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VIR-5500

Phase 1

Hormone-refractory Prostate Cancer | Small molecule | Oncology |Vir Biotechnology, Inc.|Last Updated: Aug 24, 2026

Target and mechanism

Molecular targetPSMA
Target classAntigen
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment437

FDA Designations

No designations recorded

Clinical trial landscape

VIR-5500 · 1 trial · 1 indication

Phase 1 1
NCT05997615Safety, Pharmacokinetics, and Preliminary Efficacy of VIR-5500 (AMX-500) in Prostate CancerHormone-refractory Prostate Cancer
RECRUITING437 Analytics
PHASE1RECRUITING
Safety, Pharmacokinetics, and Preliminary Efficacy of VIR-5500 (AMX-500) in Prostate Cancer
Hormone-refractory Prostate CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

All parts: Incidence of treatment emergent anti-drug antibodies (ADAs) to VIR-5500
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months

Incidence and severity of AEs according to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE)

Part 1 and 3a: Incidence of Dose Limiting Toxicities (DLTs)
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to Day 21 or Day 28

Incidence and nature of DLTs according to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE)

Part 2 and 4a: Prostate-Specific Antigen (PSA) response rate
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
Part 2 and 4a: Objective Response Rate (ORR)
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
Part 1 and 3a: Number of participants with treatment-emergent Adverse Events (AEs)
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months

Incidence and severity of AEs according to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE)

Secondary Endpoints

Part 2 and 4a: Number of participants with Adverse Events (AEs)
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
Part 1 and 3a: PSA response rate
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
Part 1 and 3a: Objective Response Rate (ORR)
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part 1: VIR-5500 Monotherapy Dose EscalationEXPERIMENTALVIR-5500 will be administered as a monotherapy in patients with mCRPC over a 21-day or 28-day cycle
Part 2: VIR-5500 Monotherapy Dose ExpansionEXPERIMENTALVIR-5500 will be administered as a monotherapy in patients with mCRPC over a 21-day or 28-day cycle
Part 3a: VIR-5500 in combination with an ARSI for Dose EscalationEXPERIMENTALVIR-5500 will be administered in combination with ARSI over a 21-day or 28-day cycle
Part 4a: VIR-5500 in combination with an ARSI for Dose ExpansionEXPERIMENTALVIR-5500 will be administered in combination with ARSI over a 21-day or 28-day cycle

Interventions

NameTypeDescription
VIR-5500DRUGPharmaceutical form: Solution for infusion Route of administration: Intravenous (IV) infusion
Androgen receptor signaling inhibitor (ARSI)DRUGOral administration
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Eligibility Criteria

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

Inclusion Criteria: Applicable to Parts 1 and 2 1. Have metastatic disease, defined by ≥ 1 metastatic lesion that is present on baseline computed tomography (CT), magnetic resonance imaging (MRI), or bone scan imaging 2. Have documented progressive mCRPC based on ≥ 1 of the criteria (per PCWG3) ...

Countries:United StatesAustraliaSpainUnited Kingdom
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Recent Changes (Last 90 Days)

MEDIUMAug 24, 2026NCT05997615lastUpdatePostDate: changed
MEDIUMAug 24, 2026NCT05997615lastUpdatePostDate: changed
MEDIUMJun 4, 2026NCT05997615Enrollment: 390 → 437
MEDIUMJun 4, 2026NCT05997615Enrollment: 390 → 437
MEDIUMJun 4, 2026NCT05997615Enrollment: 390 → 437
MEDIUMJun 4, 2026NCT05997615Enrollment: 390 → 437

Frequently asked questions about VIR-5500

What is VIR-5500 used for?

VIR-5500 is an investigational small molecule being developed for the treatment of hormone-refractory prostate cancer. It is currently in Phase 1 clinical development and has not been approved by regulatory authorities. The drug is being studied in a clinical trial that is recruiting participants.

What does VIR-5500 target?

VIR-5500 targets PSMA, which is an antigen expressed on prostate cancer cells. By targeting PSMA, the drug is designed to interact with cancer cells that display this antigen. This mechanism is being evaluated in early-stage clinical trials for hormone-refractory prostate cancer.

Who makes VIR-5500?

VIR-5500 is being developed by Vir Biotechnology, Inc., a company listed on the stock exchange under the ticker symbol VIR. The company is conducting clinical research on this investigational drug for the treatment of hormone-refractory prostate cancer.

What phase is VIR-5500 in?

VIR-5500 is in Phase 1 clinical development. This means it is an investigational drug that is currently being studied in early-stage trials to evaluate its safety, pharmacokinetics, and preliminary efficacy. It is not yet approved for commercial use.

What clinical trials is VIR-5500 in?

VIR-5500 is being studied in a Phase 1 clinical trial with the identifier NCT05997615. This trial is titled "Safety, Pharmacokinetics, and Preliminary Efficacy of VIR-5500 (AMX-500) in Prostate Cancer" and is currently recruiting participants in the United States, Australia, Spain, and the United Kingdom.

Is VIR-5500 the same as AMX-500?

Yes, VIR-5500 is also known as AMX-500. The clinical trial for this drug, NCT05997615, refers to it as VIR-5500 (AMX-500), indicating that both names are used for the same investigational compound in development for hormone-refractory prostate cancer.