<unk>  <unk>  describes a set of highly related glycoproteins involved in cell adhesion.<unk>  is normally produced in gastrointestinal tissue during fetal development, but the production stops before birth. Consequently,<unk>  is usually present at very low levels in the blood of healthy adults (about 2-4 ng/mL). However, the serum levels are raised in some types of cancer, which means that it can be used as a tumor marker in clinical tests. Serum levels can also be elevated in heavy smokers.<unk>  are glycosyl phosphatidyl inositol (GPI) cell-surface-anchored glycoproteins whose specialized sialofucosylated glycoforms serve as functional colon carcinoma L-selectin and E-selectin ligands, which may be critical to the metastatic dissemination of colon carcinoma cells. Immunologically they are characterized as members of the CD66 cluster of differentiation. The proteins include CD66a, CD66b, CD66c, CD66d, CD66e, CD66f.
Carcinoembryonic antigen
Alpha-fetoprotein
Prostate-specific antigen
Mammaglobin
Tumor marker
Tumor antigen
Early prostate cancer antigen-2
CA 15-3