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Human papillomavirus-active head and neck cancer and ethnic health disparities

Authors


  • Winner of the Resident Research Award, Triological Society Southern Section Meeting, Orlando, Florida, U.S.A., February 4–7, 2010.

  • This work was supported by a US Public Health Service Award, CA 95941. William S. Dynan, PhD, is an Eminent Scholar of the Georgia Research Alliance. The authors have no other funding, financial relationships, or conflicts of interest to disclose.

Abstract

Objectives/Hypothesis:

Mortality for black males with head and neck squamous cell carcinoma (HNSCC) is twice that of white males or females. Human papillomavirus (HPV)-active HNSCC, defined by the concurrent presence of high-risk type HPV DNA and host cell p16INK4a expression, is associated with decreased mortality. We hypothesized that prevalence of this HPV-active disease class would be lower in black HNSCC patients compared to white patients.

Study Design:

Multi-institutional retrospective cohort analysis.

Methods:

Real-time polymerase chain reaction was used to evaluate for high-risk HPV DNA presence. Immunohistochemistry for p16INK4a protein was used as a surrogate marker for HPV oncoprotein activity. Patients were classified as HPV-negative (HPV DNA-negative, p16INK4a low), HPV-inactive (HPV DNA-positive, p16INK4a low), and HPV-active (HPV DNA-positive, p16INK4a high). Overall survival and recurrence rates were compared by Fisher exact test and Kaplan-Meier analysis.

Results:

There were 140 patients with HNSCC who met inclusion criteria. Self-reported ethnicity was white (115), black (25), and other (0). Amplifiable DNA was recovered from 102/140 patients. The presence of HPV DNA and the level of p16INK4a expression were determined, and the results were used to classify these patients as HPV-negative (44), HPV-inactive (33), and HPV-active (25). Patients with HPV-active HNSCC had improved overall 5-year survival (59.7%) compared to HPV-negative and HPV-inactive patients (16.9%) (P = .003). Black patients were less likely to have HPV-active disease (0%) compared to white patients (21%) (P = .017).

Conclusions:

The favorable HPV-active disease class is less common in black than in white patients with HNSCC, which appears to partially explain observed ethnic health disparities. Laryngoscope, 2010

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