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Colorectal carcinoma. Evidence for circulating CEA-anti-CEA complexes
Cancer
|July 1, 1983
Summary
Circulating immune complexes of Carcinoembryonic antigen (CEA) and anti-CEA antibodies were detected in colorectal cancer patients. This suggests CEA autoimmunogenicity, potentially impacting cancer diagnosis and monitoring.
Area of Science:
- Oncology
- Immunology
- Biochemistry
Background:
- Carcinoembryonic antigen (CEA) is a tumor marker often elevated in colorectal cancer.
- The presence and significance of circulating CEA-anti-CEA complexes in colorectal cancer are not fully understood.
Purpose of the Study:
- To investigate the presence of circulating CEA-anti-CEA complexes.
- To explore the autoimmunogenicity of CEA in colorectal cancer patients.
Main Methods:
- Elution of immune complexes from patient plasma using 2.5 M MgCl2.
- Measurement of plasma CEA levels before and after elution.
- Assessing the specific binding of eluted IgG to 125I-CEA.
Main Results:
- Significant CEA increments were observed after MgCl2 elution in patients with disseminated or subclinical colorectal cancer.
- IgG eluted from patients with high CEA increments showed enhanced specific binding to CEA compared to those with negligible increments.
- These findings support the hypothesis of CEA autoimmunogenicity.
Conclusions:
- CEA appears to be autoimmunogenic in colorectal cancer patients, leading to the formation of circulating CEA-anti-CEA complexes.
- The clinical utility of detecting these complexes for diagnosis and monitoring requires further investigation.