Symptoms and General Pathology

All Conditions

Neoplasms

Rare Diseases

Hypoxia

Glioma

Neoplasms, Neuroepithelial

Neuroectodermal Tumors

Neuroectodermal Tumors, Primitive

Neoplasms, Germ Cell and Embryonal

Neoplasms by Histologic Type

Neoplasms, Glandular and Epithelial

Neoplasms, Nerve Tissue

Signs and Symptoms, Respiratory

Neuroepithelioma

Calculation of the oxygen saturation map of gliomas cases

MRI Oxygen Saturation Map

David Hassanein BERRO, MD

The imaging of cerebral oxygenation is an extremely important tool in understanding the pathophysiology of the tumor and for adaptation of therapies according to hypoxia. Currently, imaging of cerebral oxygenation is mainly performed by the use of Positron Emission Tomography (PET). Thus, the investigators have been able to show that the FMISO radiotracer can reveal tumor hypoxia (HypOnco study, promotor: Caen University Hospital, main investigator: J.S. Guillamo). After injection of the radiotracer, increased uptake is observed in the regions for which the tissue oxygen pressure is less than 10 mmHg (the healthy brain with a tissue oxygen pressure (ptO2) ≈ 40mmHg).

Although PET is a reference methodology, it is not widely practiced mainly because of radioactive sources. Magnetic Resonance Imaging (MRI) would bypass the previously mentioned PET limitations. The investigators have recently shown that a measure of local oxygen saturation could be obtained by MRI.

This methodology has also been implemented at a clinical scale on lower field MRI magnets, but its formal validation in a clinical situation remains to be demonstrated with respect to FMISO.

The major advantage of this methodology is that MRI is already performed in routine practice for patients. Measuring tissue oxygenation with MRI (SatO2-MRI) would not add additional examination for the patient. In addition, MRI is a non-ionizing methodology with a very good spatial resolution compared to PET, this should help to better understand intratumoral heterogeneity. Similarly, in preclinical studies, the investigators have shown in a context of mild hypoxia that SatO2-MRI may be more sensitive than PET.

The investigators propose a study to compare in patients with glial tumors, images obtained by 3 Tesla MRI of SatO2-MRI to the hypoxia maps obtained by FMISO PET. These imaging studies will be confronted with studies carried out in immunohistochemistry on biopsies / resection allowing to reveal and to quantify by image analysis the expression of the factors induced by hypoxia (HIF1, HIF2).

This study should include 20 patients with glioma (15 high-grade patients and 5 low-grade patients) in pre-surgery. The aim is to show that SatO2-MRI is a relevant methodology (in terms of sensitivity, specificity) for assessing intratumoral oxygenation in a context of brain tumors. This fits perfectly into an era of personalized medicine where functional imaging finds its meaning.

Multimodal Imaging of Hypoxia in Gliomas

Validation of SatO2-MRI as a reliable imaging method to detect hypoxic regions, in comparison with FMISO PET. This will mainly be done by measuring spatial correlation of hypoxic regions obtained by the two imaging modalities.

To correlate imaging biomarkers with more conventional approaches on tissue slices (immunohistochemistry HIF1 / HIF2 / CD34)

University Hospital, Caen

Study title	NCT ID	Conditions	Interventions	Eligibility	Organization	Link
Multimodal Imaging of Hypoxia in Gliomas	NCT03716986	Glioma	MRI Oxygen Satu...	18 Years -	University Hospital, Caen
Multimodal Imaging of Hypoxia in Gliomas	NCT03716986	Glioma	MRI Oxygen Satu...	18 Years -	University Hospital, Caen

Spots Global Cancer Trial Database for o2 saturation