Table I.

Immunohistochemical markers for IPMN/IOPN/ITPN classification.

Type of lesion	Subtype	MUC1	MUC2	MUC5AC	MUC6	CDX2
IPMN	G	negative	negative	positive	negative	negative
	PB	positive	negative	positive	positive	negative
	INT	negative	positive	positive	negative	positive
IOPN		positive	negative	positive	positive	negative
ITPN		positive	negative	negative	positive	negative

Abbreviations: IPMN: intraductal papillary mucinous neoplasm; IOPN: intraductal oncocytic papillary neoplasm; ITPN: intraductal tubulo-papillary neoplasm; G: gastric; PB: pancreatic-biliary; INT: intestinal.

Note: if the positivity of a marker is very intense at the immunohistochemical level and very important for diagnostic purposes, it is indicated in bold.