Whole Body Dynamic 68Ga-DOTATOC PET/CT in Neuroendocrine Tumors (GAPET-NET)
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|ClinicalTrials.gov Identifier: NCT03576040|
Recruitment Status : Recruiting
First Posted : July 3, 2018
Last Update Posted : July 18, 2019
Neuroendocrine tumors (NET) are a network of rare tumors with common embryological origin. Functional imaging plays a major role in the extension assessment and tumor characterization of NETs. SPECT/CT with 111In-pentetreotide is the recommended test when tumors are well differentiated (grade G1 or G2). It has a real interest in diagnosis, in therapeutic decision-making (in particular by cold somatostatin analogues or in PRRT) and in the systematic follow-up of patients. Nevertheless, SPECT/CT procedure makes for a relatively long review. In addition, scintigraphy has a lower spatial resolution than PET technology and remains of limited interest for signal quantification.
However, the ability to locate and quantitatively measure the absorption of radiopharmaceuticals in the target tissues is a major challenge in oncology for the characterization of the disease.
Recent developments in radiopharmacy have made it possible to target NETs in PET imaging through the use of somatostatin analogues coupled with positron emitters, called 68Ga-DOTA peptides. The diagnostic performance of 68Ga-DOTApeptide PET/CT appears to be superior to SPECT/CT with 111In-pentetreotide. A marketing authorization has thus recently been issued in France for the use of 68Ga-DOTATOC.
Historically, the recommended quantification method in PET was based on the instantaneous measurement in static acquisition (3D) of the maximum of the standardized uptake value (SUVmax). This approach has the disadvantage to measure the signal at a time "t" for a single voxel of the image. Dynamic acquisition methods (4D) have been proposed to extract a radiotracer absorption coefficient (Ki) for a lesion. Several studies have demonstrated the superiority of Ki versus SUVmax in 18FDG PET/CT for the diagnostic management, therapeutic evaluation and prognosis of various solid cancers.
However, no work has validated this approach in PET / CT at 68Ga-DOTATOC as part of the prognostic evaluation of NETs.
The objective of the study is to evaluate the prognostic value of the tumor absorption coefficient Ki resulting from a 4D whole-body dynamic acquisition in PET / CT at 68Ga-DOTATOC in patients with well-differentiated NETs grade I or II according to the WHO classification
|Condition or disease||Intervention/treatment|
|Neuroendocrine Tumors||Device: Whole Body Dynamic 68Ga-DOTATOC PET/CT|
|Study Type :||Observational|
|Estimated Enrollment :||120 participants|
|Official Title:||Prognostic Interest of a Whole Body Dynamic PET Acquisition in Pre-therapeutic 68Ga-DOTATOC PET/CT for Neuroendocrine Tumors|
|Actual Study Start Date :||July 19, 2018|
|Estimated Primary Completion Date :||July 2023|
|Estimated Study Completion Date :||July 2023|
- Device: Whole Body Dynamic 68Ga-DOTATOC PET/CT
68Ga-DOTATOC PET-CT will be performed in the nuclear medicine department of the University Hospital of Brest on a Biograph mCT S64 machine (Siemens medical, Erlangen, Germany) "Time of Flight" system after intravenous injection of 150MBq of 68Ga-DOTATOC. In the usual conditions for performing this exam, the patient must remain at a strict rest for 60 minutes following the injection of the tracer and before a static 3D acquisition. For this protocol, a complementary 4D dynamic acquisition (15-60 minutes post-injection) will be performed during this usual rest period.
- Progression free survival (PFS) [ Time Frame: 2 years ]To evaluate the prognostic value of lesionnal Ki on progression-free survival at 2 years and compare it with SUVmax (static 3D acquisition) in patients with metastatic well-differentiated NET
- Recidive free survival (RFS) [ Time Frame: 2 years ]To evaluate the prognostic value of Ki lesion on progression-free survival at 2 years and compare it with SUVmax (static 3D acquisition) in patients with localised well-differentiated NET
- Correlation between lesionnal Ki and immunochemistry markers [ Time Frame: 0 to 2 years ]Evaluate the statistical correlation between lesional Ki versus SUVmax with NET immunohistochemistry markers expression (SSTR2, SSTR3, and SSTR5; BCL2, Phospho-MTOR expression PD-L1 by tumor cells and immune cells, intra-tumor CD8 + lymphocytes, tumor necrosis surface)
- Predictive value of non-event survival (PFS+RFS) [ Time Frame: 6 months to 2 years ]To evaluate the predictive value of non-event survival (PFS+RFS) with a ΔKi approach in patients receiving an intermediate therapeutic assessment examination (somatostatin analogues or PRRT with 177Lu-DOTATATE), and compare it with a ΔSUVmax approach
- Correlation between 68Ga-DOTATOC PET/CT and/or 111In-pentetréotide SPECT/CT and 177Lu-DOTATATE SPECT/CT [ Time Frame: 0 to 2 years ]Evaluate the statistical correlation between the SUVmax assessed with 68Ga-DOTATOC PET/CT and/or 111In-pentetréotide SPECT/CT and 177Lu-DOTATATE SPECT/CT
- Prognostic value of Ki versus usual prognostic parameters [ Time Frame: 2 years ]To evaluate the prognostic value on non-event survival (PFS+RFS) at 2 years of Ki and clinical parameters (sex, age), biological (CgA assay), pathology (grade, differentiation, Ki67 expression, BCL2, phospho-MTOR).
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03576040
|Contact: Philippe Thuillierfirstname.lastname@example.org|
|Contact: Ronan Abgral|
|CHRU de Brest||Recruiting|
|Brest, France, 29609|
|Contact: Philippe Thuillier 02-98-34-71-19|