<unk>  is the sialylated form of Lewis AntigenA. It is a tetrasaccharide with the sequence Neu5Acα2-3Galβ1-3Fucα1-4GlcNAcβ.
CA19-9
CA 15-3
CA-125
AFP-L3
Alpha-fetoprotein
HER2/neu
Carcinoembryonic antigen peptide-1
BerEp4