The first drug to improve survival in metastatic uveal melanoma, and the first TCR-based bispecific.
Tebentafusp is an ImmTAC: a soluble, affinity-enhanced T-cell receptor that recognises a gp100 peptide presented on HLA-A*02:01, fused to an anti-CD3 single-chain antibody that recruits any T cell to the melanoma cell. Because gp100 is a melanocyte-lineage protein, the drug also hits skin melanocytes, so rash and pruritus are expected. It is given weekly after step-up doses of 20, 30 and 68 micrograms, with inpatient monitoring for the first three doses because of cytokine release syndrome and hypotension. Approved in 2022 in the US and EU for HLA-A*02:01-positive metastatic uveal melanoma, it was the first drug to improve survival in that disease (overall survival 21.7 versus 16.0 months) and the first TCR-based bispecific approved anywhere. It is being tested in cutaneous melanoma after PD-1 therapy (TEBE-AM), and Immunocore's PRAME-directed brenetafusp follows the same design.
Backbone ribbon from PDB 1IGT. RCSB PDB 1IGT. The ribbon widens where the chain is folded into a regular pattern and narrows where it is a loose loop.
No public structure of tebentafusp; intact IgG shown as reference.
Soluble affinity-enhanced TCR against gp100 peptide-HLA fused to anti-CD3 scFv. Connects to gp100 (PMEL), CD3 and HLA-A.
1.Soluble high-affinity TCR binds gp100 peptide presented on HLA-A*02:01 on melanoma cells
Source: www.fda.gov/drugs/resources-information-approved-drugs/oncology-cancer-hematologic-malignancies-approval-notifications. Doses are for orientation; the current label governs.
Given by infusion or injection in a clinic or hospital outpatient department, so it is a Part B drug: Medicare pays 80% after the Part B deductible and the patient owes 20% coinsurance, uncapped in Original Medicare unless a Medigap policy applies. Weekly infusion for HLA-A*02:01-positive uveal melanoma; first doses in hospital for CRS monitoring.
Covered under the medical benefit with prior authorisation confirming diagnosis, biomarker status and line of therapy; site-of-care policies may steer infusions away from hospital outpatient departments. HLA-A*02:01 genotype must be documented.
20% Part B coinsurance on a high-cost infusion adds up quickly: Medigap Plan G or N, Medicare Advantage maximum out-of-pocket, Medicaid dual eligibility, or a charity fund are the usual buffers.
Sources: Medicare.gov: Chemotherapy · Medicare.gov: Prescription drugs (outpatient, Part B). Not medical or financial advice; verify with your plan.
Sources: NICE TA1027 · SMC advice: tebentafusp. Funding decisions are indication-specific and change monthly; verify with NICE and your treating team.
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Breakthrough Therapy designation source
HLA-A*02:01+ unresectable or metastatic uveal melanoma: first TCR therapeutic approved source
EMA approval source
| Region | Year | Indication |
|---|---|---|
| US | 2022 | HLA-A*02:01+ metastatic uveal melanoma |
| Adverse event |
|---|
| Cytokine release syndrome |
| Rash |
| Pyrexia |
| Pruritus |
| Fatigue |
| Nausea |
| Hypotension |
| Transaminase increase |
Events listed without rates were not read from a primary source; see the label. Blank cells mean the figure was not sourced, not that it is zero.
| Country | Reimbursement | List price | Assistance |
|---|---|---|---|
| United States | Medicare Part B (physician-administered); commercial plans per formulary | not disclosed | kimmtrak.com |
| United Kingdom | NICE: recommended for HLA-A*02:01+ metastatic uveal melanoma (TA867) | not disclosed | - |
List prices are manufacturer or Medicare figures where publicly disclosed; net prices after rebates are usually lower. Reimbursement changes; check the payer.
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Query for this drug: (TITLE:"Tebentafusp" OR ABSTRACT:"Tebentafusp" OR TITLE:"Kimmtrak" OR ABSTRACT:"Kimmtrak") AND (cancer OR tumor OR tumour OR oncology OR carcinoma OR lymphoma OR leukemia OR leukaemia OR myeloma OR sarcoma OR melanoma OR glioma). Results are unfiltered search hits about Tebentafusp, not a curated reading list.
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