Table 4.

SEER^b COX regression hazard ratios, by treatment.

Treatment Modality	Hazard Ratio	(95% CI)a	P value
No Surgery, No Radiation	Reference
Surgery alone	1.07	0.90–1.27	0.09
Radiation alone	4.39∗	1.94–9.94	<0.01
Surgery, Radiation	1.09	0.91–1.30	0.12
SEERbCOX Regression Hazard Ratios, by Treatment and Subtype
No Surgery, No Radiation	Reference
Surgery alone
Well-differentiated	0.94	0.63–1.42	0.90
De-differentiated	0.99	0.74–1.34	0.97
Mixed	1.20	0.59–2.51	0.63
Myxoid	1.18	0.84–1.68	0.34
Round cell	0.84	0.34–2.12	0.89
Pleomorphic	1.20	0.77–1.87	0.43
Radiation alone
Well-differentiated	3.11	0.84–10.15	0.99
De-differentiated	3.95∗	1.23–12.66	0.02
Mixed	–	–	–
Myxoid	11.12∗	3.45–36.40	<0.01
Round cell	–	–	–
Pleomorphic	2.73	0.67–4.15	0.94
Surgery, Radiation
Well-differentiated	0.96	0.62–1.47	0.84
De-differentiated	0.89	0.65–1.21	0.45
Mixed	1.46	0.69–3.10	0.32
Myxoid	1.19	0.83–1.71	0.34
Round cell	1.06	0.42–2.68	0.90
Pleomorphic	1.19	0.75–1.88	0.46

∗indicates significance, blank value indicates incomplete/missing data.

^bSurveillance, Epidemiology, and End Results Program Database.

^aConfidence Interval.