Test Details: Immunohistochemical testing is carried out on biopsy/resected tissue specimen. This testing helps to identify specific antigens (proteins) within tissue sections utilizing an antigen-specific antibody Epithelial mucin expressed in intestinal goblet cells and airway epithelium. Positive staining is seen in intestinal and airway epithelium, mucinous carcinoma of colon, breast, pancreas, ovary and colon.