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VMT01

Phase 1

Melanoma (Skin) | Small molecule | Oncology |Perspective Therapeutics, Inc.|Last Updated: Jun 10, 2026

Target and mechanism

Molecular targetMC1R
ModalitySmall molecule

Also known as [203Pb]VMT01

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment7

FDA Designations

FAST_TRACK

Clinical trial landscape

VMT01 · 2 trials · 7 indications

Phase 1 2
NCT05655312MC1R-targeted Alpha-particle Monotherapy and Combination Therapy Trial With Nivolumab in Adults With Advanced MelanomaRecurrent Melanoma (Skin)
RECRUITING300 Analytics
NCT04904120Targeted Imaging of Melanoma for Alpha-Particle RadiotherapyMelanoma (Skin)
COMPLETED7 Analytics
PHASE1RECRUITING
MC1R-targeted Alpha-particle Monotherapy and Combination Therapy Trial With Nivolumab in Adults With Advanced Melanoma
Recurrent Melanoma (Skin)Unlock trial analytics
PHASE1COMPLETED
Targeted Imaging of Melanoma for Alpha-Particle Radiotherapy
Melanoma (Skin)Unlock trial analytics

Study Endpoints

Primary Endpoints

Number of subjects with dose-limiting toxicities (DLTs) after the first administration of [212Pb]VMT01 as a monotherapy or in combination with nivolumab.
Incidence of DLTs during the first 42 days of study Treatment will be assessed.

DLTs describe side effects of a drug that are serious enough to prevent an increase in dose

Objective response rate (ORR) per Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1
Up to approximately 2 years

Percentage of subjects with complete responses (CRs) or partial responses (PRs) to at least 1 administration of \[212Pb\]VMT01 as a monotherapy or in combination with nivolumab

Incidence and severity of adverse events (AEs) and serious adverse events (SAEs) following administration of [212Pb]VMT01 as a monotherapy or in combination with nivolumab
Up to approximately 2 years

Any untoward medical occurrence in a clinical investigational participant administered \[212Pb\]VMT01 as a monotherapy or in combination with nivolumab. Associated AE or SAE is assessed by Common Terminology Criteria for Adverse Events (CTCAE) Version 5.0

Number of Participants with Study Imaging Agent-Associated Adverse Events (AE) as Assessed by Common Terminology Criteria for Adverse Events (CTCAE) Version 5.0.
Visit 1 (Day 1) through Visit 5 (approximately Day 60 but could extend up to Day 108); ongoing Serious Adverse Events (SAE) will be followed for no longer than Day 65 or 30 days from the date of the SAE report (whichever is later).

Adverse Events (AEs) will be assessed for severity according to CTCAE v5.0 and for relatedness to each of the investigative imaging agents (\[203Pb\]VMT01 and \[68Ga\]VMT02). Assessments attributed as possibly, probably, or definitely related to the imaging agent will be considered related.

Biodistribution of [68Ga]VMT02
12 hours

Biodistribution will be calculated by utilizing PET/CT scans.

Biodistribution of [203Pb]VMT01
24 hours

Biodistribution will be calculated by utilizing SPECT/CT scans.

Peak Plasma Concentration (Cmax) of [203Pb]VMT01
24 hours

Cmax will be determined by blood sampling and direct radioactivity measurements.

Area Under the Plasma Concentration Versus Time Curve (AUC) for [203Pb]VMT01
24 hours

AUC will be determined by blood sampling and direct radioactivity measurements.

Renal Excretion of [203Pb]VMT01
24 hours

Renal excretion will be determined by urine sampling and direct radioactivity measurements.

Modeling of [203Pb]VMT01 Dosimetry
24 hours

Dosimetry will be modeled by utilizing the SPECT/CT scans.

Secondary Endpoints

Duration of response (DOR) following treatment with [212Pb]VMT01 as a monotherapy and in combination with nivolumab as assessed by RECIST v1.1 criteria
Up to approximately 2 years
Progression free survival (PFS) for subjects receiving at least one administration of [212Pb]VMT01 as a monotherapy and in combination with nivolumab, as assessed by RECIST v1.1 criteria
Up to approximately 2 years
Determination of pharmacokinetic properties (PK) of [212Pb]VMT01: Area under the concentration versus time curve
Up to week 16
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Monotherapy-Dose FindingEXPERIMENTALEnrolled subjects will be treated with \[212Pb\]VMT01 to determine optimal biological dose (OBD). A dosimetry sub-set utilizing \[203Pb\]VMT01 has been incorporated.
Combination Therapy-Dose FindingEXPERIMENTALEnrolled subjects will be treated with \[212Pb\]VMT01 in combination with nivolumab to determine OBD. A dosimetry sub-set utilizing \[203Pb\]VMT01 has been incorporated.
Monotherapy - Dose ExpansionEXPERIMENTALSubjects will be enrolled at previously identified recommended phase 2 dose (RP2D) for confirmation of the RP2D and regimen for the Phase 2 dose-expansion cohort. A dosimetry sub-set utilizing \[203Pb\]VMT01 has been incorporated.
Combination Therapy - Dose ExpansionEXPERIMENTALSubjects will be enrolled at previously identified RP2D for its confirmation and verification of regimen for the Phase 2 dose-expansion cohort. A dosimetry sub-set utilizing \[203Pb\]VMT01 has been incorporated.
[203Pb]VMT01 firstACTIVE_COMPARATORParticipants randomized to this arm will receive imaging agent \[203Pb\]VMT01 and undergo SPECT/CT imaging first. Later, participants in this arm will receive \[68Ga\]VMT02 and undergo PET/CT imaging.
[68Ga]VMT02 firstACTIVE_COMPARATORParticipants randomized to this arm will receive imaging agent \[68Ga\]VMT02 and undergo PET/CT imaging first. Later, participants in this arm will receive \[203Pb\]VMT01 and undergo SPECT/CT imaging.

Interventions

NameTypeDescription
[203Pb]VMT01DRUG\[203Pb\]VMT01 is administered intravenous (IV) as an imaging agent for SPECT/CT
[212Pb]VMT01DRUGSubjects with positive uptake of \[203Pb\]VMT01 will receive a fixed dose of \[212Pb\]VMT01 administered IV every 8 weeks starting at Cycle 1 Day 1.
NivolumabDRUGFor all combination-therapy cohorts, 480 mg nivolumab will be administered every 4 weeks as an IV infusion.
[68Ga]VMT02DRUGDiagnostic imaging radiopharmaceutical; by intravenous infusion
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Eligibility Criteria

Age Range18 Years to 90 Years
SexALL
Healthy VolunteersNo
Study Sites13

Inclusion Criteria: * Ability to understand and willingness to provide informed consent, willingness to comply with all study procedures for the duration of the study * Aged ≥ 18 years * Diagnosed with unresectable Stage III or Stage IV metastatic or recurrent melanoma * Previously progressed (radi...

Countries:United States
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Recent Changes (Last 90 Days)

LOWJun 10, 2026NCT05655312lastUpdatePostDate: changed
LOWJun 10, 2026NCT05655312lastUpdatePostDate: changed

Frequently asked questions about VMT01

What is VMT01 used for in melanoma?

VMT01 is an investigational small molecule being studied for the treatment of melanoma, including recurrent melanoma of the skin. It is a targeted alpha-particle therapy designed to deliver radiation to melanoma cells. VMT01 is currently in Phase 1 clinical development and has not been approved by the FDA.

What does VMT01 target?

VMT01 targets the melanocortin 1 receptor (MC1R), which is expressed on melanoma cells. By binding to MC1R, VMT01 delivers alpha-particle radiation directly to the tumor, potentially killing cancer cells while sparing surrounding healthy tissue. This targeted approach is being evaluated in clinical trials for advanced melanoma.

Who is developing VMT01?

VMT01 is being developed by Perspective Therapeutics, Inc., a biopharmaceutical company traded on the stock exchange under the ticker symbol CATX. The company is conducting clinical trials to evaluate the safety and efficacy of VMT01 in patients with melanoma.

What phase is VMT01 in?

VMT01 is currently in Phase 1 clinical development. It is an investigational drug, meaning it has not yet received FDA approval. The drug is being studied in clinical trials to assess its safety, dosing, and preliminary efficacy in patients with advanced melanoma.

What clinical trials is VMT01 in?

VMT01 is being evaluated in two clinical trials. NCT04904120 is a completed Phase 1 study of targeted imaging for alpha-particle radiotherapy in melanoma. NCT05655312 is an ongoing Phase 1 trial testing VMT01 as a monotherapy and in combination with nivolumab in adults with advanced melanoma.

Is VMT01 the same as [203Pb]VMT01?

Yes, VMT01 is also known as [203Pb]VMT01. The [203Pb] designation refers to the lead-203 isotope used in the compound for imaging purposes. This alternative name is used in clinical research to specify the radiolabeled form of the drug.