64Cu-LNTH-1363S in Patients With Sarcoma or Gastrointestinal Tract Cancer — PHANTOM  

Colorectal Cancer Clinical Trial

Official title: A Phase 1/2a Study Utilizing 64Cu-LNTH-1363S (64Cu Radiolabeled FAPi PET/CT Imaging Agent) in Patients With Sarcoma or Gastrointestinal Tract Cancer (PHANTOM Trial)

Status Not yet recruiting

Clinical Trial Summary

This is a multicenter, open-label, prospective Phase 1/2a study to assess safety and tolerability, establish dosimetry and to identify an optimal imaging dose (radioactivity and mass dose) and imaging time window of 64Cu-LNTH-1363S (64Cu Radiolabeled FAPi PET/CT Imaging Agent) and to compare its imaging biodistribution with FAP expression by immunohistochemistry (IHC) in patients with sarcomas or GIT cancers. The study will be conducted in 2 parts (Part 1 and Part 2).

Clinical Trial Description

Part 1 will determine the biodistribution, dosimetry, optimal dose (radioactivity and mass dose) and imaging time window of 64Cu-LNTH-1363S in 12 evaluable patients with supposed FAP-expressing solid tumors (metastatic sarcomas). Two 64Cu-LNTH-1363S mass doses of ~50 μg and ~90 μg will be studied. Six patients will receive 8 ± 1 millicurie (mCi) (~50 μg mass dose), followed by another 6 patients will receive 8 ± 1 mCi (~90 μg mass dose). Two additional radioactivity (6 and 4 mCi) doses will be simulated by reprocessing raw data from each patient's PET scans.

This study does not involve randomization for dose groups. It will commence with the lower dose group (~50 μg mass dose). After enrolling 6 evaluable patients in this dose group, recruitment for the next dose group (~90 μg mass dose) will begin and conclude upon enrolling 6 evaluable patients. Subsequently, the images will undergo analysis by blinded central readers.

Part 1 of the study will last approximately 3 weeks for each patient and includes a Screening Period (up to 14 days), a 1-day Intervention Period, and a Safety Follow-up Period (7 days post dose).

Part 2 will evaluate 64Cu-LNTH-1363S imaging correlation with FAP expression measured by IHC (SUVmax and SUVmean vs IHC score) in 20 evaluable patients with non-metastatic, operable, supposed FAP-expressing solid tumors (sarcomas, esophageal, gastric, pancreatic, colorectal) planned for surgery within 60 days (from study imaging). If the optimal radioactivity determined from Part 1 is less than 8 ± 1 mCi, the first 6 patients in Part 2 will be used to validate this optimal radioactivity. This mean the image quality scores of the first 6 patients will need to be calculated. If the sum of the average image quality scores of the 6 patients is higher or equal to 10.5, then the lower optimal radioactivity determined in Part 1 will be used for the remaining 14 patients, otherwise the remaining 14 patients in Part 2 will be injected with 8 ± 1 mCi of 64Cu-LNTH-1363S. Part 2 of the study will last approximately 10 to 11 weeks for each patient and includes: a Screening Period (up to 14 days), a 1-day Intervention Period, a 1-day Safety Follow-up Period (Day 2), and a Scheduled Surgery: IHC Sample Collection Period (from Day 2 to Day 60).

Both Part 1 and Part 2 of the study will also monitor cardiac safety by detecting changes in HR, T wave, ST segment and other ECG parameters and look for signals suggesting a concentration-response relationship of 64Cu-LNTH-1363S for QT and corrected QT interval (QTc) prolongation. ;

Related Conditions & MeSH terms

• Colorectal Cancer
• Esophageal Cancer
• Gastric Cancer
• Gastrointestinal Neoplasms
• Metastatic Sarcoma
• Pancreatic Cancer
• Sarcoma

• NCT number: NCT06298916
• Study type: Interventional
• Source: Lantheus Medical Imaging
• Status: Not yet recruiting
• Phase: Phase 1/Phase 2
• Start date: May 2024
• Completion date: April 2026