Objective: To examine patient characteristics, treatment modalities, and human papillomavirus (HPV) prevalence to identify potential mediators of disparities that may lead to differences in outcomes for American Indians with head and neck squamous cell carcinoma (HNSCC).
Study design: Historical cohort study.
Setting: Community cancer centers.
Patients and methods: We reviewed all patients older than 18 years with a new diagnosis of HNSCC in South Dakota from 1999 to 2009. We assessed tissue samples from cases of oropharyngeal cancer for the presence of HPV DNA.
Results: In total, 474 white patients were compared with 32 American Indians. American Indians experienced significantly worse survival compared with whites (hazard ratio [HR], 0.59; P = .05), even after controlling for other factors such as age, sex, distance, Charlson comorbidity index, alcohol abuse, smoking, insurance, and disease stage. American Indians had a greater risk of alcohol abuse (68% vs 42%; P = .008), current smoking (67% vs 49%; P = .03), living more than 1 hour from a cancer center (81% vs 30%; P < .001), lacking private insurance (24% vs 68%; P < .001), and late-stage disease presentation (stages III and IV) (74% vs 55%; P = .04). There were no detected differences in age, sex, medical comorbidities, tumor site, tumor grade, HPV status, time to treatment, or type of treatment received.
Conclusion: American Indians in South Dakota with HNSCC have poorer survival compared with white patients. Once presented to a cancer center, American Indians received nearly identical treatment to white patients. Disparities in outcomes arise primarily due to sociodemographic factors and later stage at presentation.
Keywords: American Indians; disparities; head and neck cancer; human papillomavirus.
© American Academy of Otolaryngology—Head and Neck Surgery Foundation 2014.