FRCPath Part 1 Practice Questions - FRCPath Part 1 Examination Exam

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Immunohistochemistry on a poorly differentiated metastatic carcinoma of unknown primary shows CK7-positive, CK20-negative, TTF-1-positive staining. Which primary site is most likely?

Colon Bladder (urothelial) Prostate Lung

Correct Answer:

Lung

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