Carcinoembryonic antigen (CEA) is a glycoprotein involved in cell adhesion and is one of the most widely used tumor markers, especially in gastrointestinal malignancies.
CEA is commonly overexpressed in several cancers, most notably colorectal cancer, but also in cancers of the lung, pancreas, breast, and others.
– Both tissue expression and serum CEA levels can be monitored; serum measurements are frequently used in clinical practice.
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