IMCR Immunocore Holdings plc
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Executive Summary
Immunocore presented updated Phase 1 data for brenetafusp in heavily pretreated advanced melanoma at ASCO 2026, showing a 6-month OS rate of 87% and DCR of 52% in 66 patients. The data support the 160 mcg dose selection for the ongoing Phase 3 PRISM-MEL-301 trial in first-line advanced melanoma. While the results are clinically promising, the small sample size and early-stage nature limit immediate stock-moving impact.
Actionable Insight
The Phase 1 data are encouraging but early-stage; the key catalyst is the Phase 3 PRISM-MEL-301 trial readout. Monitor for enrollment updates and interim data. The stock may see modest positive movement on ASCO presentation buzz, but sustained upside depends on Phase 3 results.
Key Facts
- Brenetafusp monotherapy in 66 heavily pretreated advanced melanoma patients showed 6-month OS rate of 87% and median OS of 14.3 months.
- Disease control rate (DCR) was 52% and overall response rate (ORR) was 12%.
- Data support 160 mcg dose selection for Phase 3 PRISM-MEL-301 trial (brenetafusp + nivolumab vs. standard nivolumab regimens) in first-line advanced melanoma.
- Clinical benefit was consistent across difficult-to-treat subgroups, including patients with primary PD-1 resistance (median OS 14.7 months).
- Brenetafusp was generally well tolerated; most common TRAEs were CRS (56%), rash (44%), pyrexia (44%), and chills (38%), predominantly low grade.
- A second poster showed IL7 may enhance ImmTAC anti-tumor activity in vitro and in vivo.
Financial Impact
No financial data provided; early-stage clinical data with no revenue or guidance impact.
Risk Factors
- Phase 3 trial may fail to replicate Phase 1 efficacy in a larger, randomized setting.
- Competition from existing PD-1/CTLA-4 and LAG-3 therapies in first-line melanoma.
- Safety profile includes CRS and lymphopenia, which could limit tolerability in broader patient populations.
- Small sample size (n=66) limits statistical reliability of efficacy estimates.
Market Snapshot
Documents Analyzed
This report is based on 1 press release from GlobeNewswire.
| Document | Accession Number |
|---|---|
| PRESS-RELEASE Data (Synthetic) | press-3303917 |
Track record builds as more directional reports settle.
Filters
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May 31, 2026
13d ago
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Press Release
| $29.13 $28.29 | ▼ −2.88% | ▼ −0.13% | $28.96 (−0.58%) |
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Apr 19, 2026
7w ago
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Press Release
| $31.46 $28.56 | ▼ −9.22% | ▼ −10.13% | $28.96 (−7.95%) |
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Apr 8, 2026
9w ago
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144
| $31.85 $31.64 | ▼ −0.66% | ▼ −4.18% | $28.96 (−9.07%) |
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Mar 17, 2026
12w ago
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Press Release
| $30.04 $30.28 | ▲ +0.80% | ▲ +1.51% | $28.96 (−3.60%) |
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Feb 25, 2026
15w ago
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8-K
| $32.16 $33.73 | ▲ +4.88% | ▲ +5.98% | $28.96 (−9.95%) |
US Market Status
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