Colon Cancer Essay

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Colon Cancer
What is the disease?
Colon and rectal cancer develop in the digestive tract, which is also called the gastrointestinal, or GI, tract. The digestive system processes food for energy and rids the body of solid waste matter (fecal matter or stool). Colon cancer and rectal cancer have many features in common. Sometimes they are referred to together as colorectal cancer.
Over 95% of colorectal cancers are ad enocarcinomas. These are cancers of the glandular cells that line the inside of the colon and rectum. Other, less common type of tumors may also develop in the colon and rectum. Carcinoid tumors develop from hormone-producing cells of the intestine. Gastrointestinal stromal tumors develop in the connective tissue and muscle
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Knowing a little about these layers is important, because the stage (extent of spread) of a colorectal cancer depends to a great degree on which of these layers it affects.
What organs does the disease affect and what are their actions?
·     Stage 0. The cancer is very early. It is found only in the innermost lining of the colon or rectum.
·     Stage I. The cancer involves more of the inner wall of the colon or rectum.
·     Stage II. The cancer has spread outside the colon or rectum to nearby tissue, but not to the lymph nodes.
·     Stage III. The cancer has spread to nearby lymph nodes, but not to other parts of the body.
·     Stage IV. The cancer has spread to other parts of the body. Colorectal cancer tends to spread to the liver and/or lungs.
·     Recurrent. Recurrent cancer means the cancer has come back after treatment. The disease may recur in the colon or rectum or in another part of the body.
The organs and their purpose are best described in the following example of the digestive system and the functions of the intestines, colon and rectum. After food is chewed and swallowed, it travels through the esophagus to the stomach. There it is partly broken down and then sent to the small intestine, also known as the

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