Which tumour marker is used mainly for follow-up of colorectal cancer?
Answer and explanation
Correct answer: A. Carcinoembryonic antigen
- Step 1: CEA is used to monitor recurrence rather than screen.
- Step 2: It can be raised in smokers.
Answer
Carcinoembryonic antigen.
Why not the others: 'Alpha-fetoprotein' is associated with hepatocellular carcinoma; 'CA-125' is associated with ovarian cancer; 'PSA' is associated with prostate cancer.
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