Clinical trial · Interventional
The Efficacy and Safety of PRTX007-003 Combined With Pembrolizumab in Resectable Stage III Melanoma
A Phase 2 Study to Investigate the Activity of Neoadjuvant PRTX007 Combined With Pembrolizumab in Participants With Stage III Melanoma (INFLECTION-003)
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 8, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260908-000001
Summary
Brief summary (as posted)
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.
Conditions
Conditions (1)
Free-text conditions as registered, with the CancerIndex entity they were reconciled to and the match type.
| Condition (as posted) | Mapped entity | Match | Confidence |
|---|---|---|---|
| Melanoma Stage III | Melanoma | CURATED_BROADER | 0.78 |
Interventions
Interventions (2)
| Intervention | Type | Mapped drug | Match |
|---|---|---|---|
| Pembrolizumab | Drug | Pembrolizumab | ALIAS |
| PRTX007 | Drug | — | UNRESOLVED |
Design
Arms and outcomes
Arms (1)
- type
- EXPERIMENTAL
- label
- Neoadjuvant PRTX007 + Pembrolizumab (Response-Adapted Adjuvant Therapy)
- description
- 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.
- interventionNames
- Drug: PRTX007
- Drug: Pembrolizumab
Primary outcomes (1)
- measure
- Major Pathologic Response (MPR) Rate
- timeFrame
- At time of surgical resection (approximately 9 weeks after initiation of treatment)
- description
- 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.
Secondary outcomes (9)
Eligibility
Eligibility (as posted)
- Sex
- All
- Minimum age
- 18 Years
Show eligibility criteria text
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
References
Publications (0)
Data not yet available