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ENT · Head and neck: p16 status
Sample itemIn oropharyngeal squamous cell carcinoma, positive p16 immunostaining is used as a surrogate marker of what, and what is its significance?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
A. HPV-related disease, which carries a better prognosis
p16 overexpression indicates transcriptionally active high-risk HPV, usually type 16. HPV-positive oropharyngeal cancers respond better to treatment and have a better prognosis than HPV-negative ones, and have a separate staging system.
Option by option
A. HPV-related disease, which carries a better prognosis (correct)
Correct. p16 marks HPV-driven cancers with better outcomes.
B. EBV infection with a poor prognosis
EBV markers relate to nasopharyngeal cancer.
C. HIV infection
HIV is not what p16 marks.
D. Tobacco-related mutations with a better prognosis
Tobacco-related cancers are usually p16 negative with poorer outcomes.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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