NCT06298916

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

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: Recruiting
• Phase: Phase 1 / Phase 2
• Study type: Interventional
• Enrollment: 26 (estimated)
• Sponsor: Lantheus Medical Imaging · Industry
• Sex: All
• Age: 15 Years
• Healthy volunteers: Not accepted

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 imaging time window of 64Cu-LNTH-1363S, and to compare its imaging biodistribution with FAP expression by IHC in patients with sarcomas or GIT cancers. The study will be conducted in 2 parts (Part 1 and Part 2).

Detailed description

Part 1 will determine the biodistribution, dosimetry, optimal dose (radioactivity) and imaging time window of 64Cu-LNTH-1363S in 6 evaluable patients with supposed FAP-expressing solid tumors (metastatic sarcomas). All six patients will receive 8 ± 1 mCi (\~90 μg mass dose) in this study. All images will undergo analysis by blinded central readers. Optimal radioactivity and timing window will be determined based on image quality scores and measured tumor-to-background ratio. 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 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. Part 2 of the study will last approximately 10 to 11 weeks and includes: a Screening Period (up to 14 days), a 1-day Intervention Period, a 1 day Safety Followup 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 characterizing the concentration-response relationship of 64Cu-LNTH-1363S for QT and corrected QT interval (QTc) prolongation.

Conditions

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

Interventions

Type	Name	Description
COMBINATION_PRODUCT	64Cu-LNTH-1363S	64Cu-LNTH-1363S, is a highly selective, high affinity FAP inhibitor (FAPi) that is radiolabeled with Copper-64 (64Cu) for PET/CT Imaging,

Timeline

• Start date: 2025-08-01
• Primary completion: 2025-11-01
• Completion: 2026-04-01
• First posted: 2024-03-07
• Last updated: 2025-08-12

Locations

5 sites across 1 country: United States

Regulatory

• FDA-regulated drug study