MUC6 and pancreatic neuroendocrine tumor: Among the 16 tumor entities for which MUC6 expression had not been previously reported there were several clinically relevant tumor types such as for example serous and endometrioid ovarian carcinomas, neuroendocrine tumors of the pancreas, small cell neuroendocrine carcinomas of the prostate and the urinary bladder, as well as testicular yolk sac tumors.