Carcinoembryonic antigen (CEA)

Tumor markers are specific substances or proteins that are secreted or found in tumors. They can be useful for diagnosing, monitoring treatment, and predicting the course of the disease. One such marker is carcinoembryonic antigen (CEA).

CEA is a glycoprotein that is found in a number of tissues, including normal gastrointestinal, breast, lung, and liver tissues. However, its blood levels may be increased in the presence of tumors, particularly in gastrointestinal tumors, such as colon or rectal cancer.

Diagnosis using CEA involves measuring the level of this antigen in a patient's blood. This is usually done through a blood test. It is important to note that elevated CEA levels are not diagnostic of cancer, as this marker can also be elevated in other conditions, such as inflammatory processes or other intestinal diseases.

However, CEA can be useful in monitoring the progress of treatment and detecting recurrence. After treatment for a tumor, the level of CEA in the blood may decrease. An increase in CEA levels after treatment may indicate tumor regrowth or recurrence.

In addition, CEA can be used to predict the course of the disease and choose a treatment strategy. A high initial CEA level before treatment may indicate a more aggressive course of the tumor and may influence the decision about surgery or other treatment methods.

However, it is important to note that CEA is not a perfect marker for all types of cancer. It is most specific for colon and rectal cancer, and its effectiveness may be limited in other types of cancer. Therefore, doctors use CEA along with other diagnostic methods, such as examination, biopsy, and imaging studies (such as colonoscopy), to accurately diagnose cancer.

In conclusion, carcinoembryonic antigen (CEA) is an important tumor marker that can be used to diagnose, monitor, and predict tumor diseases, especially in the case of colon and rectal cancer. However, it is always important to consult a doctor and perform a complex of diagnostic procedures to accurately determine the patient's health status and choose the best treatment method.