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A Histopathologic Correlation Study Evaluating Glymphatic Function in Brain Tumors by Multiparametric MRI.

Min Gao1, Zhengliang Liu2, Hongjing Zang3

  • 1Department of Radiology, The Second Xiangya Hospital of Central South University, Changsha, China.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|June 7, 2024
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Summary

Brain tumors impair glymphatic function and increase fluid buildup, as shown by reduced DTI-ALPS index in patients. Aquaporin-4 (AQP4) levels correlate with edema, impacting brain fluid dynamics.

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Area of Science:

  • Neuroimaging
  • Neurosurgery
  • Oncology

Background:

  • Brain tumors significantly affect brain function and physiology.
  • Cerebral edema and impaired glymphatic drainage are common complications.
  • Understanding the relationship between tumor characteristics, glymphatic function, and edema is crucial.

Purpose of the Study:

  • To investigate the impact of brain tumors on cerebral edema and glymphatic drainage.
  • To explore correlations between tumor characteristics, glymphatic function (assessed by DTI-ALPS), and aquaporin-4 (AQP4) expression.
  • To leverage advanced MRI techniques for quantitative brain mapping.

Main Methods:

  • Prospective cohort study including patients with glioblastoma, brain metastases, aggressive meningiomas, and healthy controls.
  • Utilized 3.0T MRI, including diffusion tensor imaging analysis along the perivascular space (DTI-ALPS) and multiparametric MRI.
  • Analyzed tumor and peritumor tissues for AQP4 expression via immunofluorescence.

Main Results:

  • Patients with brain tumors showed significantly reduced glymphatic function (lower DTI-ALPS index) and increased cerebrospinal fluid volume compared to controls.
  • A negative correlation was found between tumor volume and the DTI-ALPS index.
  • AQP4 expression levels positively correlated with peritumoral brain edema volume.

Conclusions:

  • Brain tumors disrupt glymphatic function and alter fluid dynamics, contributing to cerebral edema.
  • DTI-ALPS and multiparametric MRI are valuable tools for assessing tumor-related pathophysiology.
  • Findings provide a radiological basis for further neuro-oncological research on the glymphatic system.