Table III.

Risk factors for cancer-specific survival by univariate and multivariate analyses of Cox proportional hazards model.

	Univariate analysis	Multivariate analysis
Factors	P-value	P-value	HR	95% CI
Cachexia (positive)	<0.0001	0.014	6.29	1.48–28.37
T stage (T3–4)	0.0003	0.21	2.52	0.58–10.35
Tumor necrosis (positive)	0.002	0.644	1.46	0.29–7.45
Grade (G3)	0.0032	0.981	1.02	0.16–6.39
Metastasis (N+ and/or M+)	<0.0001	0.023	4.71	1.23–23.76
DHA level (lower than median)	0.0051	0.033	4.43	1.11–30.25

HR, hazard ratio; CI, confidence interval; DHA, docosahexaenoic acid.