The Gastric Cancer Marker
CA 72-4 is a mucin-like glycoprotein that's most closely associated with gastric (stomach) cancer, though it's also elevated in ovarian, colorectal, and pancreatic cancers. It complements CEA and CA 19-9 for GI cancer monitoring. Like most tumor markers, it's better for monitoring than screening.
What is CA 72-4?
CA 72-4 is a mucin-like tumor-associated glycoprotein (TAG-72). Normal: <6 U/mL. Best specificity among GI tumor markers (fewer benign elevations than CEA or CA 19-9). Used in combination with CEA for gastric cancer monitoring.
↑ What High CA 72-4 Means
Concerning for gastric cancer (sensitivity ~40-50%), ovarian mucinous tumors, or other GI malignancies. Benign causes are relatively few compared to other tumor markers, making it somewhat more specific.
Common symptoms:
Often asymptomatic early · Gastric cancer: weight loss, early satiety, nausea, abdominal pain, anemia · CA 72-4 itself causes no symptoms
↓ What Low CA 72-4 Means
Reassuring.
Common symptoms:
No symptoms
Why It Matters
When normal:
Most specific GI tumor marker (fewer false positives)
Monitors gastric cancer treatment and recurrence
Complements CEA for GI cancer monitoring
Useful for mucinous ovarian cancer
Risks if abnormal:
Limited sensitivity (~40-50% for gastric cancer)
Not useful as standalone screening
Can be elevated in pancreatitis and liver cirrhosis
What Can Cause Abnormal Levels?
Gastric Cancer
35% likelyBest tumor marker for gastric cancer, though sensitivity is moderate.
Ovarian Mucinous Tumors
25% likelyMore specific for mucinous ovarian cancer than CA-125.
Other GI Cancers
Colorectal, pancreatic, esophageal.
Pancreatitis
Mild elevation possible.
Liver Cirrhosis
Mild elevation possible.
What You Can Do
CA 72-4 is a monitoring tool, not for screening
Impact: Best used in combination with CEA for GI cancers \u00B7 Timeline: N/A
If lifestyle changes aren't enough:
If elevated: upper GI endoscopy to evaluate for gastric cancer
Impact: Direct visualization and biopsy \u00B7 Timeline: As indicated
Recommended retest: Per oncology protocol for cancer monitoring
Related Markers
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