alpha fetoprotein

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α fe·to·pro·tein

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.

alpha fetoprotein

/al·pha fe·to·pro·tein/ (fe″to-pro´tēn) a plasma protein produced by the fetal liver, yolk sac, and gastrointestinal tract and also by hepatocellular carcinoma, germ cell neoplasms, other cancers, and some benign hepatic diseases in adults. The serum AFP level is used to monitor the effectiveness of cancer treatment, and the amniotic fluid AFP level is used in the prenatal diagnosis of neural tube defects.

alpha fetoprotein

A protein encoded by the AFP gene on chromosome 4q25 that is produced by the yolk sac and liver during embryonic development and thought to play the same role as serum albumin in adults. It bind copper, nickel, fatty acids and bilirubin and occurs naturally as a monomer, homodimer and homotrimer. Alpha fetoprotein is typically measured in two contexts: during pregnancy, either in amniotic fluid or serum as a screen for neural tube defects or other developmental defects (see table); and in adults suspected of hepatocellular carcinoma or germ cell tumours—i.e., testicular, ovarian, and far less commonly, of the stomach and pancreas (for the latter two of which AFP has no practical diagnostic utility). 

AFP elevation in pregnancy 
• Cardiovascular—Fallot’s tetralogy. 
• CNS defects—Anencephaly, spina bifida, other open neural tube defects, hydrocephaly, cyclopia, microcephaly, sacrococcygeal teratoma.
• GI defects—Oesophageal and duodenal atresia with impaired foetal swallowing, omphalocele due to transudation, gastroschisis, pseudo-obstruction and short bowel.
• Hematology—Fetomaternal haemorrhage, hydrops fetalis.
• Immunodeficiency syndromes—SCID and/or ADA deficiency, combined T- and B-cell defects, ataxia-telangiectasia.
• Miscellaneous—Cystic hygroma, Turner syndrome, foetal demise, twin gestation, congenital nephrotic syndrome.

AFP is also increased in infants at high risk of foetal death up to 4–5 months after screening, regardless of the presence of neural tube defects or multiple gestations.
References in periodicals archive ?
The poor prognostic indicators in patients with HCC include presence of paraneoplastic syndrome including humoral secretion of PTHrP, large tumour volume and raised alpha fetoprotein (AFP).
Markedly elevated serum alpha fetoprotein levels facilitated the diagnosis.
Laboratory studies revealed that her serum alpha fetoprotein level was 7,020 ng/ml (normal: 0-10).
Only a very few tumor cells showed strong alpha fetoprotein positivity.
Clinically, the patient experienced a complete resolution of her facial nerve palsy (figure 6), and her serum alpha fetoprotein levels returned to normal (4.
The determinant points were the elevated serum alpha fetoprotein level, the histology of the tumor, and the dramatic response to triple-drug chemotherapy.
None of these tumors has been associated with elevated serum alpha fetoprotein levels.
Although only a very few tumor cells were positive for alpha fetoprotein, the serum alpha fetoprotein level was markedly elevated.
Of cases Abdominal distension 14 Lump/mass abdomen 05 Abdominal distension + icterus 01 Beckwith-Wiedemann syndrome 01 Anemia 01 TABLE No: 4 ALPHA FETOPROTEIN LEVELS IN 11 PATIENTS OF HEPATOBLASTOMA LEVELS (IU/ml)) No.
Complete blood count, liver function test, total protein, A/G ratio, serum Albumin, HBsAg, anti HCV, alpha fetoprotein, ultrasound guided liver biopsy, ultrasound whole abdomen and CTscan Abdomen, were done.
Alpha Fetoprotein levels after one month dropped to 5.