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19001717 Carcinoembryonic antigen (CEA) is a protein of the developing fetus. CEA levels gradually decrease or disappear after birth. In adults, abnormal CEA levels can indicate cancer. Smoking can also increase CEA. The test helps monitor treatment and checks for the recurrence of cancers of the colon, thyroid gland, rectum, lung, breast, liver, pancreas, stomach, and ovaries.
