What is a prostate cancer marker?

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Multiple Choice

What is a prostate cancer marker?

A cancer marker is a molecule that can be measured in blood or tissue and reflects the presence or activity of cancer. For prostate cancer, the most commonly used marker is prostate-specific antigen, or PSA. PSA is produced by the cells of the prostate, so its level in the blood tends to rise when the prostate is affected by cancer. Measuring PSA helps with screening decisions, guiding whether a biopsy is needed, and monitoring how well treatment is working or whether cancer has recurred. PSA is typically reported as total PSA (tPSA). It’s important to know that PSA can be elevated for reasons other than cancer, such as aging, prostatitis, or benign prostatic hyperplasia, so it isn’t perfectly specific. Clinicians often consider additional factors, like the ratio of free PSA to total PSA or how quickly PSA changes over time (PSA velocity), to improve accuracy. Other markers listed are associated with different cancers: CEA is linked mainly to colorectal cancer and some other tumors, CA 125 to ovarian cancer, and AFP to liver cancers and certain germ cell tumors. They aren’t used as prostate cancer markers, which is why PSA stands out in this context.

A cancer marker is a molecule that can be measured in blood or tissue and reflects the presence or activity of cancer. For prostate cancer, the most commonly used marker is prostate-specific antigen, or PSA. PSA is produced by the cells of the prostate, so its level in the blood tends to rise when the prostate is affected by cancer. Measuring PSA helps with screening decisions, guiding whether a biopsy is needed, and monitoring how well treatment is working or whether cancer has recurred.

PSA is typically reported as total PSA (tPSA). It’s important to know that PSA can be elevated for reasons other than cancer, such as aging, prostatitis, or benign prostatic hyperplasia, so it isn’t perfectly specific. Clinicians often consider additional factors, like the ratio of free PSA to total PSA or how quickly PSA changes over time (PSA velocity), to improve accuracy.

Other markers listed are associated with different cancers: CEA is linked mainly to colorectal cancer and some other tumors, CA 125 to ovarian cancer, and AFP to liver cancers and certain germ cell tumors. They aren’t used as prostate cancer markers, which is why PSA stands out in this context.

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