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VIR-5818

Phase 1

Locally Advanced or Metastatic HER2-Expressing Cancers | Small molecule | Oncology |Vir Biotechnology, Inc.|Last Updated: Sep 24, 2025

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
CONTROLLEDBiomarker
Total Trials1
Total Enrollment645
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
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 CancersPHASE1 RECRUITING 645Apr 13, 2022Aug 16, 2027Sep 24, 202510 Australia, France +2
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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 — N/A
SexALL
Healthy VolunteersYes
Study Sites10

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:AustraliaFrancePortugalSpain
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT05356741primaryCompletionDate: changed
LOWMay 24, 2026NCT05356741studyFirstPostDate: changed