Table 4.

Multivariate overall survival analysis (N=28, # events=26, 7% censored).

	HR (95% CI)	P-Value
Age at ATC diagnosis (years)	1.079 (1.022 -1.139)	0.006
Receipt of EBRT
No EBRT	Reference
EBRT	0.174 (0.050 - 0.613)	0.007
Receipt of surgery
No surgery	Reference
Surgery	0.198 (0.065 - 0.598)	0.004
Receipt of chemotherapy
No chemotherapy	Reference
Chemotherapy	0.668 (0.274 - 1.633)	0.38

Hazard ratios and confidence intervals are from a Cox proportional hazards model, with p-values calculated by a Wald chi-square test.

HR = hazard ratio; CI = confidence interval; EBRT = external beam radiation therapy.