Table 3. Summary of Kaplan-Meier Analyses of Potential Prognostic Factors on One-Year Overall Survival.

OS: overall survival; CI: confidence interval; KPS: Karnofsky performance status; GTV: gross tumor volume; SBRT: stereotactic body radiation therapy; cc: cubic centimeters

Variable	Number of Patients	1-year OS (95% CI)	p-value
Initial KPS			0.315
< 80%	15 patients	35.71% (95% CI: 13.03 - 59.44%)
≥ 80%	30 patients	39.25% (95% CI: 20.26 - 57.82%)
Tumor Location			0.202
Other Locations	35 patients	42.66% (95% CI: 25.26 - 59.00%)
Oropharynx	10 patients	15.43% (95% CI: 0.77 - 48.83%)
Age			0.725
< 70 years	25 patients	38.79% (95% CI: 22.07 - 55.24%)
≥ 70 years	20 patients	29.17% (95% CI: 4.23 - 61.88%)
GTV
< 25 cc	9 patients	25.93% (95% CI: 3.89 - 57.04%)	0.698
≥ 25 cc	36 patients	40.67% (95% CI: 23.31 - 57.35%)
< 50 cc	14 patients	39.68% (95% CI: 14.78 - 63.96%)	0.598
≥ 50 cc	31 patients	36.71% (95% CI: 18.67 - 54.97%)
Prescription Dose (Five-fraction SBRT)			0.028*
< 40 Gy	31 patients	23.64% (95% CI: 9.66 - 41.07%)
≥ 40 Gy	14 patients	67.79% (95% CI: 34.92 - 86.53%)