The effect of colorectal cancer upon host peripheral immune cell function

Area of Science:

• Immunology
• Oncology
• Cellular Biology

Background:

• Colorectal cancer (CRC) exhibits immunogenicity yet is linked to host immune suppression.
• Understanding CRC-associated immune suppression mechanisms is crucial for developing effective immunotherapies.

Purpose of the Study:

• To investigate immune cell function in patients with colorectal cancer.
• To assess the impact of CRC on immune cell composition and cytokine profiles.

Main Methods:

• Blood samples were collected from 80 CRC patients and 38 controls.
• White blood cell composition was analyzed using monoclonal antibodies.
• Cytokine levels (IFN-gamma, TNF-alpha, IL-2, IL-10, IL-4, IL-6) and peripheral blood mononuclear cell (PBMC) proliferation were measured.

Main Results:

• CRC patients showed altered immune cell percentages, with decreased monocytes and NKT cells in advanced stages.
• Stage IV patients had reduced total lymphocyte percentages.
• Patients exhibited lower PBMC proliferation and diminished TH1 cytokine (IFN-gamma, TNF-alpha) production compared to controls.
• IFN-gamma and TNF-alpha levels decreased with increasing tumor vascular invasion.

Conclusions:

• Colorectal cancer triggers an immune response that alters the cytokine balance.
• Immune system alterations are more pronounced in advanced-stage CRC and with systemic disease spread.