Mucinous Carcinoma of Breast : Types A and B
Some authors have proposed subclassification of mucinous carcinomas into types A and B. Type A mucinous carcinomas have more abundant extracellular mucin and are seen in younger patients. Type B tumors show neuroendocrine differentiation and have less abundant extracellular mucin than type A tumors. There are no significant clinical or prognostic differences between the two groups and it is not necessary to differentiate between the two in pathology reports at this time.