BCL2 and mucinous neoplasm: In both of the serous and mucinous tumors, the Bcl-2 staining score did not differ among the benign, borderline, and malignant histological types (Figure 1k-m) (p > 0.05) There was no significant difference between the serous and mucinous tumors with regard to the Bcl-2 staining score (p > 0.05).