How are glandular epithelial tumors?

Frequent tumors, hollow organs and parenchyma, benign or malignant Benign (adenomas [very differentiated, single mass rounded capsulated, can be cystadenoma, homogenous w/surrounding]) Malignant (Adenocarcinoma [mucosal, exocrine tubular, endocrine resemble normal gland]) Notion of differentiation (good proliferation resembles original tissue, bad absent characters on HE but demonstrated by histochemsitry/ IHC