MUC5AC and adenocarcinoma: In the LB group 3/7 (43%) samples were mucinous adenocarcinomas (extracellular mucin > 50% of the tumor volume), 2/7 samples (29%) were adenocarcinomas with mucinous features (mucin 10–50%), 1/7 (14%) was a signet ring cell adenocarcinoma.