[Immunoglobulins and the complement system in colorectal cancer]

Area of Science:

• Immunology
• Oncology
• Biochemistry

Background:

• Colorectal cancer (CRC) is a significant global health concern.
• Understanding immune system alterations in CRC patients is crucial for prognosis.
• Immunoglobulins and complement factors may serve as potential biomarkers.

Purpose of the Study:

• To investigate the concentrations of immunoglobulins (IgG, IgA, IgM) and complement factors (C3, C4) in colorectal cancer patients.
• To correlate these immune parameters with clinical outcomes, including tumor recurrence and metastasis.
• To identify potential immunologic alterations associated with colorectal carcinoma.

Main Methods:

• Peripheral blood samples were collected from 120 operated colorectal cancer patients.
• Concentrations of IgG, IgA, IgM, C3, and C4 were measured.
• Preoperative, postoperative, and recurrence diagnosis values were compared and analyzed against clinical data.

Main Results:

• No significant correlation was found between studied immune parameters and patient age, sex, tumor location, or Duke's clinical stage.
• Elevated preoperative and postoperative immunoglobulin A (IgA) levels were associated with a poor prognosis (60% and 80% recurrence, respectively).
• Elevated postoperative complement C3 levels were strongly linked to poor prognosis, with 80% recurrence and 85% metastasis rates.

Conclusions:

• Immunoglobulin A and complement C3 levels are significant prognostic indicators in colorectal cancer.
• Elevated IgA and C3 post-surgery suggest a higher risk of tumor recurrence and metastasis.
• These immune markers could aid in identifying high-risk CRC patients requiring closer monitoring.