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Actinium Therapy for Late-stage Aggressive Sarcomas

NCT07156565 · Status: RECRUITING · Phase: PHASE1 · Type: INTERVENTIONAL · Enrollment: 30

Last updated 2026-03-17

No results posted yet for this study

Summary

The goal of this clinical trial is to learn about the safety of drug \[Ac225\]RTX-2358 and the diagnostic imaging agent \[Cu64\]LNTH-1363S. Additionally Ratio Therapeutics will learn if \[Ac225\]RTX-2358 drug is effective in treating advanced sarcoma.

The main questions the study aims to answer in Phase/Part 1 of the trial are:

* Is \[Ac225\]RTX-2358 tolerable or does it cause toxicities (medical problems) in patients.
* What is the most tolerable dose of \[Ac225\]RTX-2358
* Does the treatment show effectiveness on advanced sarcoma

Participants will:

* Take drug \[Ac225\]RTX-2358 once every 8 weeks (4 cycle target; 6 cycle maximum) over a period of 12 months
* Visit the clinic three times for the first week of cycle one, then once a week for the remaining 7 weeks of cycle 1 for check-ups and tests.
* For cycles 2-6: patient will visit the clinic once every 2 weeks for checkups and tests
* Remain in long term follow-up for a period of four additional years

Conditions

  • Advanced Soft Tissue Sarcoma

Interventions

DRUG

[Ac 225]RTX-2358

\[Ac225\]RTX-2358 will be given as an intravenous injection once every 8 weeks for up to 6 doses. Each group will receive a set administered activity level (dose) of \[Ac 225\]RTX 2358 given once every 8 weeks. The first group will received the lower dose, the second group will received the mid level dose, and the third group the highest dose. A Safety Review Committee will determine when/if it is appropriate to allow the next group to proceed.

DIAGNOSTIC_TEST

[Cu64]LNTH-1363S

\[Cu64\]LNTH-1363S is a investigational radioactive diagnostic imaging agent to demonstrate that the tumor expresses Fibroblast Activation Protein. An imaging test is performed after a single injection with \[Cu64\]LNTH-1363S 13-35 days before the first administration of study drug \[AC225\]RTX-2358 to confirm that the sarcoma has FAP expression.

Sponsors & Collaborators

  • Ratio Therapeutics, Inc.

    lead INDUSTRY

Study Design

Allocation
NA
Purpose
TREATMENT
Masking
NONE
Model
SEQUENTIAL

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2025-11-12
Primary Completion
2028-01-31
Completion
2032-01-31
FDA Drug
Yes

Countries

  • United States
  • Canada

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07156565 on ClinicalTrials.gov