Table 5.

Senstivity and specificity of cancer antigen (CA)19‐9 for pancreatic ductal adenocarcinoma (PDAC)

	PDAC	Chronic pancreatitis	IPMN	Noncancer
Objective number	53	22	23	102
Result
Positive	38 (71.7%)	2 (9.1%)	2 (8.7%)	3 (2.9%)
Negative	15 (28.3%)	20 (90.9%)	21 (91.3%)	99 (97.1%)
Sensitivity
Point estimation	71.7%	—	—	—
95% CI	57.7%‐83.2%	—	—	—
Specificity
Point estimation	—	90.9%	91.3%	97.1%
95% CI	—	70.8%‐98.9%	72.0%‐98.9%	91.6%‐99.4%

—, not applicable; CI, confidence interval; IPMN, intraductal papillary mucinous neoplasm.