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VIR-5818

Phase 1

Locally Advanced or Metastatic HER2-Expressing Cancers | Small molecule | Oncology |Vir Biotechnology, Inc.|Last Updated: Aug 19, 2026

Target and mechanism

Molecular targetHER2
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment645

FDA Designations

No designations recorded

Clinical trial landscape

VIR-5818 · 1 trial · 1 indication

Phase 1 1
NCT05356741To Access the Safety and Effects of Intravenous Administration of VIR-5818 Alone and in Combination With Pembrolizumab in Adult Participants With Locally Advanced or Metastatic HER2-Expressing CancersLocally Advanced or Metastatic HER2-Expressing Cancers
RECRUITING645 Analytics
PHASE1RECRUITING
To Access the Safety and Effects of Intravenous Administration of VIR-5818 Alone and in Combination With Pembrolizumab in Adult Participants With Locally Advanced or Metastatic HER2-Expressing Cancers
Locally Advanced or Metastatic HER2-Expressing CancersUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence of dose-limiting toxicity - Part 1 and Part 2
Up to approximately 21 days (Part 1) and 42 days (Part 2)
Number of participants with treatment-emergent adverse events (TEAEs) and serious adverse events (SAEs)- Parts 1, 2, 3, and 4
Up to approximately 55 months
Objective Response Rate (ORR) - Part 3 and Part 4
Up to approximately 55 months

ORR defined as a Complete Response (CR) or Partial Response (PR) per Response Evaluation Criteria in Solid Tumors (RECIST) v.1.1.

Duration of Response (DOR) - Part 3 and Part 4
Up to approximately 55 months

DOR defined as the time from the first occurrence of a documented objective response to the time of the first documented disease progression or death from any cause, whichever occurs first, per RECIST v.1.1.

Secondary Endpoints

ORR - Part 3 and Part 4
Up to approximately 55 months
DOR - Part 3 and Part 4
Up to approximately 55 months
Pharmacokinetics (PK) parameter: Area under the concentration-time curve (AUC)
Predose, intermediate timepoints at multiple cycles (1 Cycle = 21 days) up to approximately 55 months
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part 1 (dose escalation)EXPERIMENTALParticipants will receive single-agent VIR-5818
Part 2 (dose escalation)EXPERIMENTALParticipants will receive VIR-5818 plus pembrolizumab
Part 3 (dose expansion)EXPERIMENTALParticipants will receive single-agent VIR-5818
Part 4 (dose expansionEXPERIMENTALParticipants will receive VIR-5818 plus pembrolizumab

Interventions

NameTypeDescription
VIR-5818DRUGAdministered as IV infusion
pembrolizumabDRUGAdministered as IV infusion
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites12

Inclusion criteria: * Written informed consent by the participant (or legally acceptable representative if applicable) * Life expectancy of at least 12 weeks * Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 * Diseases under study, prior lines of therapy, and human epidermal ...

Countries:United StatesAustraliaFrancePortugalSpain
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Recent Changes (Last 90 Days)

MEDIUMAug 20, 2026NCT05356741primaryCompletionDate: changed
MEDIUMAug 20, 2026NCT05356741primaryCompletionDate: changed
MEDIUMAug 20, 2026NCT05356741primaryCompletionDate: changed
MEDIUMAug 20, 2026NCT05356741primaryCompletionDate: changed

Frequently asked questions about VIR-5818

What is VIR-5818 used for?

VIR-5818 is an investigational small molecule being developed for the treatment of locally advanced or metastatic HER2-expressing cancers. It is currently in Phase 1 clinical development and has not been approved by the FDA.

What does VIR-5818 target?

VIR-5818 targets HER2, a protein that is overexpressed in certain cancers. By targeting HER2, the drug aims to interfere with cancer cell growth and survival in patients with HER2-expressing tumors.

Who makes VIR-5818?

VIR-5818 is being developed by Vir Biotechnology, Inc., a company publicly traded under the ticker symbol VIR on the NASDAQ stock exchange.

What phase is VIR-5818 in?

VIR-5818 is in Phase 1 clinical development. It is being studied in an ongoing clinical trial that is currently recruiting participants, and it is not yet approved for commercial use.

What clinical trials is VIR-5818 in?

VIR-5818 is being evaluated in a Phase 1 clinical trial with the identifier NCT05356741. The trial is assessing the safety and effects of VIR-5818 alone and in combination with pembrolizumab in adult participants with locally advanced or metastatic HER2-expressing cancers.

Is VIR-5818 the same as any other drug?

VIR-5818 is a distinct investigational drug and is not known to be the same as any other approved or marketed medication. It is being studied as a monotherapy and in combination with pembrolizumab in clinical trials.