Table 1.

Descriptive Statistics for Patients Resected for Pancreatic Adenocarcinoma

Patient Characteristics	Preoperative CA19-9 (n = 176)		Pre- and Postoperative CA19-9 (n = 111)
	No.	%	No.	%
Preoperative factors
Age at operation, years
Minimum	33.8		33.8
Median	68.7		66.8
Mean	66.9		65.5
Maximum	91.0		91.0
Female	99	56	55	50
Abdominal pain	109	62	71	64
Weight loss	105	60	68	61
Diabetes	31	18	16	14
Smoker	90	55	61	57
Jaundice	105	60	62	56
ERCP	137	78	83	75
Stent	103	59	61	55
Tumor biopsy
Not performed	112	64	69	62
Percutaneous	13	7	9	8
EUS guided	43	24	27	24
ERCP guided	8	5	6	5
Operative factors
Tumor location
Head	136	77	84	76
Body	18	10	11	10
Tail	22	13	16	14
Type of resection
Whipple	137	78	86	77
Distal	32	18	21	19
Total	7	4	4	4
Portal vein resected	7	4	5	5
Pylorus preserving	14	8	12	11
Splenectomy	23	13	16	14
Blood transfusion	51	29	32	29
Pathologic factors
Margin of resection
Negative, overall	137	78	88	79
Positive	39	22	23	21
Cytology
Positive	5	3	4	4
Negative	42	24	33	30
Not performed	129	73	74	67
Differentiation
Not assessed	8	5	3	3
Well differentiated	10	6	7	6
Moderately differentiated	97	55	63	57
Poorly differentiated	60	35	38	34
Tumor stage
T1	19	11	11	10
T2	29	16	16	14
T3	128	73	84	76
Node stage
N0	77	44	45	41
N1	99	56	66	59
Perineural invasion	127	72	81	73
Vascular invasion	57	32	37	33
Lymphatic Invasion	77	44	53	48
AJCC stage	32	18	18	16
IIa	44	25	26	23
IIb	98	56	65	59
IV	2	1	2	2
Adjuvant therapy
Preoperative chemotherapy	10	6	7	6
Postoperative chemotherapy	112	64	87	78
Preoperative XRT	46	26	35	32
Intraopertive XRT	18	10	14	13
Postoperative XRT	97	55	72	65

Abbreviations: ERCP, endoscopic retrograde cholangiopancreatography; EUS, endoscopic ultrasound; AJCC, American Joint Committee on Cancer; XRT, radiation therapy.