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On-line flow cytometry for real-time surgical guidance
Ali H Mesiwala1, Louis D Scampavia, Peter S Rabinovitch
1Department of Neurological Surgery, University of Washington, Seattle, Washington, USA.
Neurosurgery
|September 1, 2004
Summary
Intraoperative analysis of brain tumor tissue using DNA content measurement is feasible. This method can identify residual tumor in surgical margins, aiding neurosurgeons in real-time decision-making during resections.
Area of Science:
- Neuro-oncology
- Surgical Pathology
- Biomedical Engineering
Background:
- Surgical resection of brain tumors requires accurate margin assessment.
- Intraoperative analysis of tissue can guide surgical decisions.
- Current methods for margin assessment may lack real-time feedback.
Purpose of the Study:
- To test the feasibility of on-line analysis of brain tumor tissue during surgery.
- To provide biologically relevant information in a clinically relevant time frame.
- To augment surgical decision-making using deoxyribonucleic acid (DNA) content analysis.
Main Methods:
- Interfacing an ultrasonic aspiration (USA) system with a flow cytometer (FC) for DNA content analysis (DNA-FC).
- Determining system design, tissue preparation, and time requirements using beef brain tissue.
- Comparing DNA-FC measurements in nonneoplastic brain samples with glioma patient samples from tumor regions and surgical margins.
Main Results:
- Modern FC systems can perform real-time, intraoperative analysis of USA specimens.
- Total on-line analysis time ranges from 36 to 63 seconds.
- 50% of samples from macroscopically normal glioma surgical margins showed DNA-FC abnormalities, indicating potential residual tumor.
Conclusions:
- DNA content analysis of brain tissue is feasible in a clinically relevant timeframe using existing technologies.
- On-line DNA-FC analysis can identify abnormalities in surgical margins, guiding resection.
- This technology offers neurosurgeons an objective, real-time method for intraoperative analysis.