CA 125 - Testing Experience

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What is CA 125? What is a tumor marker?

CA 125 is a protein that is a so-called tumor marker or biomarker, which is a substance that is found in greater concentration in tumor cells than in other cells of the body. In particular, CA 125 is present in greater concentration in ovarian cancer cells than in other cells. It was first identified in the early 1980s, and the function of the CA 125 protein is not currently understood. CA stands for cancer antigen.

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See what others are saying

Comment from: Nikky, 45-54 Female (Patient) Published: April 14

I have had a CA125 blood test, the first one's result was 50, and 6 weeks later it was 129. They have fast tracked me to see a gynecologist as it maybe cervical or ovarian cancer. I am stressed to death and alongside this my ferritin is only 8. I am worried if this means I have cancer.

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Comment from: Marg, 55-64 Female (Patient) Published: August 11

I had a CA125 reading at the start of my cancer of 8,319. I had an ovarian operation and today finished my 6th cycle of chemotherapy. My CA125 count is now 25. I will still will have ongoing treatment but I feel I now have hope for the future.

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