Abstract
Background
Most studies on subtype identification of colorectal cancer (CRC) were based on expressions of either genes or immune cells. However, few studies have hitherto used the combination of genes with immune and stroma cells for subtype identification.
Methods
Dataset GSE17536 was obtained from the Gene Expression Omnibus (GEO) database. The xCell algorithm was used to estimate the composition and density of 64 cell types, including immune and stroma cell types. Clustering analysis was then conducted on the top 3000 most variable genes from a total of 20,174 genes for CRC subtype identification. We employed the ensemble method of Similarity network fusion and 112 Consensus Clustering (SNF-CC) for cancer subtype identification. Reactome pathway analysis was conducted to identify the impact of the representative genes on prognosis. The results were validated in independent gene expression data from dataset GSE17537.
Results
In this study, we identified 3 clinically relevant subtypes and their representative genes, immune and stroma cells. Moreover, we confirmed the correlation of these subtypes with their clinical characteristics. The representative genes of the subtype with poor prognosis correlated with extracellular matrix structural constituent, while the subtype with good prognosis correlated with Toll-like receptor signaling pathway or chemokine signaling pathway. However, different subtypes were associated with distinct cell subtypes; the subtype with poor prognosis had a high abundance of fibroblasts and endothelial cells; the subtype with median prognosis had a higher abundance of immune cells, such as CD4 + T-cell, Th2 cells and aDC; the subtype with good prognosis had a higher abundance of NKT.
Conclusion
This study highlights the utility of immune and innate cells, especially during gene analysis, to provide the theoretical basis for personalized treatment in colorectal cancer patients.
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Acknowledgements
We thank Dr. Yihan Zhang and Christ-Jonathan Tsia Hin Fong for their contribution to language polishing.
Funding
This work is funded by the National Natural Science Foundation of China (81974296, 81772127), the Science and Technology Program of Guangzhou, China (201903010039), the International cooperation project of Guangdong science and technology plan (2020A0505100034), and the Natural Science Foundation of Guangdong Province, China (2017A030313492; 2018A030313608).
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BH, JG, and QZH: designed the study and take responsibility for the integrity of the data and the accuracy of the data analysis. CCX, XJL, GSZ, JC, FH, and HPC: collected and analyzed the data and wrote the paper. JG, DLY, and LPS: contributed to the statistical analysis. XGZ, XJL, and CCX: contributed to revision of the manuscript. All authors contributed to data interpretation and reviewed and approved the final version.
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Xiao, C., Zhao, X., Li, X. et al. Classification of colorectal cancer into clinically relevant subtypes based on genes and mesenchymal cells. Clin Transl Oncol 25, 491–502 (2023). https://doi.org/10.1007/s12094-022-02964-y
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DOI: https://doi.org/10.1007/s12094-022-02964-y