With colon cancer, the initial stage, which is Stage 0, is found in the epithelial tissue of the innermost lining of the colon. Here, doctors find cells that are abnormal but have not yet mobilized into full-blown cancer. To treat this stage, doctors will perform a polypectomy, which is a local excision to remove the tumor and surrounding tissue. This treatment is usually considered curative and often no further problems develop if caught early during colon cancer screening tests.

In Stage I, the cancer has spread beyond the innermost layer to the second and third layers, as well as the inside wall of the colon. According to the National Cancer Institute’s most recent data (1991 to 2000), there is a 93% survival rate for colon cancer patients with Stage I cancer.

As the stages of colon cancer progress, the undetected carcinoid tumors are allowed to fester, expand and spread out. Soon they eat their way through the middle layers of the colon into tissues around the rectum and the outermost colon layers. This is known as Stage II-A, which offers an 85% survival rate if detected. Similarly, Stage III-A, which involves cancer that has spread through the wall and affected three disease-fighting lymph nodes, offers an 83% survival rate if caught right away. Once the cancer has reached the bowels, uterus, prostate, bladder and other organs, such as in Stages II-B and III-C, the survival rate declines to 72% and 44%, respectively.

The fourth and last stage of colon cancer is the most deadly, with just an 8% survival rate. By this time, most patients have metastatic colon cancer, which means the tumors and abnormal cell growths have migrated through lymph nodes to other larger organs, like the liver and the lungs.

If detected early, colon polyps can be easily removed during a colonoscopy or a minimally invasive laparoscopic surgical procedure. During Stages II and III, parts of the colon may need to be removed and reattached. Often chemotherapy and radiation therapy are recommended as complimentary therapies to surgery in the later stages as well.

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