Glioblastoma Metastasis and Treatment Strategies

Glioblastoma is the most aggressive primary brain tumour in adults, characterised by diffuse infiltration of neural tissue and a propensity for local recurrence. Although true extracranial metastases are rare, dissemination within the central nervous system via cerebrospinal fluid pathways—termed leptomeningeal metastasis—is increasingly recognised as a major contributor to clinical deterioration. Key drivers include alterations in cell–matrix adhesion, activation of motility programmes and remodelling of the tumour microenvironment, which collectively facilitate perivascular and perineuronal spread. Standard treatment combines maximal safe surgical resection, radiotherapy and alkylating-agent chemotherapy, but these interventions seldom prevent recurrence. Recent strategies aim to disrupt invasive signalling axes, target cancer stem-like cells and modulate host immunity. Anti-angiogenic approaches, blood–brain barrier modulation, neural interface technologies and extracellular vesicle inhibitors have all entered early clinical evaluation. A multidisciplinary approach, balancing extent of resection with functional preservation and integrating emerging targeted agents, is essential to improve symptom control and extend survival in this uniformly fatal disease.

Research from Nature Portfolio

Recent studies have identified surgical technique as a determinant of leptomeningeal dissemination. Analysis of high-grade glioma cohorts revealed that intraoperative entry into the ventricular system markedly increases the risk of tumour cell seeding along cerebrospinal fluid pathways. Patients who avoid ventricular entry during resection demonstrate a significantly lower incidence of symptomatic leptomeningeal spread and enjoy longer survival intervals. This work has prompted neurosurgical teams to refine resection corridors, employing image guidance and intraoperative mapping to maximise tumour removal while preserving ventricular integrity. In parallel, molecular profiling of disseminated cells has begun to uncover distinct expression patterns that may inform future adjuvant therapies aimed at eradicating microscopic leptomeningeal disease.

Glioblastoma Metastasis and Treatment Strategies publication trend

The graph below shows the total number of articles in glioblastoma metastasis and treatment strategies across all publications each year (not limited to Nature Index journals).

Technical terms

Leptomeningeal metastasis: Dissemination of tumour cells to the pia and arachnoid mater of the central nervous system, leading to widespread seeding along cerebrospinal fluid pathways.

Exosomes: Small extracellular vesicles released by cells that carry proteins, lipids and nucleic acids, implicated in intercellular communication and the promotion of tumour invasion.

Ventricular entry: Inadvertent or planned opening of the brain’s ventricular system during surgical resection, which can facilitate the dissemination of tumour cells into cerebrospinal fluid.

Anti-angiogenic therapy: Treatment that inhibits new blood vessel formation within tumours, aiming to restrict their growth and reduce the potential for metastatic spread.

References

1. Migration/Invasion of Malignant Gliomas and Implications for Therapeutic Treatment. International Journal of Molecular Sciences (2018).
2. Leptomeningeal Metastases in High-Grade Adult Glioma: Development, Diagnosis, Management, and Outcomes in a Series of 34 Patients. Frontiers in Neurology (2014).
3. Surgical Ventricular Entry is a Key Risk Factor for Leptomeningeal Metastasis of High Grade Gliomas. Scientific Reports (2015).
4. Ventricular entry during surgical resection is associated with intracranial leptomeningeal dissemination in glioblastoma patients. Journal of Neuro-Oncology (2022).
5. Addition of Anti-Angiogenetic Therapy with Bevacizumab to Chemo- and Radiotherapy for Leptomeningeal Metastases in Primary Brain Tumors. PLOS ONE (2016).