NCI: Cancer that forms in the tissues of the colon (the longest part of the large intestine). Most colon cancers are adenocarcinomas (cancers that begin in cells that make and release mucus and other fluids).,NCI: A malignant epithelial neoplasm that arises from the colon and invades through the muscularis mucosa into the submucosa. The vast majority are adenocarcinomas.
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