Local Glioma Cells Are Associated with Vascular Dysregulation

Area of Science:

• Neuro-oncology
• Neuroimaging
• Vascular Biology

Background:

• Malignant glioma causes cerebrovascular disruptions, but the mechanisms of vascular dysfunction detected by resting-state fMRI are unclear.
• Understanding these mechanisms is crucial for developing targeted therapies.

Purpose of the Study:

• To characterize histopathologic alterations correlating with blood oxygen level-dependent (BOLD) imaging biomarkers of vascular dysregulation in malignant glioma.
• To investigate the relationship between BOLD signal abnormalities and specific tumor characteristics.

Main Methods:

• Stereotactically localized biopsies from contrast-enhancing and nonenhancing regions of malignant gliomas in 17 patients.
• Preoperative resting-state fMRI to assess BOLD signal intensity.
• Comparison of BOLD signal with tumor infiltration, microvascular proliferation, total cell density, and neuronal labeling index.

Main Results:

• BOLD signal abnormality showed significant correlations with total cell density (P=.013, R²=0.19) and neuronal labeling index (P=.016, R²=0.21).
• BOLD signal abnormality was also significantly related to tumor infiltration (P=.014) and microvascular proliferation (P=.045).

Conclusions:

• Local neoplastic characteristics, including glioma cell infiltration and microvascular proliferation, are associated with BOLD signal abnormalities.
• These findings suggest that local glioma cell infiltration contributes to observed vascular dysregulation.