Causal association between immune cell phenotypes and colorectal cancer: a two-sample bidirectional Mendelian...

Area of Science:

• Immunology
• Oncology
• Genetics

Background:

• Colorectal cancer (CRC) is a major cause of cancer mortality globally.
• Immune system alterations are implicated in CRC initiation and progression.
• The exact causal link between immune cell phenotypes and CRC is not fully understood.

Purpose of the Study:

• To investigate the causal relationship between immune cell phenotypes and colorectal cancer (CRC) risk.
• To identify potential immune cell biomarkers and therapeutic targets for CRC.
• To elucidate the role of the immune system in CRC development.

Main Methods:

• A bidirectional Mendelian randomization (MR) analysis was performed.
• Genetic variants served as instrumental variables (IVs).
• Inverse variance weighting (IVW) and sensitivity analyses were used to assess causality and robustness.

Main Results:

• The MR analysis identified potential causal associations between immune phenotypes and CRC.
• 34 immune cell types were linked to colon cancer, and 29 to rectal cancer.
• Sensitivity analyses confirmed the robustness of these immune-CRC associations.

Conclusions:

• This study provides evidence for a causal relationship between immune cell phenotypes and CRC.
• Immune cell characteristics may serve as potential biomarkers for CRC.
• These findings highlight potential novel therapeutic targets for CRC treatment.