Cancer antigen 15-3 (CA 15-3)

A serum biomarker.

Cancer antigen 15-3 (CA 15-3) is used to monitor response to breast cancer treatment and disease recurrence.

The reference range of serum CA 15-3 is less than 30 U/mL.

Clinically useful for some patients with metastatic breast cancer with a sensitivity of 60-70% sensitivity.

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