Enzyme immunoassay for carcinoembryonic antigen

Area of Science:

• Biochemistry
• Clinical Chemistry

Background:

• Carcinoembryonic antigen (CEA) is a tumor marker.
• Accurate and efficient assays are needed for monitoring cancer patients.

Purpose of the Study:

• To develop and validate a rapid, simple enzyme immunoassay for serum CEA.
• To assess the assay's performance characteristics and suitability for clinical use.

Main Methods:

• A "sandwich" enzyme immunoassay was developed.
• Serum CEA was extracted and detected using anti-CEA coated microtitration plates and horseradish peroxidase conjugation.
• Enzyme activity was quantified using a substrate, with sensitivity to 3.1 µg/L.

Main Results:

• The assay demonstrated high sensitivity (0.39 µg/L with extended incubation) and precision (CV 8.0%).
• Analytical recoveries were adequate.
• Results showed strong correlation (r = 0.99) with a radioimmunoassay kit.

Conclusions:

• The developed enzyme immunoassay is a rapid, simple, sensitive, and precise method for serum CEA determination.
• This assay is suitable for monitoring patients with colorectal tumors post-surgery.