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

27. dubna 2026 aktualizováno: 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.

Přehled studie

Postavení

Zatím nenabíráme

Detailní popis

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 studie

Intervenční

Zápis (Odhadovaný)

48

Fáze

  • Fáze 2

Kontakty a umístění

Tato část poskytuje kontaktní údaje pro ty, kteří studii provádějí, a informace o tom, kde se tato studie provádí.

Studijní kontakt

Kritéria účasti

Výzkumníci hledají lidi, kteří odpovídají určitému popisu, kterému se říká kritéria způsobilosti. Některé příklady těchto kritérií jsou celkový zdravotní stav osoby nebo předchozí léčba.

Kritéria způsobilosti

Věk způsobilý ke studiu

  • Dospělý
  • Starší dospělý

Přijímá zdravé dobrovolníky

Ne

Popis

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

Studijní plán

Tato část poskytuje podrobnosti o studijním plánu, včetně toho, jak je studie navržena a co studie měří.

Jak je studie koncipována?

Detaily designu

  • Primární účel: Léčba
  • Přidělení: N/A
  • Intervenční model: Přiřazení jedné skupiny
  • Maskování: Žádné (otevřený štítek)

Zbraně a zásahy

Skupina účastníků / Arm
Intervence / Léčba
Experimentální: 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 je měření studie?

Primární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Major Pathologic Response (MPR) Rate
Časové okno: 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)

Sekundární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Incidence of Adverse Events (AEs), Serious Adverse Events (SAEs), Immune-Related AEs (irAEs), and Dose-Limiting Toxicities (DLTs)
Časové okno: 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
Časové okno: 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
Časové okno: 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)
Časové okno: 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)
Časové okno: 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
Časové okno: 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
Časové okno: 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
Časové okno: 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
Časové okno: 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)

Spolupracovníci a vyšetřovatelé

Zde najdete lidi a organizace zapojené do této studie.

Termíny studijních záznamů

Tato data sledují průběh záznamů studie a předkládání souhrnných výsledků na ClinicalTrials.gov. Záznamy ze studií a hlášené výsledky jsou před zveřejněním na veřejné webové stránce přezkoumány Národní lékařskou knihovnou (NLM), aby se ujistily, že splňují specifické standardy kontroly kvality.

Hlavní termíny studia

Začátek studia (Odhadovaný)

1. května 2026

Primární dokončení (Odhadovaný)

1. prosince 2027

Dokončení studie (Odhadovaný)

1. června 2029

Termíny zápisu do studia

První předloženo

20. dubna 2026

První předloženo, které splnilo kritéria kontroly kvality

27. dubna 2026

První zveřejněno (Aktuální)

4. května 2026

Aktualizace studijních záznamů

Poslední zveřejněná aktualizace (Aktuální)

4. května 2026

Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality

27. dubna 2026

Naposledy ověřeno

1. dubna 2026

Více informací

Termíny související s touto studií

Plán pro data jednotlivých účastníků (IPD)

Plánujete sdílet data jednotlivých účastníků (IPD)?

NE

Popis plánu 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.

Informace o lécích a zařízeních, studijní dokumenty

Studuje lékový produkt regulovaný americkým FDA

Ne

Studuje produkt zařízení regulovaný americkým úřadem FDA

Ne

Tyto informace byly beze změn načteny přímo z webu clinicaltrials.gov. Máte-li jakékoli požadavky na změnu, odstranění nebo aktualizaci podrobností studie, kontaktujte prosím register@clinicaltrials.gov. Jakmile bude změna implementována na clinicaltrials.gov, bude automaticky aktualizována i na našem webu .

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