1a1) Intraluminal Tumor Cells (ILTCs) attached to the epithelium of the mucosa of the tube (Hematoxylin and Eosin ×400 and insert ×100), 1a2) ILTCs floating in the lumen (Hematoxylin and Eosin ×400 and insert ×100), 1b1) ILTCs size less than 10 cells (Hematoxylin and Eosin ×400), 1b2) ILTCs size 10–50 cells (Hematoxylin and Eosin ×400), 1b3) ILTCs size greater than 50 cells (Hematoxylin and Eosin ×400), 1c1) ILTCs associated with stroma (Hematoxylin and Eosin ×100), and 1c2) ILTCs unassociated with stroma (Hematoxylin and Eosin ×100).