MUC5AC and gastric tubular adenocarcinoma: We have also reported that intramucosal histologically mixed-type LG-tub1 lesions, which predominantly consist of LG-tub1s, minor high-grade (HG) tub1s and/or minor moderately differentiated tubular adenocarcinomas (tub2s) and/or (a) minor undifferentiated component(s), have larger mean diameters and exhibit a higher frequency of a gastric mucin phenotype (G-phenotype) than pure LG-tub1 lesions; thus, they may be primitive lesions that precede malignant transformation [8].