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Rare AFP-secreting tumor types include carcinoma in a mixed Müllerian tumor. [14] The Sertoli-Leydig cell tumor, which itself is rare, rarely secretes AFP. [15] In Wilms tumor AFP is rarely elevated, but when it is elevated it may serve as a marker of disease progression or recurrence. [16]
Studies have shown that AFP-L3% test results of more than 10% can be indicative of early HCC [citation needed] or early nonseminomatous germ cell tumor. [ 1 ] Early testimonials from hepatologists indicate that there is a target patient population for the AFP-L3% assay.
These cells secrete alpha-fetoprotein (AFP), which can be detected in tumor tissue, serum, cerebrospinal fluid, urine and, in the rare case of fetal EST, in amniotic fluid. When there is incongruence between biopsy and AFP test results for EST, the result indicating presence of EST dictates treatment. [ 3 ]
Tumor marker Associated tumor types Alpha fetoprotein (AFP) germ cell tumor, hepatocellular carcinoma [9] CA15-3: breast cancer [10] CA27.29: breast cancer [11] CA19-9: Mainly pancreatic cancer, but also colorectal cancer and other types of gastrointestinal cancer. [12] CA-125
Of special concern is the secretion of alpha-fetoprotein (AFP); under some circumstances, AFP can be used as a diagnostic marker specific for the presence of yolk sac cells within the teratoma. These cells can develop into a frankly malignant tumor known as yolk sac tumor or endodermal sinus tumor.
The usual markers for liver disease – aspartate aminotransferase, alanine aminotransferase and alkaline phosphatase – are often normal or only slightly elevated. FLC often does not produce alpha fetoprotein (AFP), a widely used marker for conventional hepatocellular carcinoma.
Alpha-fetoprotein (AFP, α-fetoprotein; also sometimes called alpha-1-fetoprotein, alpha-fetoglobulin, or alpha fetal protein) is a protein [5] [6] that in humans is encoded by the AFP gene. [ 7 ] [ 8 ] The AFP gene is located on the q arm of chromosome 4 (4q13.3). [ 9 ]
In pregnant people AFP levels rise at 14 weeks until 32 weeks, and range between 10 and 150 ng/mL in the middle of gestation. This is why AFP can be used alongside other tests as a tumor marker protein in adults. [12] AFP is a single polypeptide chain with a half-life of 4–5 days.