Overall survival (OS) was calculated as time from diagnosis to time to death. The number at risk is delineated above the x axis at each time point. Kaplan-Meier estimates for median OS were 13.3 months (95%CI: 12.7–14.0), 11.9 months (95%CI: 11.2–12.7), and 2.5 months (95%CI: 2.4–2.6) for patients treated with concurrent chemoradiation, definitive radiation alone, and no treatment respectively (p<0.01). 5-year OS estimates were compared using log-rank tests, with rates of 10.1% (95%CI: 9.0–11.3), 5.7% (95%CI: 4.3–7.5), and 1.5% (95%CI: 1.2–1.8) for patients treated with concurrent chemoradiation, definitive radiation alone, and no treatment respectively (p<0.01).