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The Efficacy and Safety of PRTX007-003 Combined With Pembrolizumab in Resectable Stage III Melanoma (INFLECTION-003)

27 kwietnia 2026 zaktualizowane przez: Primmune Therapeutics, Inc.

A Phase 2 Study to Investigate the Activity of Neoadjuvant PRTX007 Combined With Pembrolizumab in Participants With Stage III Melanoma (INFLECTION-003)

This Phase 2, multi-center, single-arm study evaluates the safety, tolerability, and activity of neoadjuvant PRTX007 in combination with pembrolizumab in participants with resectable Stage III melanoma. Neoadjuvant immunotherapy has demonstrated improved clinical outcomes compared with adjuvant-only approaches, but there remains a need to enhance pathologic response rates without significant added toxicity.

Participants will receive oral PRTX007, a Toll-like receptor 7 (TLR7) agonist prodrug, administered in combination with intravenous pembrolizumab prior to surgical resection. The primary objective is to determine the major pathologic response (MPR) rate following neoadjuvant therapy. Secondary objectives include evaluation of safety, pathologic complete response, event-free survival, overall survival, pharmacokinetics, and immune-related biomarkers.

This study aims to determine whether the addition of PRTX007 to pembrolizumab improves antitumor immune responses and clinical outcomes in patients with Stage III melanoma.

Przegląd badań

Status

Jeszcze nie rekrutacja

Szczegółowy opis

This study investigates whether combining the TLR7 agonist PRTX007 with pembrolizumab enhances immune-mediated tumor response in the neoadjuvant setting for Stage III melanoma, with the goal of improving pathologic response rates and clinical outcomes while maintaining an acceptable safety profile.

Design This is a Phase 2, multi-center, open-label, single-arm study conducted in Australia. The study will enroll approximately 48 participants with resectable Stage III melanoma.

The study consists of two parts:

  • Part A: 24 participants will be enrolled, including an initial dose-escalation safety run-in using a 3+3 design to evaluate tolerability and dose-limiting toxicities.
  • Part B: An additional 24 participants will be enrolled if sufficient activity is observed in Part A.

Treatment Plan

Participants will receive neoadjuvant therapy consisting of:

  • PRTX007: Oral administration for 3 days on and 4 days off per week for 9 cycles (7-day cycles)
  • Pembrolizumab: 200 mg intravenous infusion every 3 weeks for 3 cycles Following completion of neoadjuvant therapy, participants will undergo definitive surgical resection.

Post-surgical treatment will be response-adapted:

  • Participants achieving MPR may receive observation or pembrolizumab alone
  • Participants without MPR will receive adjuvant PRTX007 in combination with pembrolizumab

Typ studiów

Interwencyjne

Zapisy (Szacowany)

48

Faza

  • Faza 2

Kontakty i lokalizacje

Ta sekcja zawiera dane kontaktowe osób prowadzących badanie oraz informacje o tym, gdzie badanie jest przeprowadzane.

Kontakt w sprawie studiów

Kryteria uczestnictwa

Badacze szukają osób, które pasują do określonego opisu, zwanego kryteriami kwalifikacyjnymi. Niektóre przykłady tych kryteriów to ogólny stan zdrowia danej osoby lub wcześniejsze leczenie.

Kryteria kwalifikacji

Wiek uprawniający do nauki

  • Dorosły
  • Starszy dorosły

Akceptuje zdrowych ochotników

Nie

Opis

Inclusion Criteria:

  • Adults aged 18 years or older
  • Histologically confirmed, resectable Stage III cutaneous melanoma.
  • Candidate for curative-intent surgical resection
  • Eastern Cooperative Oncology Group (ECOG) performance status of 0-2
  • Adequate organ function
  • Able to provide written informed consent

Exclusion Criteria:

  • Prior systemic therapy for melanoma, including immunotherapy
  • Uveal melanoma or mucosal melanoma.
  • Active autoimmune disease requiring systemic treatment
  • Primary immunodeficiency or use of systemic immunosuppressive therapy
  • Women who are pregnant or breastfeeding
  • Recent treatment with another investigational therapy
  • Any condition that, in the opinion of the investigator, would interfere with study participation or safety

Plan studiów

Ta sekcja zawiera szczegółowe informacje na temat planu badania, w tym sposób zaprojektowania badania i jego pomiary.

Jak projektuje się badanie?

Szczegóły projektu

  • Główny cel: Leczenie
  • Przydział: Nie dotyczy
  • Model interwencyjny: Zadanie dla jednej grupy
  • Maskowanie: Brak (otwarta etykieta)

Broń i interwencje

Grupa uczestników / Arm
Interwencja / Leczenie
Eksperymentalny: Neoadjuvant PRTX007 + Pembrolizumab (Response-Adapted Adjuvant Therapy)
Participants with resectable Stage III melanoma will receive neoadjuvant treatment with PRTX007 in combination with pembrolizumab prior to definitive surgical resection. Following surgery, participants will receive response-adapted adjuvant therapy based on pathologic response. Participants achieving a major pathologic response (MPR) may receive observation or pembrolizumab alone, while participants without MPR will receive adjuvant PRTX007 in combination with pembrolizumab.

PRTX007 is an orally administered prodrug of PRX034, a Toll-like receptor 7 (TLR7) agonist designed to activate innate and adaptive immune responses.

NEOADJUVANT REGIMEN

  • 600 mg orally once daily (safety run-in participants) or
  • 750 mg orally once daily (subsequent participants)
  • Administered 3 days on, 4 days off (7-day cycle)
  • Total of 9 cycles (9 weeks)

ADJUVANT REGIMEN (IF NO MPR)

  • 750 mg orally once daily
  • Administered 3 days on, 4 days off
  • Total of 12 cycles (12 weeks)

Pembrolizumab is a programmed cell death protein-1 (PD-1) blocking antibody administered by intravenous infusion

NEOADJUVANT REGIMEN

  • 200 mg IV every 3 weeks (Q3W)
  • Total of 3 cycles (9 weeks)

ADJUVANT REGIMEN

  • 400 mg IV every 6 weeks (Q6W) for 7 cycles OR
  • 200 mg IV every 3 weeks (Q3W) for 14 cycles
  • Total duration: approximately 42 weeks

Co mierzy badanie?

Podstawowe miary wyniku

Miara wyniku
Opis środka
Ramy czasowe
Major Pathologic Response (MPR) Rate
Ramy czasowe: At time of surgical resection (approximately 9 weeks after initiation of treatment)
Major pathologic response (MPR) is defined as ≤10% residual viable tumor cells in the resected tumor specimen following completion of neoadjuvant therapy, as assessed by central pathology review.
At time of surgical resection (approximately 9 weeks after initiation of treatment)

Miary wyników drugorzędnych

Miara wyniku
Opis środka
Ramy czasowe
Incidence of Adverse Events (AEs), Serious Adverse Events (SAEs), Immune-Related AEs (irAEs), and Dose-Limiting Toxicities (DLTs)
Ramy czasowe: From first dose of study treatment through end of study (approximately up to 52 weeks)
Number and severity of adverse events, serious adverse events, immune-related adverse events, and dose-limiting toxicities, graded according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version 6.0.
From first dose of study treatment through end of study (approximately up to 52 weeks)
Number of participants with abnormal physical examination findings, abnormal vital signs, abnormal Eastern Cooperative Oncology Group (ECOG) performance status, and abnormal clinical laboratory parameters
Ramy czasowe: Baseline through end of study (approximately up to 52 weeks)
Baseline through end of study (approximately up to 52 weeks)
Pathologic Complete Response (pCR) Rate
Ramy czasowe: At time of surgical resection (approximately 9 weeks after initiation of treatment)
Pathologic complete response (pCR) is defined as the absence of residual viable tumor cells (0%) in the resected tumor specimen following neoadjuvant therapy, as assessed by central pathology review.
At time of surgical resection (approximately 9 weeks after initiation of treatment)
Event-Free Survival (EFS)
Ramy czasowe: From first dose up to 1 year
Event-free survival (EFS) is defined as the time from first dose of study treatment to any of the following events: disease progression or toxicity preventing surgery during neoadjuvant treatment; recurrence of disease after surgery; failure to achieve complete resection (R0 or R1); or death from any cause.
From first dose up to 1 year
Overall Survival (OS)
Ramy czasowe: From first dose through end of study (approximately up to 52 weeks or longer if followed)
Overall survival is defined as the time from first dose of study treatment to death from any cause.
From first dose through end of study (approximately up to 52 weeks or longer if followed)
Pharmacokinetics of PRTX007
Ramy czasowe: During treatment period (multiple time points from baseline through approximately 9 weeks and selected later time points)
Plasma concentrations of PRTX007 and its active metabolite will be measured to characterize pharmacokinetic parameters using validated analytical methods.
During treatment period (multiple time points from baseline through approximately 9 weeks and selected later time points)
Changes in cytokine, chemokine and soluble PD-1/PD-L1 biomarkers
Ramy czasowe: Baseline through treatment period (up to approximately 9 weeks and selected later time points)
Baseline through treatment period (up to approximately 9 weeks and selected later time points)
Changes in mRNA expression
Ramy czasowe: Baseline through treatment period (up to approximately 9 weeks and selected later time points)
Baseline through treatment period (up to approximately 9 weeks and selected later time points)
Changes in immune cell activation and proliferation markers
Ramy czasowe: Baseline through treatment period (up to approximately 9 weeks and selected later time points)
Baseline through treatment period (up to approximately 9 weeks and selected later time points)

Współpracownicy i badacze

Tutaj znajdziesz osoby i organizacje zaangażowane w to badanie.

Daty zapisu na studia

Daty te śledzą postęp w przesyłaniu rekordów badań i podsumowań wyników do ClinicalTrials.gov. Zapisy badań i zgłoszone wyniki są przeglądane przez National Library of Medicine (NLM), aby upewnić się, że spełniają określone standardy kontroli jakości, zanim zostaną opublikowane na publicznej stronie internetowej.

Główne daty studiów

Rozpoczęcie studiów (Szacowany)

1 maja 2026

Zakończenie podstawowe (Szacowany)

1 grudnia 2027

Ukończenie studiów (Szacowany)

1 czerwca 2029

Daty rejestracji na studia

Pierwszy przesłany

20 kwietnia 2026

Pierwszy przesłany, który spełnia kryteria kontroli jakości

27 kwietnia 2026

Pierwszy wysłany (Rzeczywisty)

4 maja 2026

Aktualizacje rekordów badań

Ostatnia wysłana aktualizacja (Rzeczywisty)

4 maja 2026

Ostatnia przesłana aktualizacja, która spełniała kryteria kontroli jakości

27 kwietnia 2026

Ostatnia weryfikacja

1 kwietnia 2026

Więcej informacji

Terminy związane z tym badaniem

Plan dla danych uczestnika indywidualnego (IPD)

Planujesz udostępniać dane poszczególnych uczestników (IPD)?

NIE

Opis planu IPD

Individual participant data will not be shared because the study involves an investigational product and the sponsor has not established a data sharing plan at this time.

Informacje o lekach i urządzeniach, dokumenty badawcze

Bada produkt leczniczy regulowany przez amerykańską FDA

Nie

Bada produkt urządzenia regulowany przez amerykańską FDA

Nie

Te informacje zostały pobrane bezpośrednio ze strony internetowej clinicaltrials.gov bez żadnych zmian. Jeśli chcesz zmienić, usunąć lub zaktualizować dane swojego badania, skontaktuj się z register@clinicaltrials.gov. Gdy tylko zmiana zostanie wprowadzona na stronie clinicaltrials.gov, zostanie ona automatycznie zaktualizowana również na naszej stronie internetowej .

Badania kliniczne na Czerniak Stopień III

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