Safety, Pharmacokinetics, and Preliminary Efficacy of VIR-5500 (AMX-500) in Prostate Cancer

September 9, 2026 updated by: Astellas Pharma Global Development, Inc.

A Phase 1, First-in-Human Study of the Safety, Pharmacokinetics, and Preliminary Efficacy of VIR-5500 (AMX-500) in Participants With Prostate Cancer

The study will be conducted in 4 parts and will commence with dose escalation of VIR-5500 as a monotherapy (Part 1), followed by combination escalation (Part 3a), monotherapy dose expansion (Part 2) and combination dose expansion (Part 4a).

  • Part 1 (Monotherapy Dose Escalation): Single-agent VIR-5500 dose escalation
  • Part 2 (Monotherapy Dose Expansion): Single-agent VIR-5500 dose expansion
  • Part 3 (Combination Dose Escalation): VIR-5500 plus another therapeutic agent dose escalation Part 3a (Combination Dose Escalation): VIR-5500 in combination with an androgen receptor signaling inhibitor (ARSI)
  • Part 4 (Combination Dose Expansion): VIR-5500 plus another therapeutic agent dose expansion Part 4a (Combination Dose Expansion): VIR-5500 in combination with an androgen receptor signaling inhibitor (ARSI)

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Duration of the study up to approximately 48 months.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
437

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • Australia
      • Melbourne, Australia, 3000
        • Recruiting
        • Investigational Site Number: 100
      • Sydney, Australia, 2010
        • Recruiting
        • Investigational Site Number: 101
  • Spain
      • Barcelona, Spain, 08035
        • Recruiting
        • Investigational Site Number: 250
      • Barcelona, Spain, 08023
        • Withdrawn
        • Investigational Site Number: 251
      • Madrid, Spain, 28223
        • Recruiting
        • Investigational Site Number: 252
      • Madrid, Spain, 28027
        • Recruiting
        • Investigational Site Number: 254
      • Pamplona, Spain, 31008
        • Recruiting
        • Investigational Site Number: 253
  • United Kingdom
      • London, United Kingdom, SM2 5PT
        • Recruiting
        • Investigational Site Number: 300
  • United States
    • California
      • Orange, California, United States, 92862
        • Recruiting
        • Uci Health Chao Family Comprehensive Cancer Center
      • Palo Alto, California, United States, 94304
        • Recruiting
        • Investigational Site Number: 403
    • Texas
      • Houston, Texas, United States, 77030
        • Recruiting
        • Investigational Site Number: 401
    • Virginia
      • Fairfax, Virginia, United States, 22031
        • Recruiting
        • Investigational Site number: 404
    • Washington
      • Seattle, Washington, United States, 98109
        • Recruiting
        • Investigational Site Number: 400

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

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)

    • PSA level ≥ 1 ng/mL that has increased on ≥ 2 successive occasions ≥ 1 week apart
    • Nodal or visceral progression as defined by RECIST v1.1 with PCWG3 modifications
    • Appearance of ≥ 2 new lesions in bone scan
  3. Have been treated with ≥ 1 second-generation androgen-signaling inhibitor, including abiraterone, apalutamide, darolutamide, and/or enzalutamide
  4. Have been treated with ≥ 1 prior taxane regimens (e.g., docetaxel, cabazitaxel)
  5. Are deemed unsuitable for standard of care

Applicable to Part 2, 3a and Part 4a,

  1. Have metastatic CRPC, defined by ≥ 1 metastatic lesion that is present on baseline CT, MRI, or bone scan imaging that has documented progressive disease (PD) based on ≥ 1 of the following criteria (per PCWG3):

    • PSA level ≥ 1 ng/mL that has increased on ≥ 2 successive occasions ≥ 1 week apart
    • Nodal or visceral progression as defined by RECIST v1.1 with PCWG3 modifications
    • Appearance of ≥2 new lesions in bone scan
  2. Participants with metastatic hormone sensitive prostate cancer (mHSPC) or with biochemical recurrent prostate cancer (BRPC) may also participate in select cohorts of this clinical trial.

Exclusion Criteria:

  1. Presence of dominant histopathological features representative of sarcomatoid, spindle cell, or neuroendocrine small cell components
  2. Has acute or chronic infections
  3. Has a concomitant medical or inflammatory condition that may increase the risk of toxicity to VIR-5500 (AMX-500), per the Investigator
  4. Has lesions in proximity of vital organs
  5. Has known active CNS metastases and/or carcinomatous meningitis The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Sequential Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Part 1: VIR-5500 Monotherapy Dose Escalation
VIR-5500 will be administered as a monotherapy in patients with mCRPC over a 21-day or 28-day cycle
Drug: VIR-5500
Pharmaceutical form: Solution for infusion Route of administration: Intravenous (IV) infusion
Experimental: Part 2: VIR-5500 Monotherapy Dose Expansion
VIR-5500 will be administered as a monotherapy in patients with mCRPC over a 21-day or 28-day cycle
Drug: VIR-5500
Pharmaceutical form: Solution for infusion Route of administration: Intravenous (IV) infusion
Experimental: Part 3a: VIR-5500 in combination with an ARSI for Dose Escalation
VIR-5500 will be administered in combination with ARSI over a 21-day or 28-day cycle
Drug: VIR-5500
Pharmaceutical form: Solution for infusion Route of administration: Intravenous (IV) infusion
Drug: Androgen receptor signaling inhibitor (ARSI)
Oral administration
Experimental: Part 4a: VIR-5500 in combination with an ARSI for Dose Expansion
VIR-5500 will be administered in combination with ARSI over a 21-day or 28-day cycle
Drug: VIR-5500
Pharmaceutical form: Solution for infusion Route of administration: Intravenous (IV) infusion
Drug: Androgen receptor signaling inhibitor (ARSI)
Oral administration

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Part 1 and 3a: Number of participants with treatment-emergent Adverse Events (AEs)
Time Frame: 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)
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
Part 1 and 3a: Incidence of Dose Limiting Toxicities (DLTs)
Time Frame: 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)
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to Day 21 or Day 28
Part 2 and 4a: Prostate-Specific Antigen (PSA) response rate
Time Frame: from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
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)
Time Frame: from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
All parts: Incidence of treatment emergent anti-drug antibodies (ADAs) to VIR-5500
Time Frame: 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)
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Time Frame
Part 2 and 4a: Number of participants with Adverse Events (AEs)
Time Frame: from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
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
Time Frame: from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
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)
Time Frame: from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
All parts: Duration of response (DoR)
Time Frame: from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
All parts: Progression Free Survival PFS
Time Frame: from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
All parts: Assessment of PK parameters: Cmax
Time Frame: from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
All parts: Assessment of PK parameters: AUC
Time Frame: from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
All parts: Assessment of PK parameters: Tmax
Time Frame: from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
All parts: Incidence of baseline anti-drug antibodies (ADAs) to VIR-5500
Time Frame: from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
All parts: Incidence of treatment emergent anti-drug antibodies (ADAs) to VIR-5500
Time Frame: from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months
from the Cycle 1(each cycle is 21 or 28 days), Day 1 up to approximately 48 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Astellas Pharma Global Development, Inc.

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Vir Biotechnology, Inc.

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Clinical Sciences & Operations, Sanofi

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
August 10, 2023

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
September 29, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
September 29, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
July 24, 2023

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 11, 2023

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
August 18, 2023

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
September 10, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 9, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
September 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • VIR-5500-V101
  • 2023 (U.S. NIH Grant/Contract: GRAMMY Museum Foundation)
  • U1111-1287-6968 (Registry Identifier: ICTRP)
  • 2023-503495-24 (Registry Identifier: CTIS)
  • AMX-500 (Other Identifier: Vir Biotechnology, Inc.)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Qualified researchers may request access to patient level data and related study documents including the clinical study report, study protocol with any amendments, blank case report form, statistical analysis plan, and dataset specifications. Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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