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TBio-4101

Phase 1

Metastatic Melanoma | Monoclonal antibody | Oncology |Turnstone Biologics Corp.|Last Updated: Apr 2, 2026

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment17

FDA Designations

No designations recorded

Clinical trial landscape

TBio-4101 · 2 trials · 12 indications

Phase 1 2
NCT05628883Proof of Concept of TBio-4101, Lymphodepleting Chemo, IL-2 for Relapsed/Refractory MelanomaMetastatic Melanoma
COMPLETED17 Analytics
NCT06236425TBio-4101 and Pembro wi/ or w/o Chemo in Recurrent/Metastatic HNSCCSquamous Cell Carcinoma of Head and Neck
ACTIVE NOT_RECRUITING7 Analytics
PHASE1COMPLETED
Proof of Concept of TBio-4101, Lymphodepleting Chemo, IL-2 for Relapsed/Refractory Melanoma
Metastatic MelanomaUnlock trial analytics
PHASE1ACTIVE NOT_RECRUITING
TBio-4101 and Pembro wi/ or w/o Chemo in Recurrent/Metastatic HNSCC
Squamous Cell Carcinoma of Head and NeckUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of Participants that Successfully Receive TBio-4101
Day 7

Percentage of participants who undergo tumor resection that successfully receive TBio-4101

Safety and tolerability
Up to 2 years

The incidence of treatment-emergent adverse events will be tabulated using NCI CTCAE v5.0

Secondary Endpoints

Objective Response Rate (OOR)
2 years after receiving TIL Transfer
6 Month Overall Survival (OS)
at 6 Months
12 Month Overall Survival (OS)
at 12 Months
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Infusion of TBio-4101 TILEXPERIMENTALTBio-4101 is a tumor-infiltrating lymphocyte (TIL) product: participants tumor tissue is surgically removed and immune T-cells are taken out of the tumor and multiplied, or grown, in the laboratory. TIL product infused intravenously over 20 to 30 minutes within 2 to 4 days after the last dose of fludarabine Participants will also receive: * Cyclophosphamide dose 60 mg/kg/day for 2 days administered IV in 250 mL dextrose 5% in water infused simultaneously with Mesna 15 mg/kg/day delivered over 1 hour per day for 2 days. Fludarabine 25 mg/m2/day is delivered by intravenous piggyback daily over 15-30 minutes for 5 days. * Interleukin-2 (IL-2)- will be given to participants through IV after they receive the infusion of the TIL. IL-2 is administered at a dose of 600,000 IU/kg (based on actual body weight) IV every 8-12 hours beginning within 24 hours of TIL infusion for a maximum of 6 doses.
TIL Harvest/Standard of care Treatment PhaseOTHERParticipants will undergo tumor harvest for TIL and then receive 2 to 3 cycles of pembrolizumab or pembrolizumab/platinum chemotherapy (cisplatin or carboplatin / 5-FU) as per standard of care.
TBio-4101 TreatmentEXPERIMENTALParticipants without radiographic response (progressive disease) after pembrolizumab or pembrolizumab/platinum chemotherapy, and who meet eligibility requirements, will transition to receive TBio-4101. Participants will receive TBio-4101 infusion and after completion of TBio-4101 infusion, IL-2 will be administered every 8 hours, for up to 6 doses. Finally, pembrolizumab will be administered on Day 14, Day 35, and Day 56 and Q6W (beginning Week 12) thereafter for up to 2 years until discontinuation.

Interventions

NameTypeDescription
TBio-4101BIOLOGICALTBio-4101 is a tumor-infiltrating lymphocyte (TIL) product that involves the use of special immune cells called T-cells. A T-cell is a type of lymphocyte, or white blood cell.
CyclophosphamideDRUGParticipants will receive Cyclophosphamide 60 mg/kg/day intravenously (IV) in 250 mL over approximately 1 hour per day for 2 days.
FludarabineDRUGParticipants will receive an intravenously (IV) infusion of Fludarabine 25 mg/m2 for approximately 15 to 30 minutes for 5 days, prior to T-Cell infusion
Interleukin-2DRUGParticipants will receive Interleukin-2 (IL-2) 600 000 IU/kg intravenously every 8 to 12 hours beginning within 24 hours after T-cell infusion.
PembrolizumabDRUGWill be administered as per standard of care. Participants with initial partial or complete radiographic response will continue on the same therapy at the discretion of the treating physician.
Platinum based chemotherapyDRUGWill be administered as per standard of care. Participants with initial partial or complete radiographic response will continue on the same therapy at the discretion of the treating physician.
AldesleukinDRUGAfter completion of TBio-4101 infusion, Aldesleukin will be administered every 8 hours, for up to 6 doses.
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites1

Inclusion Criteria: * Participants must have histologically confirmed, unresectable or metastatic melanoma as follows: * Cutaneous, non-acral, melanoma (including melanoma of unknown primary) * Cutaneous acral melanoma * Mucosal melanoma * Ocular melanoma (including uveal, iris, conjunctiv...

Countries:United States
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Frequently asked questions about TBio-4101

What is TBio-4101 used for?

TBio-4101 is an investigational monoclonal antibody being studied for the treatment of squamous cell carcinoma of the head and neck and metastatic melanoma. It is currently in Phase 1 clinical trials for these oncology indications.

How does TBio-4101 work?

TBio-4101 is a monoclonal antibody, a type of targeted therapy designed to interact with specific proteins involved in cancer. The precise molecular target of TBio-4101 has not been disclosed in available information.

Who is developing TBio-4101?

TBio-4101 is being developed by Turnstone Biologics Corp., a biopharmaceutical company. The company's stock is traded under the ticker symbol TSBX.

What phase is TBio-4101 in?

TBio-4101 is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. Two Phase 1 trials are listed, one completed and one active but not recruiting.

What clinical trials is TBio-4101 in?

TBio-4101 is being studied in two Phase 1 trials. NCT05628883, a completed proof-of-concept study in relapsed or refractory melanoma, enrolled 17 participants. NCT06236425, an active trial in recurrent or metastatic head and neck squamous cell carcinoma, has enrolled 7 participants.

Is TBio-4101 the same as Turnstone Biologics' other drugs?

TBio-4101 is a distinct investigational monoclonal antibody developed by Turnstone Biologics. No alternative names for this drug have been reported in the available clinical trial information.