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Author Spotlight: Exploring Advanced Therapeutic Targets in Osteosarcoma Through Spatial Transcriptomics
Published on: May 3, 2024
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Immuno-genomic landscape of osteosarcoma
Chia-Chin Wu1, Hannah C Beird1, J Andrew Livingston2,3
1Department of Genomic Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
Nature Communications
|February 22, 2020
Summary
Osteosarcoma (OS) shows limited response to immune checkpoint inhibitors (ICI). Research reveals low immune cell infiltration and neoantigen expression, suggesting immune evasion mechanisms and potential for novel immunotherapies in OS patients.
Area of Science:
- Oncology
- Immunology
- Genomics
Background:
- Osteosarcoma (OS) exhibits limited clinical activity with immune checkpoint inhibitors (ICI).
- Understanding the tumor microenvironment's immunogenic potential is crucial for improving OS treatment outcomes.
Purpose of the Study:
- To investigate the immunogenic landscape of osteosarcoma.
- To identify factors contributing to the lack of response to ICI in OS patients.
Main Methods:
- Whole genome, RNA, and T-cell receptor sequencing on 48 OS specimens.
- Immunohistochemistry and reverse phase protein array (RPPA) profiling.
- Analysis of primary, relapsed, and metastatic OS samples from pediatric and adult patients.
Main Results:
- Osteosarcoma displayed lower immune infiltrate and T-cell receptor clonalities compared to ICI-responsive tumors.
- Neoantigen expression was notably absent and linked to nonsense-mediated decay (NMD).
- Low immune infiltrate correlated with gene deletions, while high infiltrate was associated with adaptive resistance pathways and lower PARP2 expression.
Conclusions:
- Osteosarcoma possesses multiple immunosuppressive features hindering ICI efficacy.
- Identifying these immune-evasive mechanisms suggests potential immunotherapeutic strategies for OS treatment.
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