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  • Title: Interaction of quantitative (18)F-FDG-PET-CT imaging parameters and human papillomavirus status in oropharyngeal squamous cell carcinoma.
    Author: Schouten CS, Hakim S, Boellaard R, Bloemena E, Doornaert PA, Witte BI, Braakhuis BJ, Brakenhoff RH, Leemans CR, Hoekstra OS, de Bree R.
    Journal: Head Neck; 2016 Apr; 38(4):529-35. PubMed ID: 25352335.
    Abstract:
    BACKGROUND: Patients with human papillomavirus (HPV)-positive oropharyngeal squamous cell carcinoma (SCC) have a better survival than with HPV-negative oropharyngeal SCC. An (18) F-fluorodeoxyglucose positron emission tomography-CT ((18) F-FDG-PET-CT) may also provide prognostic information. We evaluated glycolytic characteristics in HPV-negative and HPV-positive oropharyngeal SCC. METHODS: Forty-four patients underwent pretreatment (18) F-FDG-PET-CT. Standardized uptake values (SUVs) and metabolic active tumor volumes (MATVs) were determined for primary tumors. HPV status was determined with p16 immunostaining, followed by high-risk HPV DNA detection on the positive cases. RESULTS: Twenty-seven patients were HPV-positive (61.4%). Median MATV was 2.8 mL (range = 1.6-5.1 mL) for HPV-positive and 6.0 mL (range = 4.4-18.7 mL) for HPV-negative tumors (p < .001). SUV values are volume dependent (partial volume effect), therefore, MATV was included as covariate in multivariate analysis. In this multivariate analysis, the maximum SUV in HPV-positive tumors was 3.9 units lower than in HPV-negative tumors (p = .01). CONCLUSION: The (18) F-FDG-PET-CT parameters are lower in HPV-positive than in HPV-negative patients. Low pretreatment SUV values in HPV-positive oropharyngeal SCC may be at least partly explained by HPV-induced tumor changes.
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