Immune Cell Composition in Human Non-small Cell Lung Cancer.

Area of Science:

• Oncology
• Immunology
• Flow Cytometry

Background:

• Non-small cell lung cancer (NSCLC) is a leading cause of cancer mortality worldwide.
• Understanding the tumor microenvironment's immune cell composition is crucial for predicting immunotherapy response.
• The precise immune cell profile within NSCLC remains incompletely characterized.

Purpose of the Study:

• To comprehensively characterize the immune cell infiltrate in NSCLC tumors.
• To compare immune cell populations in NSCLC tumors versus non-cancerous lung tissue, lymph nodes, and blood.
• To provide a detailed methodology for immune cell identification in NSCLC.

Main Methods:

• Utilized flow cytometry to analyze immune cells (CD45+).
• Identified and quantified thirteen distinct immune cell types within NSCLC tumors.
• Detailed antibody panels and gating strategies were employed for cellular identification.

Main Results:

• T cells (47%) and B cells (16%) were the most abundant immune cells in NSCLC tumors.
• B cells were significantly more represented in tumors compared to distal lung tissue.
• Macrophages and NK cells were less abundant in tumors than in non-cancerous lung tissue, but macrophages showed higher HLA-DR expression.

Conclusions:

• This study provides a detailed immune cell landscape of NSCLC tumors.
• The findings highlight differences in immune cell distribution between tumor and non-cancerous lung tissue.
• The described methodology serves as a valuable resource for immunomonitoring in NSCLC patients.