NCT06537596

89Zr-olaratumab Dosimetry in Participants With Soft Tissue Sarcoma

An Open-label, Phase 1 Study to Assess Safety, Tolerability, Dosimetry, Pharmacokinetics and Imaging Properties of 89Zr-olaratumab (89Zr-TLX300-CDx) in Participants With Soft Tissue Sarcoma.

• Status: Recruiting
• Phase: Phase 1
• Study type: Interventional
• Enrollment: 50 (estimated)
• Sponsor: Telix Pharmaceuticals (Innovations) Pty Ltd · Industry
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

Soft Tissue Sarcoma (STS) is a type of cancer that develops in soft tissues such as muscles, tendons, fat, blood vessels, and nerves. STSs generally express a protein called Platelet-Derived Growth Factor Receptor (PDGFR)α, which makes them a target for the development of STS therapies, such as olaratumab. Olaratumab has been identified as a promising candidate to which radioactive substances can be attached for imaging or therapeutic purposes. Thus, this first in human imaging trial aims to study olaratumab combined with a radioactive metal called zirconium-89 (89Zr-TLX300-CDx) as a potential new product that may be used for STS imaging and identification of patients that may benefit from future treatments targeting PDGFRα.

Detailed description

Platelet-derived growth factor receptor α (PDGFRα) is expressed on soft tissue sarcoma (STS) where it could act as a potential therapeutic target. Olaratumab is a PDGFRα-targeted antibody that has the potential to act as the targeting moiety for both imaging and therapeutic radioisotopes. Olaratumab's demonstrated safety profile and its ability to target PDGFRα on STS cell surfaces and be rapidly internalised, make it a promising candidate for use as a radionuclide targeting agent in STS. 89Zr-TLX300-CDx is being developed for PDGFRα molecular imaging with positron emission tomography (PET) in STS. The aim of this study is to provide proof-of-concept tumour targeting of 89Zr-TLX300-CDx and assess the safety and radiation dosimetry of radiolabelled olaratumab. This study will inform future development of olaratumab as a therapeutic radiopharmaceutical agent in STS. SCHEDULE OF ASSESSMENTS Part A and B: IMAGING: 1 single injection of 89Zr-TLX300-CDx on Day 1 and whole-body imaging at 6 days ± 1 day post-injection Blood Collection for PHARMACOKINETICS: Pre-injection, 4h ± 0.5h and 6 days ± 1 day post-injection. OPTIONAL: Imaging at 4h ± 0.5h post-injection. Part C: IMAGING: 1 single injection of 89Zr-TLX300-CDx on Day 1, whole-body imaging at 24h ± 4h post-injection, whole-body imaging at 4 days ± 1 post-injection and whole-body imaging at 7 days ± 1 day post-injection Blood collection for PHARMACOKINECTCS: Pre-injection, 4h ± 0.5h, 24h ± 4h, 4 days ± 1 day and 7 days ± 1 day post-injection. OPTIONAL: Dynamic imaging 15 min ± 2 min post-injection at selected sites (extended field-of-view scanner is available), imaging at 4h ± 0.5h post-injection and imaging at 7h ± 1hpost-injection

Conditions

• Soft Tissue Sarcoma

Interventions

Type	Name	Description
DRUG	89Zr-DFOsq-olaratumab (89Zr-TLX300-CDx)	Single administration of 89Zr-TLX300-CDx

Timeline

• Start date: 2024-10-31
• Primary completion: 2026-03-01
• Completion: 2026-08-01
• First posted: 2024-08-05
• Last updated: 2024-12-19

Locations

1 site across 1 country: Australia