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[

Narinée Hovhannisyan1, Fabien Fillesoye1, Stéphane Guillouet1

  • 1Normandie Univ, UNICAEN, CEA, CNRS, CHU Caen, ISTCT/LDM-TEP group, GIP Cyceron, Caen, France.

Theranostics
|September 15, 2018
PubMed
Summary
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[18F]fludarabine (FDB) positron emission tomography (PET) shows higher specificity for differentiating central nervous system lymphoma (CNSL) from glioblastoma (GBM) compared to [18F]fluorodeoxyglucose (FDG). This novel PET imaging approach offers improved tumor definition over MRI.

Area of Science:

  • Neuro-oncology
  • Nuclear Medicine
  • Radiochemistry

Background:

  • Differentiating central nervous system lymphoma (CNSL) from glioblastoma (GBM) is critical for patient management.
  • Current diagnostic methods can be limited in specificity.
  • Novel imaging tracers are needed for improved diagnostic accuracy.

Purpose of the Study:

  • To evaluate the efficacy of [18F]fludarabine ([18F]FDB) positron emission tomography (PET) in distinguishing CNSL from GBM.
  • To compare the diagnostic performance of [18F]FDB-PET with [18F]fluorodeoxyglucose ([18F]FDG)-PET, MRI, and histology.

Main Methods:

  • Animal models of CNSL (lymphoma cells) and GBM (glioma cells) were established in nude rats.
  • Tumor growth and blood-brain barrier permeability were assessed using MRI.
Keywords:
CNS lymphoma[18F]FDG[18F]fludarabine-PETdifferential diagnosisglioblastoma

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  • [18F]FDB and [18F]FDG PET imaging were performed, followed by quantitative analysis of tracer uptake (tumor-to-background ratio).
  • Histological analysis was used for comparative tumor characterization.

    • Main Results:

    • [18F]FDB-PET demonstrated significantly higher tracer accumulation in CNSL compared to GBM.
    • [18F]FDG-PET showed overlapping uptake patterns between CNSL and GBM.
    • Tumor-to-background ratios for [18F]FDB were significantly different between the lymphoma and glioblastoma models (p < 0.01).
    • [18F]FDB-PET provided a more precise definition of tumor volume than contrast-enhanced MRI.

    Conclusions:

    • [18F]FDB-PET exhibits superior specificity for CNSL detection compared to [18F]FDG-PET.
    • This tracer holds significant potential for differentiating CNSL from GBM.
    • Further investigation in human patients is warranted to confirm these findings.