A 52-year-old male is diagnosed with oropharyngeal squamous cell carcinoma. Immunohistochemistry shows p16 positivity. According to AJCC 8th edition, how does p16-positive status affect the staging of oropharyngeal cancer compared to p16-negative disease?
- A p16 status does not affect staging but only prognosis
- B p16-positive tumors are automatically downstaged by one stage group
- C p16-positive tumors are staged using a separate staging system with different T and N categories ✓
- D p16-positive tumors are classified as nasopharyngeal carcinoma for staging purposes
Correct answer: C. p16-positive tumors are staged using a separate staging system with different T and N categories
Explanation
AJCC 8th edition introduced separate staging systems for HPV-positive (p16-positive) and HPV-negative oropharyngeal squamous cell carcinoma. The T categories differ (T4 is the highest for HPV-positive, while HPV-negative has T0-T4b), and the N categories are completely different. HPV-positive oropharyngeal cancer has a better prognosis and is staged accordingly, with N1 representing ipsilateral nodes ≤6 cm regardless of number.
Reference: AJCC Cancer Staging Manual, 8th ed.
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