Tumor Markers
Key Information
Monitoring levels of tumor and indicating a recurrence
CEA (Carcinoembryonic Antigen) (Stomach)
Persistent elevated levels indicate residual or recurrent metastatic carcinoma; nonspecific to stomach cancer
CA 19-9 (Cancer Antigen 19-9) (Stomach)
Monitors post-therapeutic gastrointestinal cancer for recurrence; nonspecific to stomach cancer
CA 195 (Cancer Antigen 195) (Stomach)
Detects gastrointestinal cancers; changing level indicates progression or regression of tumor load; nonspecific to stomach cancer
SCC (Squamous Cell Carcinoma Antigen) (Esophagus)
Monitors tumor burden after treatment for squamous cell carcinoma; used in advanced cases; squamous cell specific
5-HIAA (5-Hydroxy-Indol Acetic Acid) (Small intestine)
Quantitative analysis of urine levels; levels above 15 mg/24 hours indicate malignant carcinoid tumors (argentaffinomas), which may also appear in stomach, appendix, or lower intestine
Go to the Tumor Markers page of the Diagnostic Tests module for more information.