POSitron Emission Imaging Using 18F-FDOPA in Neurooncology (POSEIDON)

April 20, 2026 updated by: Centre Antoine Lacassagne

Study of the Impact of 18F-FDOPA Positon Emission Tomography on Therapeutic Proposals Made at Neurooncology Multidisciplinary Case Conferences

18F-FDOPA PET is expensive. It is mandatory therefore to assess its impact on the management of patients with high-grade gliomas in order to provide medico-economic justification for its use. The article by the UCLA group showed that 18F-FDOPA modified 41% of management decisions for patients with brain tumors (Walter JNM 2012). However, this study comprised 58 patients, combined primary and recurring tumors, and was based on questionnaires sent out to referring physicians. A targeted study is needed, therefore, to make a prospective multicenter assessment of the contribution of this technique in the context of high-grade glial tumors and neurooncology MCCs.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Current treatment of high-grade glioma combining surgery, radiotherapy and chemotherapy has enhanced overall survival during the past 10 years, notably thanks to the " Stupp " protocol using Temozolomide. At tumor evaluation and post-treatment follow-up, decisions regarding management (change, discontinuation or continuation of treatment) are discussed during multidisciplinary case conferences (MCC) between neurooncology specialists and are generally based primarily on MRI data. New treatment strategies are more effective on tumor tissue but also affect the adjacent healthy tissue. These phenomena give rise to complex MRI changes which can make it more difficult to perform differential diagnoses between tumor recurrence and treatment sequellae, such as radionecrosis and pseudoprogression. Alternatively, they can conceal effective tumor progression (appearance of pseudoresponse under antiangiogenics). Classical MRI interpretation criteria have evolved to take these phenomena into account (RANO criteria) and are now supplemented by new MRI data (perfusion and diffusion imaging, spectroscopy). Nonetheless, cases involving an uncertain recurrence diagnosis are still frequent. PET imaging has also shown very good results in differential diagnosis between posttreatment changes. Fluorodeoxyglucose-18-F (18FDG) can be used for glioma follow-up (Varrone EJNMMI 2009) but produces false positives during follow-up. In this setting, over-expression of amino acid transporter LAT-1 in brain tumors makes amino acids or marked analogs more suitable for PET imaging of glial tumors. C-11 methionine and 18F-FET can be used, but 18F-FDOPA is currently the only radiopharmaceutical agent to have received marketing authorization in France. Recently, the UCLA group demonstrated that 18F-FDOPA could modify the intended management of 41% of patients with brain tumors . The present projects aims to assess the impact of 18F-FDOPA PET imaging on decisions taken by neurooncology MCCs for the management of patients already treated for high-grade gliomas.

Expected benefits for patients and in terms of Public Health High-grade gliomas are the commonest and most aggressive brain tumors. Current therapy combining several treatments (surgery, radiotherapy, radiosurgery and chemotherapy) has improved overall patient survival during the past 10 years. Nevertheless, tumor recurrence accounts for a median survival of approximately only 15 months.

Study Type

Interventional

Enrollment (Actual)

110

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • France
      • Nice, France, 06000
        • Centre Antoine Lacassagne

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Patient diagnosed with high-grade glioma
  • Patient whose file has been submitted to the neurooncology MCC for follow-up after initial treatment and for whom there is a diagnostic doubt
  • Age > 18 years
  • Patient has been informed and has signed informed consent for the study

Exclusion Criteria:

  • Patient presenting comorbidities or allergies on account of which MRI or 18F-FDOPA PET would be contraindicated.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Diagnostic
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Other: device 18FDOPA
impact of device 18F-FDOPA PET on treatment decisions
Other: impact of device 18F-FDOPA PET on treatment decisions
Imagery device: impact of 18F-FDOPA PET imaging on treatment decisions for patients with high-grade gliomas with an uncertain diagnosis.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
percentage of modified therapeutic decisions connected to the data supplied by 18F-FDOPA PET
Time Frame: up to 3 years
up to 3 years

Secondary Outcome Measures

Outcome Measure
Time Frame
Percentage of variation in the confidence level of diagnosis incorporating 18F-FDOPA PET findings (reduced, unchanged, increased).
Time Frame: up to 3 years
up to 3 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Centre Antoine Lacassagne

Investigators

  • Study Director: Jacques DARCOURT, PHD, Centre Antoine Lacassagne

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

December 1, 2015

Primary Completion (Actual)

June 1, 2020

Study Completion (Actual)

June 1, 2020

Study Registration Dates

First Submitted

December 5, 2015

First Submitted That Met QC Criteria

December 12, 2015

First Posted (Estimated)

December 16, 2015

Study Record Updates

Last Update Posted (Actual)

April 23, 2026

Last Update Submitted That Met QC Criteria

April 20, 2026

Last Verified

April 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2014/60

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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