LAUSR

e18213 Background: Metastasis is an ominous sign in SCCHN. Human papillomavirus (HPV) infection-associated SCCHN cancers tend to have a distinct prognosis. Factors that are associated with metastatic disease at the time of presentation and diagnosis in patients with HPV-related SCCHN tumors were examined. Methods: NCDB was queried to assess 12,857 patients with HPV-related oropharyngeal carcinomas (HPVOPCA) and 952 patients with HPV related non-oropharyngeal carcinomas (HPVNOPCA) diagnosed between between 2010-2014 with non-missing survival or M stage. Rate of metastases at presentation was analyzed using clinical M stage. Multivariable analysis was performed evaluating race, ethnicity, sex, age, facility location, facility type, insurance status, income, education, urban/rural location, surgery, radiation, and chemotherapy using logistic regression. Results: In both HPVOPCA and HPVNOPCA, over 90% of patients were white. Private insurance was carried by 64% and 47% of patients with HPVOPCA and HPVNOPCA, respectively. HPVOPCA cancer was located in the tonsil in 47% of cases. Patients with HPVOPCA were more likely to present with advanced nodal disease than patients with HPVNOPCA. For both HPVOPCA and HPVNOPCA, there was no meaningful difference in the rate of distant metastasis at presentation in facility type or location, sex, race, Hispanic ethnicity, or urban rural location. For HPVOPCA, there were significantly lower odds of metastasis in privately insured patients vs. uninsured patients (HR: 0.35, 95% CI: 0.21-0.59, p < 0.001), and higher odds of metastasis for those living in census tracts with the lowest rates of high school graduates vs. those living in census tracts with the highest rates of high school graduates (HR: 1.82, 95% CI: 1.07-3.09, p = 0.026). For HPVNOPCA, patients living in census tracts with the lowest rates of high school graduates were less likely to develop metastasis compared to those living in census tracts with the highest rates of high school graduates (p = 0.031). Conclusions: This large retrospective analysis identifies likely modifiable risk factors for metastatic presentation in HPV-related SCCHN. Health policies and educational interventions may result in modifications of these patterns.