Cancer Antigen (CA) 27.29 Blood Test
CA 27.29 is a protein that is used as a tumor marker to measure the progression of cancer in a person. This test can also be used to assess how well a person responds to therapy or treatment. CA 27.29 is not for screening purposes. This test is not considered to be sufficiently specific to determine whether an undiagnosed individual has breast cancer.
This test can be ordered as soon as the breast cancer diagnosis is made to see if it has metastasized or spread to other parts of the body. This test can also be ordered as you progress through breast cancer treatment to see whether the levels are lower, indicating that the treatment is working.
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