Changing prognosis of oral cancer: An analysis of survival and treatment between 1973 and 2014

Objectives/hypothesis: Oral cavity cancer is the most commonly occurring malignancy of the head and neck. There are limited data suggesting a change in prognosis of oral cavity cancers. We aimed to evaluate temporal trends in demographics, treatment, and prognosis of oral cavity cancer diagnosed between 1973 and 2014 inclusive.

Study design: Retrospective database analysis.

Methods: A retrospective study of 16,030 adult patients diagnosed with oral cavity cancer between 1973 and 2014 inclusive and treated surgically in the Surveillance, Epidemiology, and End Results (SEER) 9 registry was conducted. A supplemental analysis was conducted using data from the National Cancer Database. Multivariate Cox survival regressions and univariate Kaplan-Meier analyses were conducted.

Results: The prognosis of both early- and late-stage disease has significantly improved between 1973 and 2014. Among patients with early-stage disease, 3-year survival increased from 78.0% (standard error [SE] = 1.3) for those diagnosed from 1973 to 1980 to 92.2% (SE = 1.1) for those diagnosed from 2011 to 2014. Among patients with late-stage disease, 3-year survival ranged from 51.9% (SE = 1.5) for those diagnosed from 1973 to 1980 to 70.3% (SE = 1.9) for those diagnosed from 2011 to 2014. For patients with late-stage disease, this improved prognosis occurred in tandem with increasing usage of chemoradiotherapy as adjuvant therapy. There has also been increasing utilization of neck dissection for early- and late-stage disease, along with higher nodal yields from performed dissections.

Conclusions: The prognosis of oral cavity cancer has improved significantly from the early 1970s to recent years. In late-stage oral cancer, this change has been associated with an increased use of adjuvant therapy and adjuvant chemoradiotherapy in particular.

Level of evidence: 4 Laryngoscope, 128:2762-2769, 2018.