Mucins, including Du-PAN 2, SPan-1, and CAM17.1, represent another class of glycoprotein biomarkers; Du-PAN 2 is notable for recognizing a tumor marker in Lewis a-b-individuals with a sensitivity of 48–72%, while SPan-1 initially showed promise with a sensitivity of 82–92%, although it does not significantly enhance the accuracy of CA19-9. This evidence concerns the gene ART4 and neoplasm.