Table 4. Summary of Kaplan-Meier Analyses of Potential Prognostic Factors on One-Year Local Control.

LC: local control; 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 LC (95% CI)	p-value
Initial KPS			0.949
< 80%	12 patients	62.50% (95% CI: 22.93 - 86.07%)
≥ 80%	19 patients	41.27% (95% CI: 7.55 - 73.85%)
Tumor Location			0.175
Other Locations	24 patients	65.34% (95% CI: 34.90 - 84.20%)
Oropharynx	7 patients	53.33% (95% CI: 6.83 - 86.31%)
Age			0.379
< 70 years	16 patients	54.73% (95% CI: 20.38 - 79.58%)
≥ 70 years	15 patients	46.67% (95% CI: 7.08 - 80.30%)
GTV			0.792
< 25 cc	5 patients	47.39% (95% CI: 19.45 - 68.43%)
≥ 25 cc	26 patients	51.84% (95% CI: 21.08 - 75.79%)
< 50 cc	8 patients	27.78% (95% CI: 1.00% - 70.04%)	0.700
≥ 50 cc	23 patients	63.92% (95% CI: 32.59 - 83.64%)
Prescription Dose (Five-fraction SBRT)			0.030*
< 40 Gy	19 patients	36.84% (95% CI: 9.67 - 67.98%)
≥ 40 Gy	12 patients	75.00% (95% CI: 22.48 - 91.83%)