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WTX-124

Phase 1

Metastatic Solid Tumor | Small molecule | Oncology |Werewolf Therapeutics, Inc.|Trials Updated: Oct 9, 2026

WTX-124 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Jul 2022

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDBiomarker
Total Trials1
Total Enrollment156

FDA Designations

No designations recorded

WTX-124 clinical trials

WTX-124 · 1 trial · 2 indications

Phase 1 1
NCT05479812Dose Escalation and Expansion Study of WTX-124 as Monotherapy and in Combination With Pembrolizumab (Pembro) in Patients With Selected Advanced or Metastatic Solid TumorsMetastatic Solid Tumor
COMPLETED156 Analytics
PHASE1COMPLETED
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
Metastatic Solid TumorUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence of Dose Limiting Toxicities (DLTs) in monotherapy and combination therapy
4 weeks
Incidence of treatment emergent adverse events in monotherapy and combination therapy
24 months
Incidence of changes in clinical laboratory abnormalities in monotherapy and combination therapy
24 months
Dose Expansion - Incidence of Dose Limiting Toxicities (DLTs) in monotherapy and combination therapy
4 weeks
Dose Expansion - Incidence of treatment emergent adverse events in monotherapy and combination therapy
24 months
Dose Expansion - Incidence of changes in clinical laboratory abnormalities in monotherapy and combination therapy
24 months
Dose Expansion - Investigator-assessed objective response rate (ORR) per RECIST 1.1 and iORR by iRECIST in monotherapy and combination therapy
24 months

Secondary Endpoints

Plasma concentrations of WTX-124 and free IL-2
24 months
Investigator-assessed objective response rate (ORR) per RECIST 1.1 and iORR by iRECIST in monotherapy and combination therapy
24 months
Changes in circulating immune cell populations in response to monotherapy and combination therapy
24 months
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
WTX-124 monotherapy dose escalationEXPERIMENTALWTX-124 monotherapy dose escalation
WTX-124 in combination with pembro dose escalationEXPERIMENTALWTX-124 in combination with pembrolizumab (pembro) dose escalation
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.
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.
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.
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.
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.
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.

Interventions

NameTypeDescription
WTX-124DRUGInvestigation Product Monotherapy
pembrolizumabDRUGInvestigation Product in combination with approved therapy
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites14

Inclusion Criteria: Each patient must meet all the following criteria to participate in the study: 1. 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; 2. Monotherapy Dose Escalation: P...

Countries:United States
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Competitive Landscape -Other Solid Tumors 10 trials (matched to "Metastatic Solid Tumor")

Recent Changes (Last 90 Days)

MEDIUMSep 27, 2026NCT05479812TRIAL_REMOVED: changed
MEDIUMSep 27, 2026NCT05479812TRIAL_REMOVED: changed
MEDIUMSep 27, 2026NCT05479812TRIAL_REMOVED: changed
HIGHAug 27, 2026NCT05479812Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHAug 27, 2026NCT05479812Status: ACTIVE_NOT_RECRUITING → COMPLETED

Frequently asked questions about WTX-124

What is WTX-124 used for?

WTX-124 is an investigational therapy being studied in adults with selected advanced or metastatic solid tumors. It is a biomarker-selected oncology candidate, meaning trial enrollment is guided by specific tumor biomarkers. It is not approved for any indication and remains in clinical development.

Who is developing WTX-124?

WTX-124 is being developed by Werewolf Therapeutics, Inc., which trades under the ticker HOWL. The company is the sponsor of the clinical program evaluating the candidate in advanced or metastatic solid tumors.

What phase is WTX-124 in?

WTX-124 is in Phase 1 clinical development. Its single registered study, NCT05479812, was a Phase 1 dose escalation and expansion trial that has been completed. The drug is investigational and has not received FDA approval.

What clinical trials is WTX-124 in?

WTX-124 has been evaluated in one registered clinical trial, NCT05479812, titled a dose escalation and expansion study of WTX-124 as monotherapy and in combination with pembrolizumab in patients with selected advanced or metastatic solid tumors. The Phase 1 study enrolled 156 participants across sites in the United States and is completed.

Is WTX-124 FDA approved?

No. WTX-124 is an investigational drug in Phase 1 clinical development and has not been approved by the FDA for any indication. Its only registered trial, NCT05479812, has been completed, and no approval has been granted.

How was the WTX-124 trial designed?

NCT05479812 was a Phase 1 dose escalation and expansion study of WTX-124 given as monotherapy and in combination with pembrolizumab in patients with selected advanced or metastatic solid tumors. It was a controlled, non-randomized, open-label trial that enrolled 156 adults aged 18 and older in the United States.