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VIR-5525

Phase 1

Solid Tumor Malignancies | Small molecule | Oncology |Vir Biotechnology, Inc.|Last Updated: Apr 13, 2026

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 Enrollment450
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06960395Safety and Preliminary Efficacy of VIR-5525 and VIR-5525 + Pembrolizumab in Participants With Locally Advanced or Metastatic Solid TumorsPHASE1 RECRUITING 450Jul 22, 2025Aug 1, 2029Apr 13, 20264 United States, Australia
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Study Endpoints
Primary Endpoints
Primary Safety Objectives (Parts 1 and 3)
From Cycle 1, Day 1 (each cycle is 21 days), up to approximately 52 months.

Objective: To evaluate the safety and tolerability of escalating doses of VIR-5525 as monotherapy (Part 1) and in combination with pembrolizumab (Part 3). Endpoint: Incidence and severity of AEs, including DLTs, with severity determined according to NCI CTCAE v5.0, ASTCT CRS, or ASTCT ICANS Consensus Grading, as appropriate.

Primary Efficacy Objectives (Parts 2 and 4)
From Cycle 1, Day 1 (each cycle is 21 days), up to approximately 52 months.

Objective: To evaluate the preliminary anti-tumor activity of VIR-5525 as monotherapy (Part 2) and in combination with pembrolizumab (Part 4) at the recommended dose(s) for expansion cohorts. Endpoint: Objective response, defined as a CR or PR per RECIST v1.1.

Secondary Endpoints
Secondary Safety Objectives (Parts 1 and 3)
From Cycle 1, Day 1 (each cycle is 21 days), up to approximately 52 months.
Secondary Efficacy Objectives (Parts 1 and 3)
From Cycle 1, Day 1 (each cycle is 21 days), up to approximately 52 months.
Secondary Efficacy Objectives (Parts 2 and 4)
From Cycle 1, Day 1 (each cycle is 21 days), up to approximately 52 months.
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Part 1: VIR-5525 Monotherapy Dose EscalationEXPERIMENTALScreening Period: Up to 28 days Treatment Period: Once successfully screened, enrolled participants may receive study intervention of VIR-5525 in monotherapy.
Part 2: VIR-5525 Monotherapy Dose ExpansionEXPERIMENTALScreening Period: Up to 28 days Treatment Period: Once successfully screened, enrolled participants may receive study intervention of VIR-5525 in monotherapy.
Part 3: VIR-5525 Combination Dose EscalationEXPERIMENTALScreening Period: Up to 28 days Treatment Period: Once successfully screened, enrolled participants may receive study intervention of VIR-5525 in combination with pembrolizumab.
Part 4: VIR-5525 Combination Dose ExpansionEXPERIMENTALScreening Period: Up to 28 days Treatment Period: Once successfully screened, enrolled participants may receive study intervention of VIR-5525 in combination with pembrolizumab.
Interventions
NameTypeDescription
VIR-5525DRUGPharmaceutical Form: Solution for Infusion Route of Administration: Intravenous (IV) infusion
PembrolizumabDRUGPharmaceutical Form: Solution for Infusion Route of Administration: Intravenous (IV) infusion
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites4

Inclusion Criteria: I 01. Are ≥ 18 years of age, or at the country's legal age of majority of the legal adult age is \>18 years, at the time of signing the ICF. I 02. Have an ECOG performance status of 0 to 1. I 03. Have a life expectancy of at least 12 weeks. I 04. Have histological, pathologic...

Countries:United StatesAustralia
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT06960395primaryCompletionDate: changed
LOWMay 24, 2026NCT06960395studyFirstPostDate: changed