Definition: a protein normally produced during the 12th–15th weeks of gestation, decreasing thereafter, but appearing in the blood in certain tumors, such as embryonal carcinomas of the testis and ovary, hepatoma, and less often in patients with carcinomas of the pancreas, stomach, colon, or lung. When present, a useful marker in following the course of a tumor.
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Examples: glitazone, GI cocktail, etc.