Lymph node ratio is an independent prognostic factor for patients after resection of pancreatic cancer

Table 1 Univariate analysis of factors predictive of poor overall survival

Variables	Case number ( n )	Univariate analysis
Variables	Case number ( n )	Overall survival (median ± SE, months)	1-year survival rate (%)	P value
Sex				0.041
Male	53	15 ± 3.4	54.5
Female	30	54 ± 11.0	65.9
Age(years old)				0.718
<65	50	20 ± 9.6	62.0
≥65	33	33 ± 15.9	53.2
Diabetes				0.168
No	74	23 ± 10.8	61.9
Yes	9	10 ± 1.5	33.3
Locations				0.353
Head	52	31 ± 14.8	63.1
Body-tail	31	15 ± 4.7	51.6
Tumor size (cm)				0.606
≤3	12	20 ± 7.4	63.6
>3	70	23 ± 11.0	57.3
Differential degree^a				0.039
High/moderate	55	33 ± 12.8	66.3
Low	22	10 ± 1.4	40.8
Tumor staging				0.664
T1/T2	69	18 ± 9.6	57.3
T3/T4	14	23 ± 13.7	64.3
Lymph node staging				0.041
N0	53	33 ± 14.1	69.0
N1	30	11 ± 1.3	39.7
TNM staging				0.014
I/II	41	54 ± 15.5	72.1
III/IV	42	11 ± 3.1	45.5
Perineuronal invasion				0.082
No	48	43 ± 22.8	69.4
Yes	35	11 ± 1.0	44.4
LNR				0.001
≤0.2	66	33 ± 13.6	69.0
>0.2	17	8 ± 1.1	13.8
Total number of examined LNs				0.062
<12	61	15 ± 4.3	53.4
≥12	22	55 ± None^b	74.9

^aThe differential degree of six cases is not recorded. ^bNone: if the number of censored data is more than 50% of the total, median survivals cannot be calculated by SPSS. LN, lymph node; SE, standard error.

ISSN: 1477-7819