Table 6.

Overall survival (OS) according to different variables in univariate and multivariate analysis

Variable	Group	n	Median OS in months (95% CI)	P-value
				Univariate	Multivariate
Age (years)	<50	34	14.1 (11.8–16.5)	0.56	NA
	≥50	26	15.2 (13.3–17.2)
Sex	Female	26	13.4 (7.3–19.5)	0.038	0.018
	Male	34	15.3 (13.2–17.4)
Presurgery volume (cc)	<30	24	15.3 (13.6–17)	0.035	0.032
	30 to <50	22	13 (10.2–15.8)
	≥50	14	12.2 (4.3–20.1)
Surgery extent	Near total	14	15.2 (12.8–17.7)	0.18	0.057
	Subtotal	24	13.4 (10.1–16.7)
	Biopsy	22	14.1 (12.3–16)
Postsurgery residual volume (cc)	≤10	18	15.3 (14.1–16.5)	0.029	0.008
	>10	42	13 (10.3–15.6)
KPS	≤80	46	13.4 (10.9–15.9)	0.073	0.01
	>80	14	17.2 (12.3–22.2)
Posttreatment (radio/chemotherapy) volume	≤10	26	15.3 (13.8–16.8)	0.03	0.031
	>10	34	13 (9.5–16.5)
Treatment arm	I	30	12.3 (7.7–16.9)	0.83	NA
	II	30	14.3 (14–14.7)
Response to treatment	No	40	14.3 (12.3–16.4)	0.89	NA
	Yes	20	14.3 (11.7–16.8)

Abbreviations: CI, confidence interval; NA, not applicable (multivariate [Cox regression] analysis included variables with a P-value ≤0.2 in univariate analysis); KPS, Karnofsky Performance Status.