Abstract
Purpose
Tumor microenvironment (TME) affects the progression of rectal cancer (RC), and the clinical relevance of its immune elements was widely reported. Here we aim to delineate the complete TME landscape, including non-immune features, to improve our understanding of RC heterogeneity and provide a better strategy for precision medicine.
Methods
Single-cell analysis of GSE161277 using Seurat and Cellcall was performed to identify cell-cell interactions. The ssGSEA was employed to quantify the TME elements in TCGA patients, which were further clustered into subtypes by hclust. WGCNA and LASSO were combined to construct a degenerated signature for prognosis, and its performance was validated in two GEO datasets.
Results
We proposed a subtyping strategy based on the abundance of both immune and non-immune components, which divided all RC patients into 4 subtypes (Immune-, Canonical-, Dormant- and Stem-like). Different subtypes exhibited distinct mutation landscapes, biological features, immune characteristics, immunotherapy responses and prognoses. Next, WGCNA and LASSO regression were combined to construct a 10-gene signature based on differentially expressed genes among different subtypes. Subgroups divided by this signature also exhibited different clinical parameters and responses to immune checkpoint blockades. Diverse machine learning algorithms were applied to achieve higher accuracy for survival prediction and a nomogram was further established in combination with M stage and age to provide an accurate and visual prediction of prognosis.
Conclusions
We identified four TME-based RC subtypes with distinct biological and clinical features. Based on those subtypes, we also proposed a degenerated 10-gene signature to predict the prognosis and immunotherapy response.
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Data availability
All sequencing data were public available datasets (TCGA https://portal.gdc.cancer.gov/cart and GEO https://www.ncbi.nlm.nih.gov/geo/). All other data supporting the conclusions of this article are presented within the article and its supplementary files.
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Acknowledgements
We acknowledge the owners of TCGA, GEO and all other databases for providing valuable platforms and for making all those meaningful data available. All the contributions to those public datasets are deeply appreciated.
Funding
This work was supported by grants from the Beijing Nova Program of Science and Technology (Z191100001119128), the National Natural Science Foundation of China (82073390, 81702314), the Beijing Municipal Science and Technology Project (Z191100006619081), the Beijing Municipal Administration of Hospitals’ Youth Programme (QML20180108), the Funding Program for Excellent Talents of Beijing (2017000021469G212) and the Digestive Medical Coordinated Development Center of Beijing Municipal Administration of Hospitals (XXZ02, XXZ01). The study sponsors had no role in the design of the study and the preparation of this manuscript.
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Study concept and design: FB and LM. Data acquisition and data cleaning: YZ and FB. Data analysis and interpretation: FB, YSZ, YC and LS. Drafting of the manuscript: FB, XY, YZ and YSZ. Supervision: LM and SZ. Proofreading and revision: LM, SZ, LS, and YC. Critical revision of the manuscript for important intellectual content: All authors.
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Bu, F., Zhao, Y., Zhao, Y. et al. Distinct tumor microenvironment landscapes of rectal cancer for prognosis and prediction of immunotherapy response. Cell Oncol. 45, 1363–1381 (2022). https://doi.org/10.1007/s13402-022-00725-1
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DOI: https://doi.org/10.1007/s13402-022-00725-1