MUC1 and tubular adenocarcinoma: Increased expression of MUC1 in BilIN (MUC2−/CK7+/CK20− pattern) and IPNB (MUC2+/CK7+/CK20+) is associated with tubular adenocarcinoma, while colloid carcinoma in IPNB is characterized by MUC1-negativity and less advanced pathologic stages [86].