<prompt> The Astler-Coller modification of the Dukes classification is used to classify cancers of theLiverColonLungStomach  <response>: Colon cancer may be found in the left side of the colon producing a napkin ring or apple core appearance or the right side of the colon producing a polypoid mass. In either location, bleeding may produce an iron-deficiency anemia. Histologically, the vast majority of colon cancers are adenocarcinomas. Currently the most common classification used to stage colon carcinomas is the Astler-Coller modification of the Dukes classification of colon cancer. This classification is as follows: A mucosa or submucosa, arbitrary; B1 into muscularis propria; B2 through muscularis propria; C1 into muscularis propria with lymph node metastasis; C2 through muscularis propria with lymph node metastasis; D distant spread. Reference: Robbins Cotran Pathologic Basis of Disease, 9edition 