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VIR-5500

Phase 1

Hormone-refractory Prostate Cancer | Small molecule | Oncology |Vir Biotechnology, Inc.|Trials Updated: Oct 7, 2026

VIR-5500 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Aug 2023

VIR-5500 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

VIR-5500 clinical trials

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 Sites22

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)

LOWOct 7, 2026NCT05997615lastUpdatePostDate: changed
LOWOct 7, 2026NCT05997615lastUpdatePostDate: changed
LOWSep 10, 2026NCT05997615lastUpdatePostDate: changed
LOWSep 10, 2026NCT05997615lastUpdatePostDate: changed
MEDIUMAug 24, 2026NCT05997615lastUpdatePostDate: changed
MEDIUMAug 24, 2026NCT05997615lastUpdatePostDate: changed

Frequently asked questions about VIR-5500

What is VIR-5500 used for in hormone-refractory prostate cancer?

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. The drug is being studied in a clinical trial that evaluates its safety, pharmacokinetics, and preliminary efficacy in patients with this condition.

What does VIR-5500 target?

VIR-5500 targets PSMA, which is an antigen. PSMA is a well-known cell surface protein that is highly expressed in prostate cancer cells. By targeting PSMA, VIR-5500 is designed to interact with cancer cells that express this antigen, potentially offering a therapeutic approach for hormone-refractory prostate cancer.

Who makes VIR-5500?

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

What phase is VIR-5500 in?

VIR-5500 is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. The ongoing Phase 1 trial is actively recruiting participants to assess the drug's safety, pharmacokinetics, and preliminary efficacy in patients with hormone-refractory prostate cancer.

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. The trial is enrolling male patients aged 18 years and older with hormone-refractory prostate cancer.

Is VIR-5500 the same as AMX-500?

Yes, VIR-5500 is also known as AMX-500. The clinical trial NCT05997615, which is evaluating VIR-5500, is titled 'Safety, Pharmacokinetics, and Preliminary Efficacy of VIR-5500 (AMX-500) in Prostate Cancer,' confirming that both names refer to the same investigational drug.