Prognostic value of lymph nodes count on survival of patients with distal cholangiocarcinomas

Table 1 Characteristics of patients and tumors

Variable	No. of patients, n (%) n = 449
Race
White	321 (71.5)
Black	35 (7.8)
Other	93 (20.7)
Sex
Male	286 (63.7)
Female	163 (36.3)
Age at diagnosis, in yr
≤ 60	128 (28.5)
60-70	171 (38.1)
> 70	150 (33.4)
Marital status
Married	302 (67.3)
Divorced	33 (7.3)
Separated or single	58 (12.9)
Widowed	40 (8.9)
Unknown	16 (3.6)
Year of diagnosis
2004-2010	110 (24.5)
2011-2012	160 (35.6)
2013-2014	179 (39.9)
Tumor size, in mm
≤ 20	203 (45.2)
20-50	191(42.5)
> 50	15 (3.3)
Unknown	40 (8.9)
Grade
Well differentiated	54 (12.0)
Moderately differentiated	204 (45.4)
Poorly differentiated	158 (35.2)
Undifferentiated	3 (0.7)
Unknown	30 (6.7)
Stage
IA	44 (9.8)
IB	60 (13.7)
IIA	89 (19.8)
IIB	161 (35.9)
III	95 (21.2)
T stage
T1	49 (10.9)
T2	85 (18.9)
T3	220 (49.0)
T4	95 (21.2)
pN stage
pN0	226 (50.3)
pN1	223 (49.7)
Surgery type
Local excision	102 (22.7)
Extensive surgery	347 (77.3)
Adjuvant radiotherapy
No/Unknown radiotherapy	298 (66.3)
Beam radiation	151 (33.7)
Adjuvant chemotherapy
No/Unknown chemotherapy	204 (45.4)
Chemotherapy performed	245 (54.6)
No. of LNs retrieved
1-10	196 (43.7)
11-20	151 (33.6)
> 20	102 (22.7)

LNs: Lymph nodes.