MUC7 and invasive ductal breast carcinoma: Carrara et al. found that the prevalence of MUC7 in ductal adenocarcinoma was 73.0% [27]; MUC7 expression was highly significant for adenocarcinoma (P = 0.007) and borderline for intraductal papillary mucinous neoplasm (IPMN) (P = 0.05).