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A Unified Methodological Framework for Vestibular Schwannoma Research
Published on: June 20, 2017
B7-H1 expression in vestibular schwannomas.
David J Archibald1, Brian A Neff, Stephen G Voss
1Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic School of Medicine, Rochester, Minnesota 55905, USA.
Summary
Vestibular schwannomas express B7-H1, a molecule linked to immune tolerance. Tumors with higher B7-H1 expression showed poorer outcomes after radiation therapy, suggesting a role in tumor growth.
Area of Science:
- Neuro-oncology
- Immunology
- Molecular Biology
Background:
- Vestibular schwannomas are benign tumors with poorly understood immune interactions.
- Aberrant expression of B7 homolog 1 (B7-H1), a T-cell coregulatory molecule, is investigated in these tumors.
- The study explores B7-H1's implications for tumor aggressiveness and regulation.
Purpose of the Study:
- To investigate the expression of B7-H1 in vestibular schwannomas.
- To correlate B7-H1 expression with tumor aggressiveness and treatment outcomes.
- To explore the role of microRNA-513 in regulating B7-H1 expression.
Main Methods:
- Immunohistochemical staining for B7-H1 and tumor-infiltrating lymphocytes (CD8+, CD3+, CD4+) in 48 vestibular schwannoma samples.
- Clinical review of patient symptoms and tumor characteristics.
- Real-time polymerase chain reaction to assess B7-H1 messenger RNA and microRNA-513 expression.
Main Results:
- B7-H1 expression varied, with 33% of tumors showing strong positivity.
- Strong B7-H1 expression was associated with significantly greater failure of tumor control after stereotactic radiation (p=0.029).
- No significant differential expression of B7-H1 messenger RNA or microRNA-513 was found between tumors with strong and negative B7-H1 staining.
Conclusions:
- Vestibular schwannomas express B7-H1, a molecule associated with immune tolerance and adverse outcomes in other cancers.
- Strong B7-H1 expression in tumors treated with radiation suggests a potential role in immuno-evasion and tumor growth.
- Further studies are needed to confirm the correlation between B7-H1 and tumor aggressiveness, and B7-H1 regulation appears post-transcriptional, not mediated by microRNA-513.
