Characterizing the Tumor Microenvironment and Its Correlation with cDC1-Related Gene Expression in Gastric Cancer

Area of Science:

• Immunology
• Oncology
• Genomics

Background:

• The tumor microenvironment significantly influences cancer progression and patient outcomes.
• Type 1 conventional dendritic cells (cDC1s) play a crucial role in anti-tumor immunity.
• Understanding the role of cDC1-related genes in gastric cancer (GC) is essential for developing effective therapies.

Purpose of the Study:

• To investigate the prognostic value of a cDC1-related gene signature in gastric cancer.
• To explore the association between the cDC1 signature and the tumor immune microenvironment in GC.
• To identify potential therapeutic targets within the cDC1-mediated immune response in GC.

Main Methods:

• Analysis of RNA-seq data from TCGA-STAD and GEO datasets.
• Definition and stratification of a cDC1-related gene signature into high and low expression groups.
• Gene Set Variation Analysis (GSVA) for oncogenic pathways and statistical modeling (Kaplan-Meier, Cox models).

Main Results:

• A high cDC1-related gene signature was linked to poorer overall and disease-free survival in GC patients.
• Significant differences in CD8+ T cell infiltration and cytotoxic activity were observed between high and low signature groups.
• The cDC1 signature correlated with increased immune checkpoint proteins and oncogenic pathways, indicating an immunosuppressive tumor microenvironment.

Conclusions:

• The cDC1-related gene signature shows potential as a prognostic biomarker in GC.
• cDC1s are critical in shaping the GC tumor microenvironment and influencing patient prognosis.
• These findings may inform novel therapeutic strategies targeting the GC immune microenvironment.