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Definition of a Novel Immunogenic Cell Death-Relevant Gene Signature Associated with Immune Landscape in Gastric Cancer

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Abstract

Immunogenic cell death (ICD) induces anti-tumor immunity and aids in dismantling the immunosuppressive immune microenvironment (TME), which belongs to a type of regulated cell death. The differentiation of gastric cancer (GC) subtypes and the discovery of prognostic biomarkers are crucial for its treatment because GC is a disease that is both highly heterogeneous and aggressive. However, although the induction of ICD in tumor cells is associated with a favorable prognosis, the exact mechanism of its role in GC remains unclear. Transcriptome profiling data and clinical data of GC patients were retrieved from The Cancer Genome Atlas (TCGA) database. Herein, patients were classified with the consensus clustering algorithm, and the associated biological functions and immune microenvironment infiltration were explored based on the expression of ICD-associated genes. A risk score signature consisting of 11 ICD-related genes was established via the least absolute shrinkage and selection operator regression (LASSO) method. We have retrieved similar studies in recent years and compared them with our study using the time-dependent receiver operating characteristic (ROC) curves. Gene set variation analysis (GSVA) and single sample gene set enrichment analysis (ssGSEA) were performed to explore the association between the signature and tumor microenvironment (TME). Two distinct subtypes associated with ICD in GC were identified, each with a different prognosis. The ICD-high expression subtype was associated with higher immune cell infiltration and a better prognosis. The ICD-related gene signature containing 11 genes (CGB5, Z84468.1, APOA5, EPHA8, CLEC18C, TLR7, MUC7, MUC15, CTLA4, CALB2, and UGT2B28), could independently and accurately predict the prognosis of GC. In this study, an ICD-based classification was conducted to assist in the diagnosis and personalized therapy for GC. The ICD-related genes risk score model was established to predict prognosis.

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Data Availability

All data generated and described in this paper are available from the corresponding web servers. Further inquiries can be directed to the corresponding authors.

Abbreviations

GC:

Gastric cancer

ICD:

Immunogenic cell death

IRGs:

ICD-related genes

TCGA:

The Cancer Genome Atlas

GEO:

The Gene Expression Omnibus

LASSO:

Least absolute shrinkage and selection operator regression

TME:

Tumor microenvironment

CDF:

Cumulative distribution function

PCA:

Principal component analysis

OS:

Overall survival

ssGSEA:

Single sample gene set enrichment analysis

ICGs:

Immune checkpoint genes

ICB:

Immune checkpoint blockade

TIDE:

The Tumor Immune Dysfunction and Exclusion

IPS:

The immunophenoscore

ICIs:

Immune checkpoint inhibitors

DEGs:

Differentially expressed genes

GO:

Gene Ontology

KEGG:

Kyoto Encyclopedia of Genes and Genomes

ROC:

Receiver operating characteristic

AUC:

Areas under the curve

C-index:

The concordance index

TMB:

Tumor mutation burden

IC50:

The semi-inhibitory concentration

GSVA:

Gene Set Enrichment Analysis

TLRs:

Toll-like receptors

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Funding

This study was supported by the National Key Research and Development Program of China (2018YFC2002000).

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Contributions

The authors confirm contribution to the paper as follows: study conception and design: YM; data collection: ZJ; analysis and interpretation of results: DC; validation of results: MW; visualization of results: MZ and YH; draft manuscript preparation: YM and SX; manuscript review & editing: ZX; All authors reviewed the results and approved the final version of the manuscript.

Corresponding authors

Correspondence to Shang Xia or Zhifang Xiong.

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The authors declare no competing interests.

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This study does not contain any studies with human participants or animals performed by any of the authors.

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Meng, Y., Jin, Z., Wang, M. et al. Definition of a Novel Immunogenic Cell Death-Relevant Gene Signature Associated with Immune Landscape in Gastric Cancer. Biochem Genet 61, 2092–2115 (2023). https://doi.org/10.1007/s10528-023-10361-5

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  • DOI: https://doi.org/10.1007/s10528-023-10361-5

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