose-escalation (Part 1A) and backfill cohorts (Part 1B) evaluating PRT13722 in participants with locally advanced or metastatic HR-positive, HER2-negative breast cancer to support the selection of RDE.

PRT13722 is an investigational oral drug administered once daily at the assigned dose level.

Eksperimentel: PRT13722 + Fulvestrant

Participants receive PRT13722 once daily in combination with fulvestrant. This study includes a dose-escalation (Part 2A) in participants with locally advanced or metastatic HR-positive, HER2-negative breast cancer followed by dose-expansion (Part 3A) at the RDE.

PRT13722 is an investigational oral drug administered once daily at the assigned dose level.

Fulvestrant is an approved selective estrogen receptor degrader (SERD) administered on Cycle 1 Day 1, Cycle 1 Day 15, Cycle 2 Day 1, then once monthly as an intramuscular injection into the buttocks (gluteal muscle).

Eksperimentel: PRT13722 + Abemaciclib + Fulvestrant

Participants receive PRT13722 once daily in combination with abemaciclib and fulvestrant. This study includes a dose-escalation (Part 2B) in participants with locally advanced or metastatic HR-positive, HER2-negative breast cancer followed by dose-expansion (Part 3B) at the RDE.

PRT13722 is an investigational oral drug administered once daily at the assigned dose level.

Fulvestrant is an approved selective estrogen receptor degrader (SERD) administered on Cycle 1 Day 1, Cycle 1 Day 15, Cycle 2 Day 1, then once monthly as an intramuscular injection into the buttocks (gluteal muscle).

Abemaciclib is an approved oral cyclin-dependent kinase 4 and 6 (CDK4/6) inhibitor administered twice daily and used in combination with endocrine therapy for HR-positive, HER2-negative breast cancer.

Eksperimentel: PRT13722 + Imlunestrant

Participants receive PRT13722 once daily in combination with imlunestrant. This study includes a dose-escalation (Part 2C) in participants with locally advanced or metastatic HR-positive, HER2-negative breast cancer followed by dose-expansion (Part 3C) at the RDE.

PRT13722 is an investigational oral drug administered once daily at the assigned dose level.

Imlunestrant is an approved oral SERD administered once daily.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Dose limiting toxicity of PRT13722 (Parts 1A and 2)
Tidsramme: Through cycle 1 (28 days)

Incidence of dose limiting toxicities, defined according to protocol-specified criteria

Through cycle 1 (28 days)
Incidence of Treatment-Emergent Adverse Events [Safety and Tolerability] of PRT13722 as monotherapy and in combination (Parts 1A and 2)
Tidsramme: Through study completion, an average of 2 years

Safety and tolerability assessed by the number of participants with treatment-emergent adverse events, serious adverse events, adverse events leading to dose modification, treatment interruption, or treatment discontinuation, and clinically significant laboratory abnormalities. Adverse events and selected laboratory abnormalities will be graded according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE), Version 6.0

Through study completion, an average of 2 years
Preliminary Antitumor Activity: Objective Response Rate (Parts 1B and 3)
Tidsramme: Through study completion, an average of 2 years

Proportion of patients with best overall response of either complete response or partial response, as assessed by the investigator per RECIST v1.1

Through study completion, an average of 2 years

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Preliminary Antitumor Activity: Objective Response Rate (Parts 1A and 2)
Tidsramme: Through study completion, an average of 2 years

Proportion of patients with best overall response of either complete response or partial response, as assessed by the investigator per RECIST v1.1

Through study completion, an average of 2 years
Duration of Response
Tidsramme: Through study completion, an average of 2 years

Time from first documented response to disease progression as assessed by the investigator per RECIST v1.1, or death, whichever comes first.

Through study completion, an average of 2 years
Clinical Benefit Response
Tidsramme: Through study completion, an average of 2 years

Proportion of patients with a best overall response of complete response, partial response, or durable stable disease (24 weeks or longer), as assessed by the investigator per RECIST v1.1

Through study completion, an average of 2 years
Progression-Free Survival
Tidsramme: Through study completion, an average of 2 years

Time from the date of first dose of investigational product to the date of first documented disease progression, as assessed by the investigator per RECIST v1.1, or death due to any cause

Through study completion, an average of 2 years
Overall Survival
Tidsramme: Through study completion, an average of 2 years

Time from the date of first dose of investigational product to death due to any cause

Through study completion, an average of 2 years
Incidence of Treatment-Emergent Adverse Events [Safety and tolerability] of PRT13722 as Monotherapy and in Combination (Parts 1B and 3)
Tidsramme: Through study completion, an average of 2 years

Safety and tolerability will be evaluated by incidence of adverse events leading to dose modifications, treatment interruptions, treatment discontinuations, and clinically significant laboratory abnormalities graded according to NCI CTCAE, Version 6.0

Through study completion, an average of 2 years
Maximum Observed Plasma Concentration (Cmax)
Tidsramme: Cycle 1 Day 1, Cycle 1 Day 15, and Cycle 2 Day 1 (each cycle is 28 days)

Maximum observed plasma concentration will be calculated using non-compartmental analysis

Cycle 1 Day 1, Cycle 1 Day 15, and Cycle 2 Day 1 (each cycle is 28 days)
Time To Maximum Concentration (Tmax)
Tidsramme: Cycle 1 Day 1, Cycle 1 Day 15, and Cycle 2 Day 1 (each cycle is 28 days)

Time to maximum concentration will be calculated using non-compartmental analysis

Cycle 1 Day 1, Cycle 1 Day 15, and Cycle 2 Day 1 (each cycle is 28 days)
Terminal Elimination Half-life (T1/2)
Tidsramme: Cycle 1 Day 1 (each cycle is 28 days)

Terminal elimination half-life will be calculated using non-compartmental analysis

Cycle 1 Day 1 (each cycle is 28 days)
Area under the plasma concentration versus time curve (AUC)
Tidsramme: Cycle 1 Day 1, Cycle 1 Day 15, and Cycle 2 Day 1 (each cycle is 28 days)

Area under the plasma concentration-time curve will be calculated using non-compartmental analysis

Cycle 1 Day 1, Cycle 1 Day 15, and Cycle 2 Day 1 (each cycle is 28 days)
Steady State Trough Concentrations
Tidsramme: Cycle 1 Day 15, and Cycle 2 Day 1 (each cycle is 28 days)

Steady state trough concentrations will be calculated using non-compartmental analysis

Cycle 1 Day 15, and Cycle 2 Day 1 (each cycle is 28 days)

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Anslået)

16. november 2026

Primær færdiggørelse (Anslået)

31. oktober 2028

Studieafslutning (Anslået)

31. oktober 2029

Datoer for studieregistrering

Først indsendt

15. oktober 2026

Først indsendt, der opfyldte QC-kriterier

23. oktober 2026

Først opslået (Faktiske)

29. oktober 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

9. november 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

5. november 2026

Sidst verificeret

1. oktober 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • PRT13722-01
  • 2026-527825-37-00 (Ctis)

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

Studerer et amerikansk FDA-reguleret lægemiddelprodukt

Ja

Studerer et amerikansk FDA-reguleret enhedsprodukt

Ingen

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