Slide 4 
Is a higher magnification showing the malignant epithelial cells extending through the muscularis propria.

Slide 5
Higher magnification of the carcinoma shows it to be composed of diffuse sheets of loosely cohesive, slightly pleomorphic epithelial cells with large nuclear-to- cytoplasmic ratios. This is a poorly differentiated adenocarcinoma in that no glands are formed, but you will notice that some of the cells contain a mucin vacuole that displaces the nucleus to the periphery to form the so-called "signet cell".