Clinical Scorecard: Mechanical Properties of Glioblastoma and Adjacent Non-Tumor Human Brain Tissue
At a Glance
Category
Detail
Condition
Glioblastoma multiforme (GBM), a highly malignant primary brain tumor
Key Mechanisms
Tumor tissue exhibits altered mechanical properties such as increased stiffness and distinct stress-relaxation behavior compared to non-tumorous brain tissue
Target Population
Adult patients (>18 years) with supratentorial GBM in non-eloquent brain areas undergoing surgical resection
Care Setting
Neurosurgical operating room during tumor resection procedures
Key Highlights
GBM is highly invasive and fast-growing, requiring multimodal treatment including microsurgical resection, radiotherapy, and chemotherapy.
Mechanical properties like elasticity and stress-relaxation behavior can help differentiate GBM tissue from healthy brain tissue intraoperatively.
Fresh tumor and adjacent non-tumorous brain tissue samples were mechanically tested immediately after resection using indentation to assess viscoelastic properties.
Guideline-Based Recommendations
Diagnosis
Use histopathological examination to confirm tumor presence (>60% tumor cells) in resected tissue samples.
Employ intraoperative tools such as neuro-navigation, fluorescent dyes, and advanced imaging to assist in tumor delineation.
Consider mechanical property assessment as an adjunct to distinguish tumor from healthy tissue during surgery.
Management
Aim for gross-total or supramarginal resection of GBM while preserving eloquent brain areas.
Incorporate multimodal treatment including microsurgery, radiotherapy, chemotherapy, and potentially tumor treating fields or immunotherapy.
Use tactile feedback and mechanical property data to guide extent of resection.
Monitoring & Follow-up
Perform close-meshed complication screening postoperatively as part of standard care.
Follow up patients according to international neurosurgical guidelines.
Risks
Potential difficulty in distinguishing GBM from healthy brain tissue intraoperatively may affect resection radicality and patient outcomes.
Sampling non-tumorous tissue only from non-eloquent areas to minimize neurological risk.
No complications attributable to study-related mechanical testing procedures were observed.
Patient & Prescribing Data
19 adult patients with newly diagnosed or recurrent supratentorial GBM in non-eloquent areas
All recurrent GBM patients had prior chemo- and radiotherapy; mechanical testing was integrated into standard surgical care without additional complications.
Clinical Best Practices
Collect fresh tumor and adjacent non-tumorous brain tissue samples intraoperatively for immediate mechanical testing to avoid desiccation artifacts.
Use indentation testing with a standardized device and protocol to quantify tissue elasticity and stress-relaxation behavior.
Combine mechanical property data with conventional intraoperative imaging and tactile feedback to improve tumor boundary identification.
Exclude samples with mixed tumor cell content (<60%) to ensure accurate mechanical characterization.
Ensure ethical approval and informed consent when integrating experimental measurements into clinical practice.
by Jessica Kren, Isabelle Skambath, Patrick Kuppler, Steffen Buschschlüter, Nicolas Detrez, Sazgar Burhan, Robert Huber, Ralf Brinkmann, Matteo Mario Bonsanto
