CA 15.3

Cancer Antigen 15-3 (CA15-3) is a protein synthesized by various cells, with a notable presence in breast cancer cells. This protein is released into the bloodstream, allowing for its quantification as a potential diagnostic marker. Elevated levels of CA15-3 are commonly observed in women diagnosed with metastatic breast cancer, indicating the spread of the disease to other regions of the body. It is essential to note that not all types of breast cancer lead to an increase in CA15-3 levels, as certain cancer cell variants do not exhibit overproduction of this specific antigen. Consequently, CA15-3 serves as a valuable biomarker, aiding in the identification and monitoring of metastatic breast cancer, although its effectiveness may vary among different breast cancer subtypes.