Multi-b-value diffusion stretched-exponential model parameters correlate with MIB-1 and CD34 expression in Glioma...

Area of Science:

• Radiology
• Neuro-oncology
• Medical Imaging

Background:

• Gliomas require accurate histological grading for effective treatment.
• Multi-b-value diffusion-weighted imaging (MDWI) with the stretched-exponential model (SEM) offers promising biomarkers.
• SEM parameters, including diffusion distribution index (DDC) and α, show potential in assessing glioma characteristics.

Purpose of the Study:

• To investigate the pathological correlations of MDWI-SEM parameters (DDC and α) in glioma patients.
• To evaluate the utility of SEM parameters as biomarkers for glioma grading.
• To correlate SEM parameters with MIB-1 expression and CD34-MVD.

Main Methods:

• MDWI-SEM parametric mapping (DDC and α) was performed using b-values up to 1500 and 5000 sec/mm².
• Parameters were correlated with pathological indices from biopsy specimens (MIB-1 and CD34-MVD).
• Spearman's correlation analysis was used to assess relationships with pathological indices and WHO grades.

Main Results:

• MDWI-derived α negatively correlated with CD34-MVD in both low-grade glioma (LGG) and high-grade glioma (HGG).
• MDWI-derived DDC negatively correlated with MIB-1 expression across all glioma patients.
• WHO grades showed negative correlations with α parameters (α1500 and α5000).

Conclusions:

• SEM-derived DDC and α are significant in the histological grading of gliomas.
• DDC may indicate glioma proliferative ability.
• Microvascular perfusion (CD34-MVD) may influence water diffusion inhomogeneity (α) in gliomas.