Which statement best describes tumor markers?

Which statement best describes tumor markers?

• A. Biologic substances synthesized and released by cancer cells or substances produced by the host in response to cancer cells
• B. Analytic tests used to mark cancer cells
• C. Radioactive substances used to help identify cancer
• D. None of these

Answer: (A)

Tumor markers are biologic substances that indicate the presence or activity of cancer. They can be produced directly by cancer cells or by the body's tissues in response to cancer. These markers—often proteins, enzymes, hormones, or other molecules—can be measured in blood, urine, or tissue and are used to monitor disease status, assess prognosis, and gauge response to therapy. They are not imaging labels or stains applied to cancer cells, nor are they simply analytic tests that mark cancer cells directly. This makes the statement that tumor markers are biologic substances synthesized and released by cancer cells or by the host in response to cancer the best description.

Tumor markers are biologic substances that indicate the presence or activity of cancer. They can be produced directly by cancer cells or by the body's tissues in response to cancer. These markers—often proteins, enzymes, hormones, or other molecules—can be measured in blood, urine, or tissue and are used to monitor disease status, assess prognosis, and gauge response to therapy. They are not imaging labels or stains applied to cancer cells, nor are they simply analytic tests that mark cancer cells directly. This makes the statement that tumor markers are biologic substances synthesized and released by cancer cells or by the host in response to cancer the best description.