CA19-9 is an acidic glycoside containing sialic acid, called ganglioside. Lewis blood group antigen is the precursor for the synthesis of CA19-9, which is formed by the combined action of sialic acid transferase and fucosyltransferase (FUT3). The ability to produce soluble blood group substances is determined by the alpha (1,2) fucosyltransferase gene (FUT2), which can be divided into secretory Se, weakly secretory Sew, and non secretory SE. The Lewis antigen positive (Lewis+) population has normal CA19-9 secretion function, while the Lewis antigen negative (Lewis -) population (about 7%) usually shows no or low secretion of CA19-9. Therefore, when CA19-9 is used as a biomarker, the combined detection of Lewis antigen status is a marker to judge the prognosis of pancreatic cancer, which can divide pancreatic cancer patients into high/medium/low malignant phenotypes.
Voluntarily enrolled, regardless of gender, aged ≥ 18 and ≤ 75 years old, and the patient can understand and is willing to sign an informed consent form;
ECOG 0-2
Pathologically confirmed as pancreatic ductal adenocarcinoma; Or confirmed by pathology and clinical examination as pancreatic ductal adenocarcinoma.
Willing to accept routine CA19-9 testing, Lewis antigen sample collection and testing (2-3ml), and follow-up Non pancreatic cancer subjects enrolled in this study must meet all the following criteria
Suffering from the second or double primary malignant tumor besides pancreatic cancer at the same time
Patients with pancreatic cancer who cannot trace the specific anti-cancer treatment plan
HIV positive
Other situations that researchers believe need to be excluded