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Conditional survival among patients with oropharyngeal cancer treated with radiation therapy and alive without recurrence 5 years after diagnosis
Author(s) -
Dahlstrom Kristina R.,
Song Juhee,
Thall Peter F.,
Fuller Clifton D.,
Hutcheson Katherine A.,
Johnson Faye M.,
Gunn G. Brandon,
Phan Jack,
Frank Steven J.,
Morrison William H.,
Ferrarotto Renata,
Rosenthal David I.,
Sturgis Erich M.,
Garden Adam S.
Publication year - 2021
Publication title -
cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.052
H-Index - 304
eISSN - 1097-0142
pISSN - 0008-543X
DOI - 10.1002/cncr.33370
Subject(s) - medicine , radiation therapy , cancer , cancer recurrence , surgery
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.