MUC5AC and adenocarcinoma: The histopathological findings of the three cases with EML4-ALK-V3a fusion are micropapillary adenocarcinoma with mucin, mixed solid (with signet ring cell) and acinar (cribriform pattern with mucin) adenocarcinoma and mixed papillary, solid (with signet ring cell) and acinar (cribriform pattern with mucin) adenocarcinoma, respectively.