Combining 3′-Deoxy-3′-[18F] fluorothymidine and MRI increases the sensitivity of glioma volume detection

Philippe Fernandez, Paolo Zanotti-Fregonara, Sandrine Eimer, Edouard Gimbert, Pascal Monteil, Guillaume Penchet, Frédéric Lamare, Paul Perez, Delphine Vimont, Sylvain Ledure, Thomas Tourdias, Hugues Loiseau

Research output: Contribution to journalArticle

Abstract

Objective 3′-Deoxy-3′-[18F] fluorothymidine (18F-FLT) is a marker of cell proliferation and displays a high tumor-to-background ratio in brain tumor lesions. We determined whether combining 18F-FLT PET and MRI study improves the detection of tumoral tissue compared to MRI alone and whether 18F-FLT uptake has a prognostic value by studying its association with histopathological features. Methods Thirteen patients with a supratentorial malignant glioma were recruited and scheduled for surgery. The tumor volume was defined in all patients on both 18F-FLT PET and MRI images. The images were coregistered and uploaded onto a neuronavigation system. During surgery, an average of 11 biopsies per patient were taken in regions of the brain that were positive to one or both imaging modalities, as well as from control peritumoral regions. The standardized uptake values (SUVs) of each biopsy region were correlated to histopathological data (i.e., proliferation index and number of mitoses) and the SUV values of high and low-grade samples were compared. Results Out of a total of 149 biopsies, 109 contained tumoral tissue at histopathological analysis. The positive predictive value was 93.1% for MRI alone and 78.3% for MRI and PET combined. In addition, 40% of the biopsy samples taken from areas of the brain that were negative at both PET and MRI had evidence of malignancy at pathology. The SUV values were not significantly correlated to either the proliferation index or the number of mitoses, and could not differentiate between high- and low-grade samples. Conclusion In patients with newly diagnosed glioma, a combination of MRI and 18F-FLT-PET detects additional tumoral tissue and this may lead to a more complete surgical resection. Also, the addition of a negative PET to a negative MRI increases the negative predictive value. However, 18F-FLT still underestimated the margins of the lesion and did not correlate with histopathological features.

Original languageEnglish (US)
Pages (from-to)1066-1071
Number of pages6
JournalNuclear medicine communications
Volume40
Issue number10
DOIs
StatePublished - Oct 1 2019

Keywords

  • 3′-Deoxy-3′-[18F] fluorothymidine
  • MRI
  • PET
  • glioma

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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