Table 2:

Immunophenotypic features and mucin histochemical characterization of mixed ovarian borderline tumors and carcinomas with gastrointestinal-type mucinous and Mullerian epithelial components

Case #	Component (predominant cell type)	CK7	CK20	ER	PR	Pax8	CDX2	MUC6	WT1	ARID1A	AB/PAS
MO-1	Mucinous (intestinal>gastric)	+++	++	−	−	−	++	+	−	Loss	neutral/acidic
	Mullerian (endometrioid)	+++	−	+++	+++	++	−	−	+	Loss	No intracellular mucin
MO-2	Mucinous (gastric)	+++	+	−	−	+	−	−	−	Loss	Neutral
	Mullerian (endometrioid)	+++	−	+	+++	++	−	−	−	Subclonal loss	No intracellular mucin
MO-3	Mucinous (gastric>intestinal)	+++	++	−	−	++	++	−	−	Intact	Mixture (neutral>acidic)
	Mullerian (endometrioid/clear cell)	+++	−	++	++	+++	−	−	−	Intact	Only rare cells with mucin (acidic)
MO-4	Mucinous (gastric>intestinal)	+++	+	+	−	+	+	++	−	Loss	Mixture (neutral>acidic)
	Mullerian (endometrioid/clear cell)	+++	−	++	−	++	−	−	−	Loss	No intracellular mucin

Immunohistochemistry results reported as follows:

⁻, negative;

⁺, focal/weak positive;

⁺⁺moderate/patchy positive;

⁺⁺⁺, strong/diffuse positive.