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Colorectal cancer refers to cancer that develops in the colon or rectal areas of the digestive system. Excluding skin cancers, colorectal cancer is the third most commonly diagnosed form of cancer in American men and women and the second leading cause of cancer-related deaths. Fortunately, the number of deaths attributed to colorectal cancer has been dropping over the past 20 years, most likely due to increased screening and improved treatment.
The colon is an approximately five-foot long muscular tube where food is digested, nutrients are absorbed and stool is formed. Waste matter then goes into the rectum, the last six inches of the digestive system, before passing out of the body through the anus. The wall of the colon and rectum has several layers of tissue. Cancer can develop in the innermost layer and then grow through some or all of the other layers.
Before cancer starts, an abnormal growth of tissue or tumor begins as a non-cancerous polyp on the lining of the colon or rectum. There are several types of polyps. Hyperplastic and inflammatory polyps usually do not become pre-cancerous. Adenomatous polyps may potentially become cancerous over the course of several years. Once cancer begins to develop, it can grow into the wall of the colon or rectum and then spread into blood or lymph vessels.
Most people with colorectal cancer do not know they have the disease because they have no symptoms until the cancer reaches an advanced stage. Common warning signs of colorectal cancer include a change in bowel habits (diarrhea or constipation), a feeling that bowels do not empty completely, blood in the stool, stools that are more narrow than usual, gas pains, cramps or bloating, unexplained weight loss, weakness or fatigue, and nausea or vomiting. However, these symptoms also may be caused by other conditions, such as infection, hemorrhoids or inflammatory bowel disease. A person with symptoms should see a doctor for diagnosis and treatment as soon as possible. Successful treatment is more likely when colorectal cancer is detected early.
Screening tests to detect colorectal cancer include:
Fecal occult blood test to check stool for small amounts of blood
Sigmoidoscopy to examine the lower part of the colon
Colonoscopy to view the large intestine and take tissue samples
Barium enema to take X-ray pictures of the colon and rectum
Doctors recommend an initial colonoscopy at age 50. Generally, this screening test is repeated every 10 years. People at higher risk of developing colorectal cancer may need to begin screening at an earlier age.
Once the diagnosis of colorectal cancer has been made, treatment will depend on the tumor location and stage of the disease. The most common treatment for colorectal cancer is surgery, which may involve removing a section of the colon or rectum and then reconnecting the healthy parts. Chemotherapy may be administered to kill cancer cells throughout the body. Radiation therapy can be recommended to target cancer cells only in the affected area.
When detected and treated at an early stage, the five-year survival rate for colorectal cancer is more than 90 percent. Screening is recommended to detect polyps before they become cancerous for people who are age 50 or older, have a family or personal history of the condition, or eat a diet high in fat. For more information about colorectal cancer, visit the American Cancer Society website at www.cancer.org.
For more information about colorectal cancer, check with your doctor or call 877-874-5933 for a free referral to a physician near you.