CA 27.29 is a mucin antigen that is a marker for breast carcinoma.
- CA 27.29 is similar to CA 15-3 in sensitivity and specificity, and thus is not effective as a screening tool for early tumor growth.
- The CA 27.29 marker appears more readily in the ascitic fluid of patients with metastatic breast cancer.
- CA 27.29 is used to detect recurrence or metastasis of breast cancer following successful eradication of a tumor.10