Conditional survival among patients with oropharyngeal cancer treated with radiation therapy and alive without recurrence 5 years after diagnosis.

Background: Risk of recurrence among patients with oropharyngeal cancer (OPC) who survive 5 years is low. The goal of this study was to assess long‐term survival of patients with OPC alive without recurrence 5 years after diagnosis. Methods: This study included newly diagnosed patients with OPC, who had been treated with radiation and were alive without recurrence 5 years after diagnosis. Overall survival (OS) probabilities beyond 5 years were estimated using the Kaplan‐Meier method. Factors associated with OS were determined using Bayesian piecewise exponential survival regression. Standardized mortality ratios for all‐cause death were estimated controlling for study year, age, and sex in the US general population. Results: Among 1699 patients, the additional 2‐year, 5‐year, and 10‐year OS probabilities were 94%, 83%, and 63%, respectively, and were lower than those in the general population. Patients who were older, were current or former smokers, had other than tonsil or base of tongue tumors, or had T4 tumors had a higher risk of death. Patients who had base of tongue tumors and had received intensity‐modulated radiation therapy (IMRT) or lower‐radiation doses had a lower risk of death. Standardized mortality ratios were higher among current and heavy smokers and lower among recipients of IMRT and lower radiation doses. Conclusions: In this large cohort, long‐term survival among patients with OPC was good but lower than predicted for the general population. Patients treated with IMRT and those with less tobacco exposure had better outcomes. Long‐term survival of 1699 patients with oropharyngeal cancer alive and recurrence‐free 5 years after diagnosis was good but lower than the general population. Patients treated with intensity‐modulated radiation therapy and those with less tobacco exposure had better outcomes. [ABSTRACT FROM AUTHOR]
Copyright of Cancer (0008543X) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)