ClinicalTrials.gg
CompletedNCT04904120TIMAR1Updated Nov 7, 2023

Targeted Imaging of Melanoma for Alpha-Particle Radiotherapy

A Phase 1 interventional study of [203Pb]VMT01 and [68Ga]VMT02 in Melanoma (Skin), Melanoma Stage IV and Melanoma, Uveal, sponsored by Perspective Therapeutics. Completed at 1 site in United States. Open to participants aged 18 Years to 89 Years. Per ClinicalTrials.gov, last updated 2023-11-07.

Primary conditionUveal MelanomaRegistry: MelanomaReclassifiedWhy we changed it
Registry
Melanoma — the first condition term the registry derived for this study.
ClinicalTrials.gg
Uveal Melanoma
Why
  1. The study's listed conditions name Uveal Melanoma, a narrower term within Melanoma.
Confidence
High: the new condition is named in the study's own listed conditions. Of 351 hand-checked studies reclassified this way, 68% were exactly right and 84% in the right disease family; the registry's first term was right for 5% (measured 2026-10-21). How we classify →
Wrong?
Tell us the study's main condition →

Sponsored by Perspective Therapeutics · Phase 1, Interventional, and Diagnostic

From the registry’s dates

  • Primary completion was Sep 2022, 4 years 1 month ago, and no results have been posted to the registry.

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Phase
Phase 1
Study type
Interventional
Enrollment
7
Allocation
Randomized
Ages
18 Years to 89 Years
Sex
All
01

Where this study stands

Counted across the records on this site · 2026-11-14

Among 190 studies in Uveal Melanoma with a site in United States — 25 open to participants now, 50 under way, 7 of them phase 3. Uveal Melanoma · United States.

Enrollment
144th of 162
7 · median 36
Started
2021
with 11 others
Phase 1
53 of 190
4 open now
Registered
145th of 190
by date

Among the 190 studies in Uveal Melanoma with a site in United States, this one is the 144th largest by enrollment of the 162 interventional ones that give a count, is one of 12 that started in 2021, is one of 53 in phase 1, and was the 145th registered.

Uveal Melanoma

281 studies on the registry are indexed under Uveal Melanoma; 50 are open to participants now.

Browse Uveal Melanoma studies →

Open to participants now

25 of the 190 studies in Uveal Melanoma with a site in United States are open now. Recruiting first, the newest first:

20 more — sign in →

All 25 open studies →

A study can be open while its sites in United States have not opened yet or have stopped. Only those recruiting at a site in United States →

Who these studies take

Of the 42 Uveal Melanoma studies recruiting now, 35 (83%) set no upper age limit and 4 (10%) stop at 75 or younger; 3 take children under 18; 1 takes healthy volunteers.

This study: 18 Years to 89 Years · all sexes · no healthy volunteers.

The full table on the hub →

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Watch this landscapeDownload CSVNarrow it in search →With an account: a weekly mail of what changed among 190 studies in Uveal Melanoma with a site in United States, or all of them as a file.
02

Study summary

The study hypothesis is that new imaging agents [203Pb]VMT01 and [68Ga]VMT02 can be safely used in humans without independent biological effect and can be used to image melanoma tumors expressing the melanocortin sub-type 1 receptor (MC1R) by SPECT/CT and PET/CT imaging modalities respectively.

Read the detailed description

This is a first-in-human study evaluating the suitability of [203Pb]VMT01 for SPECT/CT imaging and [68Ga]VMT02 for PET/CT imaging of MC1R-expressing metastatic melanoma. Study results will provide foundational data to develop imaging and dosing for future therapeutic trials of [212Pb]VMT01 for the treatment of metastatic melanoma.

The study will be a cross-over study with the participants serving as their own comparator. Participants with positive FDG-PET scans for stage IV (or inoperable stage III) metastatic melanoma will undergo SPECT/CT scans utilizing [203Pb]VMT01 followed a few weeks later by PET/CT scans utilizing [68Ga]VMT02, or vice versa. The order of the imaging agents will be randomly assigned.

03

Conditions studied

  • Melanoma (Skin)
  • Melanoma Stage IV
  • Melanoma, Uveal
  • Melanoma, Mucosal

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Keywords

  • Melanoma
  • Theranostic
  • Radiopharmaceutical
  • Radiotherapy
  • Alpha-Particle
  • Diagnostic
  • Metastatic
  • Single Photon Emission Computed Tomography (SPECT)
  • Positron Emission Tomography (PET)
  • Melanocortin Receptor Sub-type 1 (MC1R)
  • VMT01
  • VMT02
  • Pb-203
  • Ga-68
  • Cancer
  • Immunohistochemistry (IHC)
04

In context

Uveal Melanoma Reclassified

281 studies on the registry are indexed under Uveal Melanoma; 50 are open to participants now.

This study's enrollment of 7 is below the median of 37 across 222 interventional studies indexed under Uveal Melanoma.

Browse Uveal Melanoma studies →

Lead sponsor

Perspective Therapeutics is the lead sponsor of 4 studies on the registry; 3 are open to participants now.

Compared within Uveal Melanoma, this study's primary condition as ClinicalTrials.gg classifies it; the registry's first condition term is Melanoma. The counts are of registry records indexed under each term, refreshed daily. How we classify →

05

Who can participate

Ages eligible
18 Years to 89 Years
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  1. Diagnosed with Stage IV melanoma, or inoperable Stage III equivalent
  2. Baseline fluorodeoxyglucose (FDG)-PET scan available from within 30 days prior to date of enrollment
  3. Blood counts and metabolic results within protocol limits within 14 days prior to enrollment
  4. Ability to lie flat and still for a minimum of two hours for imaging
  5. Male and female participants with must agree to use highly effective in preparation of the study, during the study, and for 4 weeks following the last dose of an investigative imaging agent
  6. Documented of at least 3 months

Exclusion criteria

Exclusion Criteria:

  1. Active secondary
  2. Prior treatment (for any reason) with radioactive nuclides; imaging tracers are acceptable
  3. Pregnancy or breast feeding a child
  4. Uncontrolled infection
  5. Treatment with another drug within 30 days prior to enrollment date
  6. Any treatment with BRAF inhibitors since the baseline FDG-PET scan or plans for such treatment during the study
  7. Kidney function not within protocol limits
  8. >40 kg/m2
  9. History of a condition resulting in anaphylaxis or angioedema
Terms in these criteria, in plain language(7)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Metastases

Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.

Reproductive potential

Able to have children. For women this usually means from the first period until menopause, unless permanently unable to through surgery; for men, unless permanently sterile. Read who the line is about — participants, women, men, or their partners.

Criteria about it usually ask for contraception during the study and for a time after it.

Contraception

Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.

Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.

Life expectancy

The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.

Cancer (malignancy)

Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.

Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.

Investigational drug or device

A drug or device being studied in a clinical trial.

It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.

BMI (body mass index)

Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.

What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.

06

Study design

Phase
Phase 1
Primary purpose
Diagnostic
Allocation
Randomized
Intervention model
Crossover assignment
Masking
Single (Outcomes assessor)
Enrollment
7 participants (actual)

Study arms

  • Active comparator
    [203Pb]VMT01 first

    Participants 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.

    Drug: [203Pb]VMT01 · Drug: [68Ga]VMT02

  • Active comparator
    [68Ga]VMT02 first

    Participants 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.

    Drug: [203Pb]VMT01 · Drug: [68Ga]VMT02

Interventions

  • Drug[203Pb]VMT01

    Diagnostic imaging radiopharmaceutical; by intravenous infusion

  • Drug[68Ga]VMT02

    Diagnostic imaging radiopharmaceutical; by intravenous infusion

07

What researchers measure

Primary outcomes

  1. Number of Participants with Study Imaging Agent-Associated Adverse Events (AE) as Assessed by Common Terminology Criteria for Adverse Events (CTCAE) Version 5.0.

    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.

    Time frame: 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).

  2. Biodistribution of [68Ga]VMT02

    Biodistribution will be calculated by utilizing PET/CT scans.

    Time frame: 12 hours

  3. Biodistribution of [203Pb]VMT01

    Biodistribution will be calculated by utilizing SPECT/CT scans.

    Time frame: 24 hours

  4. Peak Plasma Concentration (Cmax) of [203Pb]VMT01

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

    Time frame: 24 hours

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

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

    Time frame: 24 hours

  6. Renal Excretion of [203Pb]VMT01

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

    Time frame: 24 hours

  7. Modeling of [203Pb]VMT01 Dosimetry

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

    Time frame: 24 hours

Secondary outcomes

  1. MC1R Expression Correlation Between Archived Tumor Tissue and Study Imaging

    Archived (previously collected) tumor tissue will be tested for MC1R expression and compared to study images obtained using MC1R targeted imaging agents, \[203Pb\]VMT01 and \[68Ga\]VMT02. The data will be assessed for an association between positive tissue and positive images.

    Time frame: Historical tissue sample (collected <365 days before study enrollment) compared to Visit 1 (Day 1) and Visit 3 (Day 21-34) imaging

  2. Cancer Site Correlation Between Standard of Care Imaging Compared to Study Imaging

    Sites of cancer detected previously by imaging will be compared to the presence or absence of positive imaging scans with the study agents, \[203Pb\]VMT01 and \[68Ga\]VMT02.

    Time frame: Historical imaging information compared to Visit 1 (Day 1) and Visit 3 (Day 21-34) imaging

  3. Dosimetry will be Calculated for each Study Imaging Agent by Measuring the Cumulative Absorbed Dose of Radiation to the Participant's Individual Organs and Tumors

    For a given participant, dosimetry calculations will be compared between the two imaging agents with respect to cumulative absorbed dose of radiation.

    Time frame: Visit 1 (Day 1) and Visit 3 (Day 21-34) imaging

08

Study locations

1 site
  • Mayo Clinic
    Rochester, Minnesota 55905, United States
09

References and documents

Individual participant data

Plan to share: Yes — All de-identified individual participant data (IPD) that underlies results in a peer-reviewed scientific publication will be shared.

No publications or documents are linked to this record.

10

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Ran from Mar 2021 to primary completion in Sep 2022, 18 months.

Of 32 phase 1 interventional studies under Uveal Melanoma, half reached primary completion within 45 months of starting (the median), counting those still running; a quarter within 32 and three quarters within 66. This study's 18 months is below that.

How these figures are worked out, and which studies are left out of them.

Registered
May 3, 2021
First posted
May 27, 2021
StartActual
Mar 5, 2021
Primary completionActual
Sep 20, 2022
CompletionActual
Sep 20, 2022
Last update
Nov 7, 2023
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Nov 7, 2023, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT04904120
Lead sponsor
Perspective Therapeutics
Collaborators
Mayo Clinic
Responsible party
Sponsor
First posted
May 27, 2021
Start date
Mar 5, 2021
Primary completion
Sep 20, 2022
Completion
Sep 20, 2022
Last update
Nov 7, 2023

Study contacts

Frances L Johnson, MD
principal investigator · Perspective Therapeutics
Geoffrey B Johnson, MD, PhD
principal investigator · Mayo Clinic

Oversight

Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is completed, as verified in Jun 2022. You cannot join it, but the record below documents what was studied.

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