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Metastatic Solid TumorPhase 1NCT05479812

Dose Escalation and Expansion Study of WTX-124 as Monotherapy and in Combination With Pembrolizumab (Pembro) in Patients With Selected Advanced or Metastatic Solid Tumors

A Phase 1 study testing WTX-124 and pembrolizumab in people with Metastatic Solid Tumor and Advanced Solid Tumor, run by Werewolf Therapeutics, Inc. at 14 sites in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

A first-in-human, Phase I, open-label, multicenter study of WTX-124 administered as monotherapy and in combination with pembrolizumab to patients with advanced or metastatic solid tumors. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Metastatic Solid Tumor, Advanced Solid Tumor
What is being tested?
WTX-124 and pembrolizumab
Could I receive a placebo?
No, everyone receives an active treatment
How many people
156 participants
Where
14 sitesUnited States
Study dates
15 Aug 2022to 22 Apr 2026
Phase
Phase 1
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Each patient must meet all the following criteria to participate in the study:
  • Has histological or cytological documentation of a solid tumor indication for which a CPI (e.g. anti-PD-(L)1 is indicated for all parts of the clinical study;
  • Monotherapy Dose Escalation:
  • Patients with relapsed/refractory locally advanced or metastatic solid tumors for which immunotherapy is approved, who have progressed on or are intolerant to standard therapy, including CPIs, or for whom no standard therapy with proven benefit exists.
  • Combination Dose Escalation:
  • Patients with relapsed/refractory locally advanced or metastatic solid tumors for which immunotherapy is approved, who have progressed on or are intolerant to standard therapy or for whom no standard therapy with proven benefit exists.
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  • Monotherapy Dose Expansion:
  • Arm A: Patients with relapsed advanced or metastatic RCC who have received no more than 4 prior lines of therapy in the advanced or metastatic setting
  • Arm B: Patients with relapsed advanced or metastatic cutaneous malignant melanoma who have received no more than 2 prior lines of therapy for BRAF V600 wild type and no more than 3 prior lines of therapy for BRAF V600 mutant melanoma.
  • Arm C: Patients with relapsed advanced or metastatic cSCC who have received no more than 2 prior lines of systemic therapy
  • Combination Dose Expansion:
  • Arm D: Patients with RCC who have received no more than 3 prior lines of therapy
  • Arm E: Patients with cutaneous melanoma who may be naïve to all prior therapy for advanced or metastatic disease. For BRAF wild type melanoma, patients should have received no more than 2 prior lines of therapy. For BRAF V600 mutant disease, patients should have received no more than 3 prior lines of therapy.
  • Arm F: Patients with PD-L1-positive NSCLC who have received no more than 3 prior lines;
  • ≥18 years of age;
  • Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1;
  • Has at least 1 measurable lesion per RECIST 1.1(lesions situated in a previously irradiated area are considered measurable if progression has been demonstrated in such lesions);
  • Agrees to undergo a pre-treatment and on-treatment biopsy of a primary or metastatic solid tumor lesion;
  • Has adequate organ and bone marrow function;
  • Willingness of men and women of reproductive potential to observe highly effective birth control for the duration of treatment and for 4 months following the last dose of study drug;
  • Additional criteria may apply

Who cannot join

  • Have a history of another active malignancy (a second cancer) within the previous 2 years except for localized cancers that are not related to the current cancer being treated, are considered cured, and, in the opinion of the Investigator, presents a low risk of recurrence. These exceptions include, but are not limited to, basal or squamous cell skin cancer, superficial bladder cancer, or carcinoma in situ of the prostate, cervix, or breast;
  • Has a history of (non-infectious) pneumonitis / interstitial lung disease that required steroids or has current pneumonitis / interstitial lung disease;
  • Have received prior IL-2-directed therapy;
  • Have had an allogeneic tissue/solid organ transplant;
  • Have known symptomatic brain metastases requiring steroids;
  • Have significant cardiovascular disease;
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  • Have an active autoimmune disease that required systemic treatment in the past 2 years;
  • Diagnosis of immunodeficiency, is on immunosuppressive therapy, or is receiving chronic systemic or enteric steroid therapy
  • Major surgery (excluding placement of vascular access) within 2 weeks prior to the first dose of study drug;
  • Investigational agent or anticancer therapy within 5 half-lives or 4 weeks (whichever is shorter) prior to the first dose of study drug;
  • Has received prior radiotherapy within 2 weeks of start of study treatment. A 1-week washout is permitted for palliative radiation (≤2 weeks of radiotherapy) to non-CNS disease;
  • Any unresolved toxicities from prior therapy greater than NCI CTCAE version 5.0 Grade 1 at the time of starting study drug with the exception of alopecia and Grade 2 prior platinum-therapy related neuropathy;
  • Received a live or live-attenuated vaccine within 30 days of the first dose of study drug; Note: Administration of killed vaccines or other formats are allowed.
  • Active, uncontrolled systemic bacterial, viral, or fungal infection;
  • HIV-infected participants with a history of Kaposi sarcoma and/or Multicentric Castleman Disease;
  • Active infection as determined by hepatitis B surface antigen and hepatitis B core antibody, or hepatitis B virus DNA by quantitative polymerase chain reaction (qPCR) testing;
  • Active infection as determined by hepatitis C virus (HCV) antibody or HCV RNA by qPCR testing;
  • Pregnant or lactating;
  • History of hypersensitivity to any of the study drug components;
  • Additional criteria may apply.

Trial locations and contacts

14 sites in 1 country.

14 sites in 1 country

United States14 sites
  • Emory Winship Cancer Institute

    Atlanta, Georgia, 30322

  • Texas Oncology - Austin Midtown

    Austin, Texas, 78705-1165

  • Roswell Park Comprehensive Cancer Care

    Buffalo, New York, 14203

  • Northwestern University

    Chicago, Illinois, 60611

  • University of Texas Southwestern Medical Center

    Dallas, Texas, 75390-8852

  • Hackensack University Medical Center

    Hackensack, New Jersey, 07601

  • Westchester Medical Center

    Hawthorne, New York, 10532

  • NEXT Oncology

    Houston, Texas, 77054

  • Indiana University Melvin and Bren Simon Comprehensive Cancer Center

    Indianapolis, Indiana, 46202

  • Minnesota Oncology Hematology, P.A.

    Maple Grove, Minnesota, 55369

  • Providence Cancer Institute Franz Clinic

    Portland, Oregon, 97213

  • NEXT Oncology

    San Antonio, Texas, 78229

  • HonorHealth

    Scottsdale, Arizona, 85258

  • Moffitt Cancer Center

    Tampa, Florida, 33612

Other trials in United States

About this study

Official title: A Multicenter Phase I/Ib Dose Escalation and Expansion Study of WTX-124 as Monotherapy and in Combination With Pembrolizumab in Patients With Selected Advanced or Metastatic Solid Tumors

A first-in-human, Phase I, open-label, multicenter study of WTX-124 administered as monotherapy and in combination with pembrolizumab to patients with advanced or metastatic solid tumors.

Read the detailed description

This is a first-in-human, Phase I, open-label, multicenter study designed to evaluate the safety, tolerability and preliminary efficacy of WTX-124, a conditionally-activated IL-2 prodrug, when administered as monotherapy and in combination with pembrolizumab, for the treatment of patients with advanced solid tumors. Part 1 of the study is dose escalation of WTX-124, both as monotherapy and in combination with pembrolizumab. Part 2 is dose expansion and is comprised of six arms in which WTX-124 will be administered as monotherapy and in combination with pembrolizumab to patients with advanced or metastatic cutaneous malignant melanoma or advanced or metastatic renal cell carcinoma.

Being tested
WTX-124, pembrolizumab
Keywords
WTX-124, pembrolizumab, Tumors, Cutaneous Malignant Melanoma, mRCC, Renal Carcinoma, IL-2, Cutaneous SCC (cutaneous squamous cell carcinoma), NSCLC (non-small cell lung cancer)
Medical subject headings
Neoplasm Metastasis, Neoplasms, Melanoma, Cutaneous Malignant, Carcinoma, Renal Cell, Carcinoma, Non-Small-Cell Lung

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • WTX-124Drug

    Investigation Product Monotherapy

  • pembrolizumabDrug

    Also called KEYTRUDA®

    Investigation Product in combination with approved therapy

Study groups in NCT05479812
Study groupRoleWhat they receive
WTX-124 monotherapy dose escalationExperimentalWTX-124 monotherapy dose escalation
Receives: Drug: WTX-124
WTX-124 in combination with pembro dose escalationExperimentalWTX-124 in combination with pembrolizumab (pembro) dose escalation
Receives: Drug: WTX-124; Drug: pembrolizumab
Arm A: WTX-124 monotherapy dose expansion. Patients with advanced or metastatic RCC.ExperimentalArm A: WTX-124 monotherapy dose expansion. Patients with advanced or metastatic RCC.
Receives: Drug: WTX-124
Arm B: WTX-124 monotherapy dose expansion. Advanced or metastatic cutaneous malignant melanoma.ExperimentalArm B: WTX-124 monotherapy dose expansion. Patients with advanced or metastatic cutaneous malignant melanoma.
Receives: Drug: WTX-124
Arm C: WTX-124 monotherapy dose expansion. Patients with advanced or metastatic cSCC.ExperimentalArm C: WTX-124 monotherapy dose expansion. Patients with advanced or metastatic cSCC.
Receives: Drug: WTX-124
Arm D: WTX-124 in combination with pembro dose expansion. Advanced or metastatic RCC.ExperimentalArm D: WTX-124 in combination with pembrolizumab dose expansion. Patients with advanced or metastatic RCC.
Receives: Drug: WTX-124; Drug: pembrolizumab
Arm E: WTX-124 with pembro dose expansion. Advanced or metastatic cutaneous melanoma.ExperimentalArm E: WTX-124 in combination with pembrolizumab dose expansion. Patients with advanced or metastatic cutaneous melanoma.
Receives: Drug: WTX-124; Drug: pembrolizumab
Arm F: WTX-124 in combination with pembro dose expansion. Advanced/metastatic PD-L1-positive NSCLExperimentalArm F: WTX-124 in combination with pembrolizumab dose expansion. Patients with advanced or metastatic PD-L1-positive NSCLC lines.
Receives: Drug: WTX-124; Drug: pembrolizumab

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Incidence of Dose Limiting Toxicities (DLTs) in monotherapy and combination therapy

    Measured: 4 weeks

  2. Incidence of treatment emergent adverse events in monotherapy and combination therapy

    Measured: 24 months

  3. Incidence of changes in clinical laboratory abnormalities in monotherapy and combination therapy

    Measured: 24 months

  4. Dose Expansion - Incidence of Dose Limiting Toxicities (DLTs) in monotherapy and combination therapy

    Measured: 4 weeks

  5. Dose Expansion - Incidence of treatment emergent adverse events in monotherapy and combination therapy

    Measured: 24 months

  6. Dose Expansion - Incidence of changes in clinical laboratory abnormalities in monotherapy and combination therapy

    Measured: 24 months

  7. Dose Expansion - Investigator-assessed objective response rate (ORR) per RECIST 1.1 and iORR by iRECIST in monotherapy and combination therapy

    Measured: 24 months

Secondary outcomes (12)
  1. Plasma concentrations of WTX-124 and free IL-2

    Measured: 24 months

  2. Investigator-assessed objective response rate (ORR) per RECIST 1.1 and iORR by iRECIST in monotherapy and combination therapy

    Measured: 24 months

  3. Changes in circulating immune cell populations in response to monotherapy and combination therapy

    Measured: 24 months

  4. Changes in soluble cytokines in response to monotherapy and combination therapy

    Measured: 24 months

  5. Changes in tumor immune profile in response to monotherapy and combination therapy

    Measured: 24 months

  6. Investigator-assessed objective response rate (ORR) per RECIST 1.1 and iORR by iRECIST in monotherapy and combination therapy (in advanced or metastatic renal cell carcinoma and advanced or metastatic cutaneous malignant melanoma)

    Measured: 24 months

  7. Antidrug antibody (ADA) occurrence

    Measured: 24 months

  8. Duration of response

    Measured: 24 months

  9. Progression free survival

    Measured: 24 months

  10. Overall survival

    Measured: 36 months

  11. To investigate immunological biomarkers in peripheral blood and tumor that may correlate with the treatment outcome of WTX-124 as monotherapy or in combination with pembrolizumab

    Measured: 24 months

  12. To assess tumor biopsies for potential biomarkers of target engagement and immune pathway activation

    Measured: 24 months

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted29 Jul 2022
  2. Study start15 Aug 2022
  3. Primary completion22 Apr 2026
  4. Study completion22 Apr 2026

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Treatment
Allocation
Non-randomised
Intervention model
Parallel groups
Masking
None (open label)
Enrolment
156 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05479812
Sponsor's protocol ID
WTX-124x2101
Other IDs
MK-3475-D17, KEYNOTE-D17
Status last verified
May 2025
First submitted
14 Jul 2022
Last updated
9 Oct 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing WTX-124 and pembrolizumab in people with Metastatic Solid Tumor and Advanced Solid Tumor, run by Werewolf Therapeutics, Inc. at 14 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 21 inclusion and 20 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 9 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 14 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Incidence of Dose Limiting Toxicities (DLTs) in monotherapy and combination therapy (time frame: 4 weeks). The study lists 7 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 9 Oct 2026.

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