Immune Infiltration Landscape in Lung Squamous Cell Carcinoma Implications

Area of Science:

• Immunology
• Oncology
• Computational Biology

Background:

• The tumor microenvironment, comprising cancer cells and tumor-infiltrating immune cells (TIICs), dictates the malignant phenotype of lung squamous cell carcinoma (LUSC).
• Characterizing the immune microenvironment of LUSC is crucial for identifying patients who may benefit from immunotherapy.

Purpose of the Study:

• To analyze the distribution and clinical relevance of TIIC subpopulations in LUSC.
• To identify distinct TIIC subgroups associated with different survival patterns in LUSC.
• To enhance understanding of LUSC development and immunotherapy strategies.

Main Methods:

• Utilized large public LUSC cohorts from TCGA and GEO datasets.
• Employed CIBERSORT to evaluate 22 types of infiltrating immune cell subgroups.
• Applied meta-analysis, principal component analysis (PCA), ssGSEA, and hierarchical clustering for immune response evaluation.

Main Results:

• Demonstrated a significantly different distribution of TIICs in LUSC compared to normal tissue.
• Established close associations between TIIC subpopulations and LUSC clinical features and molecular subtypes.
• Identified three distinct TIIC subgroups with varying survival outcomes through unsupervised clustering.

Conclusions:

• TIICs play a significant role in the pathogenesis and progression of LUSC.
• The composition of TIICs influences tumor metabolism, pathological stage, and patient survival.
• This immune landscape characterization offers a more accurate framework for understanding LUSC development and guiding immunotherapy.