Abstract
Background
Glioma is the prevailing malignant tumor affecting the brain and central nervous system, constituting over 80% of all malignant brain tumors. HOXD9 has been implicated in the development of glioma, but the specific mechanism of its influence on glioma pathogenesis remains incompletely understood. The purpose of this study was to investigate the role of HOXD9 in glioma and examine the changes in HOXD9 expression during the progression of glioma, thus contributing new insights into the pathogenesis of glioma.
Methods
Glioma samples from the Cancer Gene Atlas (TCGA) and Chinese Glioma Genome Atlas (CGGA) datasets were included in this study. Variations in HOXD9 expression in gliomas between different subgroups of multiple clinical characteristics were explored, and the expression was validated in glioma samples using qRT-PCR and western blotting. Next, the impact of HOXD9 on the prognosis of gliomas was explored by survival analysis, receiver operating characteristic curve, and nomogram plots. Subsequently, the association between HOXD9 and the tumor immune microenvironment was explored using the ssGSEA algorithm and the ESTIMATE algorithm. Then, immune-related pathways associated with HOXD9 were determined by differential express analysis and GSEA. Finally, HOXD9-related genomic alterations were identified.
Results
HOXD9 expression is upregulated and correlated with malignant properties in glioma. Similarly, our validation results showed significantly upregulated protein and mRNA levels of HOXD9 in glioma brain tissues. In addition, high HOXD9 expression was indicative of a poor prognosis for glioma patients. Additionally, elevated HOXD9 levels were associated with reduced tumor purity and higher levels of immune invasion. Finally, HOXD9 was significantly associated with genomic alterations.
Conclusion
Overall, this study has unveiled a significant association between HOXD9 and the prognosis and survival of glioma patients. Our findings highlight the potential of HOXD9 as a prognostic biomarker, implicating its role in influencing the glioma immune microenvironment.
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Availability of data and materials
The publicly available datasets used in this study can be found in the TCGA database (https://portal.gdc.cancer.gov/).
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Acknowledgements
We are grateful to the Bioinformatics Center, Xiangya Hospital, Central South University, for partial support of this work.
Funding
This research was funded by the Natural Science Foundation of Hunan Province (2022JJ80120).
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SX, TS, YZ and CW designed the study, analyzed the data and wrote the manuscript. HX and RG performed validation in human brain tissues. TC and ZH assisted in analyzing the data and revising the manuscript. DL and MJ critically read and edited the manuscript. All authors have read and approved the final manuscript.
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Xu, S., Xiao, H., Song, T. et al. HOXD9 is a potential prognostic biomarker involved in immune microenvironment of glioma. J Cancer Res Clin Oncol 149, 14911–14926 (2023). https://doi.org/10.1007/s00432-023-05275-z
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DOI: https://doi.org/10.1007/s00432-023-05275-z