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64Cu-LNTH-1363S

Phase 1

Metastatic Sarcoma | Small molecule | Oncology |Lantheus Holdings, Inc.|Last Updated: Aug 12, 2025

Target and mechanism

Molecular targetFAP
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMC
Total Trials1
Total Enrollment26

FDA Designations

No designations recorded

Clinical trial landscape

64Cu-LNTH-1363S · 1 trial · 6 indications

Phase 1 1
NCT0629891664Cu-LNTH-1363S in Patients With Sarcoma or Gastrointestinal Tract CancerMetastatic Sarcoma
RECRUITING26 Analytics
PHASE1RECRUITING
64Cu-LNTH-1363S in Patients With Sarcoma or Gastrointestinal Tract Cancer
Metastatic SarcomaUnlock trial analytics

Study Endpoints

Primary Endpoints

Primary Part 1 Biodistribution of 64Cu-LNTH-1363S
During serial PET/CT scans taken on Day 1 at the following timepoints at 0.5 hour ± 10 minutes, 1 hour ±10 minutes, 2 hours ± 15 minutes, 4 to 6 hours, and 24 hours ± 4 hours post study intervention administration.

Time Activity Curves (TACs) describing percentage of the injected activity versus time will be derived for selected organs and tumor lesions and absorbed radiation doses of 64Cu-LNTH-1363S in critical organs (e.g., kidneys, liver) will be estimated.

Primary Part 1 - Optimal dose (radioactivity) and imaging time window of 64Cu-LNTH-1363S
During serial PET/CT scans taken on Day 1 at the following timepoints at 0.5 hour ± 10 minutes, 1 hour ±10 minutes, 2 hours ± 15 minutes, 4 to 6 hours, and 24 hours ± 4 hours post study intervention administration.

Optimal dose (radioactivity) and imaging time window will be determined by using image quality scores from blinded central reviews. Each patient will receive 8 ± 1 mCi of 64Cu-LNTH-1363S. The raw data of each patient PET scan will be re-processed using a computer program to simulate scans of the same patient with lower injected activities (6 mCi and 4 mCi).

Primary Part 2 - Correlation of 64Cu-LNTH-1363S biodistribution with Immunohistochemistry FAP expression
Post surgery tissue collection to end of study

Correlation of 64Cu-LNTH-1363S biodistribution with FAP expression by IHC (SUVmean and SUVmax vs IHC score) and compare to circulating FAP in blood as analyzed by ELISA method.

Secondary Endpoints

Secondary Parts 1 and 2 Safety and Tolerability
Part1: From IP administration until the Day 7 (± 1 day) telephone follow up. Part 2: From time of IP administration to until post-surgery IHC sample collection.
Secondary Part 1 FAP expression profile of 64Cu-LNTH-1363S in patients with sarcoma
From Day 1 until the end of the Scheduled Surgery: IHC sample collection
Secondary Part 1 and Part 2 Cardiac Safety
Continuous ECG monitoring at Visit 2
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeDIAGNOSTIC

Treatment Arms

ArmTypeDescription
Experimental Part 1EXPERIMENTAL6 patients will receive 8 ± 1 mCi (\~90 μg mass dose) of the 64Cu-LNTH-1363S on Day 1 in the Intervention Period (raw data of each patient PET scan will be re-processed using a computer program to simulate scans of the same patient with 6 mCi and 4 mCi 64Cu injected activities).
Experimental Part 2EXPERIMENTALFirst 6 evaluable patients will receive the optimal radioactivity determined in Part 1. The remaining 14 evaluable patients will receive either the optimal radioactivity determined in Part 1 (if the sum of the average image quality scores of the first 6 patients is higher or equal to 10.5), or 8 ± 1 mCi (if the sum of the average image quality scores of the first 6 patients is less than 10.5).

Interventions

NameTypeDescription
64Cu-LNTH-1363SCOMBINATION_PRODUCT64Cu-LNTH-1363S, is a highly selective, high affinity FAP inhibitor (FAPi) that is radiolabeled with Copper-64 (64Cu) for PET/CT Imaging,
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Eligibility Criteria

Age Range15 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites5

Inclusion Criteria: Part 1 Patients are eligible to be included in the study only if all of the following criteria apply: 1. Patient must be ≥ 15 years of age and must have provided written informed consent and assent, where applicable (by patient or legal guardian). Those aged ≥15 to \<18 years m...

Countries:United States
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Frequently asked questions about 64Cu-LNTH-1363S

What is 64Cu-LNTH-1363S used for?

64Cu-LNTH-1363S is an investigational small molecule being studied for use in metastatic sarcoma, as well as other gastrointestinal tract cancers including esophageal, gastric, pancreatic, and colorectal cancer. It is currently in Phase 1 clinical development and is not yet approved by the FDA.

What does 64Cu-LNTH-1363S target?

64Cu-LNTH-1363S targets FAP, or fibroblast activation protein, which is a molecular target expressed in certain tumors. By binding to FAP, the drug is designed to deliver a radioactive copper isotope (64Cu) to cancer cells, potentially enabling imaging or therapy in oncology applications.

Who makes 64Cu-LNTH-1363S?

64Cu-LNTH-1363S is being developed by Lantheus Holdings, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol LNTH. The company is conducting clinical trials to evaluate the drug's safety and efficacy in patients with sarcoma and gastrointestinal tract cancers.

What phase is 64Cu-LNTH-1363S in?

64Cu-LNTH-1363S is in Phase 1 clinical development. It is an investigational drug, meaning it has not been approved by the FDA and is still being studied in clinical trials to assess its safety, dosing, and potential effectiveness in treating metastatic sarcoma and other cancers.

What clinical trials is 64Cu-LNTH-1363S in?

64Cu-LNTH-1363S is being studied in a Phase 1 clinical trial registered as NCT06298916, titled '64Cu-LNTH-1363S in Patients With Sarcoma or Gastrointestinal Tract Cancer.' The trial is currently recruiting participants in the United States and aims to enroll 26 patients with metastatic sarcoma, esophageal, gastric, pancreatic, or colorectal cancer.