NCT04318561

Gallium-68 Labeled LM3 PET/CT in Neuroendocrine Tumors

A Prospective, Randomized, Double-blinded Study to Evaluate the Safety, Biodistribution, Dosimetry and Lesion Detection Ability of Gallium-68 Labeled LM3 for the Diagnostic Imaging of Metastatic, Well-differentiated Neuroendocrine Tumors Using PET/CT

• Status: Completed
• Phase: Phase 1 / Phase 2
• Study type: Interventional
• Enrollment: 40 (actual)
• Sponsor: Peking Union Medical College Hospital · Academic / Other
• Sex: All
• Age: 18 Years – 70 Years
• Healthy volunteers: Not accepted

Summary

LM3 is a novel somatostatin receptor antagonist, while Gallium-68 DOTATATE is a typical somatostatin receptor agonist, This study is to evaluate the safety, biodistribution, dosimetry, and lesion detection ability of Gallium-68 labeled somatostatin receptor antagonist LM3 for the diagnostic imaging of metastatic, well-differentiated neuroendocrine tumors using positron emission tomography / computed tomography (PET/CT). The results will be compared between antagonist Gallium-68 labeled LM3 and agonist Gallium-labeled DOTATATE in the same group of patients. It will also be compared between the two different antagonists, Gallium-68 DOTA-LM3 and Gallium-68 NODAGA-LM3, in two parallel-designed arms.

Detailed description

Patients with histologically confirmed metastatic, well-differentiated neuroendocrine tumors will be recruited in this study. All patients will be randomized into two groups: Gallium-68 NODAGA-LM3 group and Gallium-68 DOTA-LM3 group. The study will be divided into the following 2 parts: Part ONE, which will enroll 16 patients (8 in each group), focuses on the safety evaluation, biodistribution, and dosimetry. In Part A, patients will undergo serial whole-body PET/CT scans at multiple time points (5m, 10m, 20m, 40m, 1h, 2h) after administering 40ug/150-200MBq Gallium-68 NODAGA-LM3 or Gallium-68 DOTA-LM3 (according to their group). Part TWO, which will enroll 24 patients (12 in each group) and follows Part A study, focuses on lesion detection ability. In Part B, patients will undergo one whole-body PET/CT scan at 1 hour after administering 40ug/150-200MBq Gallium-68 NODAGA-LM3 or Gallium-68 DOTA-LM3 (according to their group). All patients need to do a Gallium-68 DOTATATE PET/CT scan (40ug/150-200MBq, 1h post-injection) for comparison on the next day.

Conditions

• Neuroendocrine Tumors

Interventions

Type	Name	Description
DIAGNOSTIC_TEST	Gallium-68 NODAGA-LM3 PET/CT	Twenty patients will take this intervention. They will be further divided into two sub-groups with the same interventional radiopharmaceutical (Gallium-68 NODAGA-LM3) but different scanning protocols (Protocol A and Protocol B). The first enrolled 8 patients will go with Protocol A, who will undergo serial whole-body PET/CT scans at multiple time points (5m, 10m, 20m, 40m, 1h, 2h) after administering 40ug/150-200MBq Gallium-68 NODAGA-LM3. Baseline safety assessment will be conducted right before the study. The following 12 patients will go with Protocol B, who will undergo a whole-body PET/CT scan at 1 hour after administering 40ug/150-200MBq Gallium-68 NODAGA-LM3.
DIAGNOSTIC_TEST	Gallium-68 DOTA-LM3 PET/CT	Twenty patients will take this intervention. They will be further divided into two sub-groups with the same intervention radiopharmaceutical (Gallium-68 DOTA-LM3) but different scanning protocols (Protocol C and Protocol D). The first enrolled 8 patients will go with Protocol C, who will undergo serial whole-body PET/CT scans at multiple time points (5m, 10m, 20m, 40m, 1h, 2h) after administering 40ug/150-200MBq Gallium-68 DOTA-LM3. Baseline safety assessment will be conducted right before the study. The following 12 patients will go with Protocol D, who will undergo a whole-body PET/CT scan at 1 hour after administering 40ug/150-200MBq Gallium-68 DOTA-LM3.
DIAGNOSTIC_TEST	Gallium-68 DOTATATE PET/CT	All patients have to do a Gallium-68 DOTATATE PET/CT scan (40ug/150-200MBq, 1h post-injection) for comparison on the next day of LM3 scan. Safety assessment and tolerability of the previous LM3 study will be conducted right before the study.

Timeline

• Start date: 2019-12-01
• Primary completion: 2021-12-01
• Completion: 2021-12-01
• First posted: 2020-03-24
• Last updated: 2021-12-21

Locations

1 site across 1 country: China