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Comprehensive analysis of CTLA-4 in the tumor immune microenvironment of 33 cancer types.

Abstract：

:Immunotherapy has recently become a powerful weapon against cancer. Cytotoxic T lymphocyte-associated antigen-4 (CTLA-4) was the first immune checkpoint used for immunotherapy. However, CTLA-4-related mechanisms in various cancers have not been comprehensively investigated. This aim of this study was an in-depth investigation of CTLA-4 in the tumor microenvironment and its relationship with other immunomodulators, immune-related pathways and survival outcomes of 33 cancer types. Overall 9,743 tumor samples and 710 normal samples of 33 cancer types from The Cancer Genome Atlas (TCGA) database were included. CTLA-4 expression level was compared between tumor and normal tissues in 22 cancer types. The microenvironment cell populations (MCP)-counter method was used to analyze the correlation between CTLA-4 and immune cell infiltration. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses were employed to investigate its relationship with immune pathways. Survival analysis was conducted using the Kaplan-Meier method with log-rank test. CTLA-4 expression was found to be increased in some types of cancer and decreased in other cancer types (P < 0.05). When comparing between different tumor tissues, CTLA-4 was lowest in uveal melanoma (UVM). MCP analysis demonstrated that CTLA-4 had a strong correlation with T cells in almost all cancer types and that CTLA-4 showed a positive correlation with most immune cells in UVM. Immune pathway analysis found that CTLA-4 is involved in a variety of immune pathways. Survival analysis revealed that CTLA-4 can predict patients' survival outcomes. This comprehensive analysis of CTLA-4 will promote anti-CTLA-4 therapy and personalized combined immunotherapy.

journal_name

Int Immunopharmacol

journal_title

International immunopharmacology

authors

Zhang C,Chen J,Song Q,Sun X,Xue M,Yang Z,Shang J

doi

10.1016/j.intimp.2020.106633

subject

Has Abstract

pub_date

2020-08-01 00:00:00

pages

106633

eissn

1567-5769

issn

1878-1705

pii

S1567-5769(20)30686-X

journal_volume

85

pub_type

杂志文章

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