Immune Cell Profiles and Novel Insights Into Cancer Risk: A Focus on Oral and Pharyngeal Cancer

Area of Science:

• Immunology
• Oncology
• Genetics

Background:

• Oral and pharyngeal cancers represent a significant global health burden with over 850,000 new cases and 440,000 deaths annually.
• Understanding the interplay between the immune system and cancer development is crucial for effective treatment strategies.

Purpose of the Study:

• To investigate the causal relationship between specific immune cell profiles and the risk of developing oral and pharyngeal cancers.
• To validate these associations through experimental methods, elucidating underlying mechanisms.

Main Methods:

• A two-sample Mendelian randomization analysis was performed using large-scale genetic data for immune cell traits and oral-pharyngeal cancer.
• Multiple genetic analysis methods (IVW, MR-Egger, weighted median) were employed for robustness.
• Experimental validation utilized flow cytometry to examine immune cell-cancer cell interactions in coculture models.

Main Results:

• Mendelian randomization identified increased oral-pharyngeal cancer risk associated with elevated CD127 on CD45RA+ CD4+ T cells (OR=1.33), CD4 on CD39+ CD4+ T cells (OR=1.17), and HLA-DR on CD8+ T cells (OR=1.25).
• Experimental validation showed memory B cells promote cancer cell viability and inhibit apoptosis.
• Conversely, naive CD8+ T cells demonstrated antitumor effects by reducing cancer cell viability and inducing apoptosis.

Conclusions:

• The study establishes novel associations between specific immune cell phenotypes and oral-pharyngeal cancer risk.
• These findings provide mechanistic insights into immune cell roles in cancer.
• The results support the potential for developing personalized immunotherapies and precise patient stratification for oral-pharyngeal cancer treatment.