Adenocarcinoma (specific types)

M-814 in ICD-O-3 denotes adenocarcinoma, malignant tumors of epithelial origin that form glandular structures, and includes a variety of specific subtypes such as mucinous, papillary, tubular and signet-ring cell forms. These neoplasms are characterized by gland-like differentiation and production of mucin or other secretions, and are recorded separately from generic adenocarcinoma categories.