The five tumor tests, including carcinoembryonic antigen, glycoantigen 125, glycoantigen 153, glycoantigen 724, and glycoantigen 199, can detect lung cancer, breast cancer, stomach cancer, intestinal cancer, liver cancer, prostate cancer, and ovarian cancer by checking carcinoembryonic antigen. Ovarian cancer can be detected by checking glycoconjugate antigen 125, and there are some patients with malignant ascites who can also have elevated glycoconjugate antigen 125, and in some patients with lung adenocarcinoma, elevated glycoconjugate antigen 125 can also be monitored in the blood. In women, breast cancer can be detected by glycoantigen 153. Elevated glycoconjugate antigen 724 can detect tumors of the gastrointestinal tract such as stomach, intestinal, and pancreatic cancers. Elevated glycoconjugate antigen 199 is usually found in patients with pancreatic cancer, and elevated glycoconjugate antigen 199 can also detect gastrointestinal tumors such as gastric cancer and intestinal cancer.