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Cancer Antigen 15.3 (CA 15.3)

What is Cancer Antigen 15.3 (CA 15.3)?

Cancer Antigen 15.3 (CA 15.3) is a tumour marker primarily associated with breast cancer. It is a protein found on the surface of certain cancer cells and may be released into the bloodstream. CA 15.3 testing is used to support cancer diagnosis, treatment monitoring, and detection of recurrence.

CA 15.3 and Breast Cancer Detection

Elevated levels of CA 15.3 in the blood may suggest the presence of breast cancer. However, CA 15.3 is not exclusive to breast cancer, and elevated levels can also occur in other conditions. Therefore, the test is typically used alongside imaging studies and tissue biopsies to confirm diagnosis and guide treatment decisions.

Monitoring Treatment and Recurrence

CA 15.3 testing is commonly used to:

Monitor the effectiveness of breast cancer treatment

Detect possible cancer recurrence during follow-up care

It can be helpful in tracking trends over time, although it may not always directly correlate with disease progression in all patients.

Limitations of CA 15.3 Testing

While CA 15.3 is a useful marker, it is not entirely specific to cancer. Elevated levels can also occur in non-cancerous conditions such as:

Liver disease

Benign breast disorders

Ovarian cysts or endometriosis

Because of this, CA 15.3 results must always be interpreted in the context of other clinical findings.

CA 15.3 Testing in Slough and Surrounding Areas

Private CA 15.3 tumour marker testing is available in Slough, Windsor, Langley, Burnham, and Maidenhead. This blood test can support breast cancer monitoring and aid in treatment evaluation when combined with clinical assessment and imaging. CA 15.3 testing is a valuable part of a comprehensive approach to cancer care and ongoing patient management.

There is an additional £20 phlebotomy fee for every donation.