Treatment options in patients with pancreatic cancer: A 10-year multicenter epidemiological investigation in China

Table 1 Distribution of basic demographic characteristics

Characteristic		Case	%
Age at first diagnosis, year
	< 55	549	30.90
	55-64	601	33.80
	65-74	444	25.0
	≥ 75	181	10.10
Sex
	Male	2037	62.56
	Female	1217	37.38
BMI
	< 18.5	197	16.54
	18.5-23.9	721	60.54
	> 23.9	273	22.92
History of pancreatitis
	No	2706	95.90
	Yes	114	4.10
History of intestinal flora disorders
	No	2428	96.30
	Yes	93	3.70
Family history of pancreatic malignancy
	No	2689	98.57
	Yes	39	1.43
Diabetes mellitus
	No	2601	84.50
	Yes	477	15.50
Smoking
	Never	2163	70.18
	Ever	364	11.81
	Now	555	18.01
Alcohol drinking
	Never	2314	75.25
	Ever	296	9.62
	Now	465	15.12
Staging of pancreatic cancer
	Ⅰ	373	15.70
	Ⅱ	358	15.00
	Ⅲ	295	12.40
	Ⅳ	1354	56.90
Differentiation degree
	Well	160	15.14
	Moderately	431	40.78
	Poorly	466	44.09
Surgery
	Yes	2134	66.80
	No	1063	33.20
Surgical margin
	Negative	673	80.00
	Positive	169	20.00
No. of lymph node metastasis
	0	941	73.60
	1-3	270	21.10
	> 3	68	5.30
Chemotherapy
	Yes	1076	39.73
	No	1632	60.26
Ki-67
	Not done	1130	84.90
	Positive	193	14.50
	Negative	8	0.60
CK or AE1/AE3
	Not done	1228	85.81
	Positive	191	13.35
	Negative	12	0.84

BMI: Body mass index; CK: Cytokeratin.