HPV Status of Oropharyngeal Cancer by Combination HPV DNA/p16 Testing: Biological Relevance of Discordant Results
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Background and Purpose
Human papillomavirus (HPV) causes up to 70 % of oropharyngeal cancers (OSCC). HPV positive OSCC has a more favorable outcome, thus HPV status is being used to guide treatment and predict outcome. Combination HPV DNA/p16ink4 (p16) testing is commonly used for HPV status, but there are no standardized methods, scoring or interpretative criteria. The significance of discordant (HPV DNA positive/p16 negative and HPV DNA negative/p16 positive) cancers is controversial. In this study, 647 OSCCs from 10 Australian centers were tested for HPV DNA/p16 expression. Our aims are to determine p16 distribution by HPV DNA status to inform decisions on p16 scoring and to assess clinical significance of discordant cancers.
HPV DNA was identified using a multiplex tandem HPV E6 polymerase chain reaction (PCR) assay and p16 expression by semiquantitative immunohistochemistry.
p16 distribution was essentially bimodal (42 % of cancers had ≥70 % positive staining, 52 % <5 % positive, 6 % between 5 and 70 %). Cancers with 5 to <50 % staining had similar characteristics to the p16 negative group, and cancers with 50 to <70 % staining were consistent with the ≥70 % group. Using a p16 cut-point of 50 %, there were 25 % HPV DNA positive/p16 negative cancers and 1 % HPV DNA negative/p16 positive cancers. HPV DNA positive/p16 negative cancers had outcomes similar to HPV DNA negative/p16 negative cancers.
50 % is a reasonable cut-point for p16; HPV DNA positive/p16 negative OSCCs may be treated as HPV negative for clinical purposes; HPV DNA/p16 testing may add no prognostic information over p16 alone.
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- HPV Status of Oropharyngeal Cancer by Combination HPV DNA/p16 Testing: Biological Relevance of Discordant Results
Annals of Surgical Oncology
Volume 20, Issue 3 Supplement, pp 450-458
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- Springer US
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- Author Affiliations
- 1. Department of Radiation Oncology, Royal Prince Alfred Hospital, Sydney, NSW, Australia
- 2. Sydney Medical School, The University of Sydney, Sydney, NSW, Australia
- 3. Department of Infectious Diseases and Immunology, Central Clinical School, The University of Sydney, Sydney, NSW, Australia
- 4. NHMRC Clinical Trials Centre, The University of Sydney, Sydney, NSW, Australia
- 5. Discipline of Pathology, School of Medicine, University of Western Sydney, Sydney, NSW, Australia
- 6. Department of Anatomical Pathology, Liverpool Hospital, Sydney, NSW, Australia
- 7. Cancer Pathology, Bosch Institute, The University of Sydney and Dept of Anatomical Pathology, Royal Prince Alfred Hospital, Sydney, NSW, Australia
- 8. Sydney Head and Neck Cancer Institute, Royal Prince Alfred Hospital, Sydney, NSW, Australia
- 9. Pathwest Laboratory Medicine, QEII Medical Centre, Nedlands, Perth, WA, Australia