Colon cancer is cancer of the large intestine (colon), the lower part of your digestive system. Colon cancer is the second most common cancer in the USA with equal distribution between men and women. Colon tumors usually affect people over the age of 40, with the majority of people who are diagnosed with the condition being over 60 years of age. Colon cancer may affect any racial or ethnic group; however, some studies suggest that Americans of northern European heritage have a higher-than-average risk of colon tumours.
INCIDENCE OF COLON CANCER
Colon cancer is more common in industrialized nations and in those societies where red meat is a major part of the diet, although evidence tends to suggest that merely changing your diet to white meat and seafood as in for instance Japan, tends to just swap stomach cancer for colon cancer. In almost all cases colon cancer is a treatable disease if caught early.
SIGNS AND SYMPTOMS
Colon cancer usually begins with the appearance of benign growths such as polyps. Often there are no early symptoms. If signs and symptoms of colon cancer do appear, they may include: a change in your bowel habits, including diarrhea or constipation or a change in the consistency of your stool for more than a couple of weeks, rectal bleeding or blood in your stool, persistent abdominal discomfort, such as cramps, gas or pain, abdominal pain with a bowel movement, a feeling that your bowel doesn't empty completely, weakness or fatigue and unexplained weight loss.
CAUSES OF COLON CANCER
Colon cancer's exact cause is unknown, but it appears to be influenced by both inherited and environmental factors. Studies show a concentration in areas of higher economic development suggesting a relationship to diet, particularly excess animal fat and low fiber. Other factors that increase the risk of developing colon tumors are: age over 40, the presence of other diseases of the digestive tract, family history and ulcerative colitis.
Development of colon cancer at an early age, or at multiple sites, or recurrent colon cancer, suggests a genetically transmitted form of the disease as opposed to the sporadic form. There also is a slight increased risk for colon carcinoma in the individual who smokes.
The most common colon cancer cell type is adenocarcinoma which accounts for 95% of cases.
DIAGNOSIS
The development of polyps of the colon usually precedes the development of colon cancer by five or more years. The American Gastroenterologial Association revised its screening guidelines in 2003 to recommend that people with two or more first-degree relatives with colorectal cancer or a first-degree relative with colon or rectal cancer before age 60 should have a screening colonoscopy beginning at age 40 or beginning 10 years prior to the age of the earlier colon cancer diagnosis in their family (whichever is earliest). Those with a first-degree relative diagnosed with colon cancer after age 60 or two second-degree relative with colon or rectal cancer should begin screening at age 40 with one of the methods listed above, such as annual sigmoidoscopy. The most common colon cancer screening tests are colonoscopy, sigmoidoscopy, and fecal occult blood test.
CT scans and Barium enemas are also routinely used for diagnosis of colon and rectal cancers.
TREATMENT OF COLON CANCER
Almost all colon tumors are treated with surgery first, regardless of stage. The malignant tumor, adjacent tissues and any lymph nodes that may contain cancer cells are removed.
In colon cancer, chemotherapy after surgery is usually only given if the cancer has spread to the lymph nodes (Stage III). Radiation therapy may also be used to induce tumor regression. As with other cancer treatments, the incidence of side effects varies with patient health and the exact nature of the treatment.
PREVENTION
There is not an absolute method for preventing colon cancer. Still, there are steps an individual can take to dramatically lessen the risk or to identify the precursors of colon cancer so that it does not manifest itself. People who turn age 50, and all of those with a history of colon cancer in their families, should speak with their physicians about the most recent screening recommendations from physician and cancer organizations. They should watch for symptoms and attend all recommended screenings to increase the likelihood of catching colon cancer early. Exercise is believed to reduce the risk of colon cancer. Apparently, no association exists between frequency of bowel movement or laxative use and risk of colon cancer.
PROGNOSIS
Prognosis depends on the stage of the disease and the overall health of the patient. If diagnosed early, before the tumor has spread from the bowel, these treatments are very effective, with about 90% of patients alive five years after diagnosis. If the colon cancer does not come back (recur) within 5 years, it is considered cured. Prognosis is poor in patients with liver and lung metastases.
Colon Cancer Symptoms And Signs
The large intestine, also called colon, is located in the abdominal cavity where it takes the form of an inverted U. It follows the small intestine into the pit right iliac then back along the abdomen, it is experiencing in its upper part, then downhill into the left iliac fossa where it forms a loop S (sigmoid colon ).
It then continues with the rectum and then, 15 cm lower, with the anal canal and ending with the anus. Malignant tumors of intestine develop in 70 percent of cases in the rectum and sigmoid, from the mucosa (inner layer) or more often a polyp (benign tumor that has cancer).
Symptoms
We have to wait very long, often several months to see the first symptoms usually occurring by the presence of blood or mucus in black, and disorders of transit for more than three weeks, mainly characterized by alternating diarrhea and constipation. Without treatment, cancer of the colon can cause intestinal obstruction, more rarely perforation of the bowel wall. Later, chronic bleeding that occurs in the tumor causes anemia and unintended weight loss.
If we do not yet know the exact causes of colon cancer, it is believed that some severe inflammatory diseases of the bowel as well as foods rich in fat and low in fiber promote its appearance.
We also believe that five per cent of cancers rectocoliques certainly have a family, ie they are favored by inherited genes. We know for example that children, brothers and sisters of people who had colon cancer may also develop this disease. This risk is particularly high in families with a "familial polyposis."
The disorder is characterized by the presence in many colon polyps, benign tumors that almost always turn into cancer if not removed in time. The progress of genetic engineering we will soon find the gene responsible for the disease among children in these families, regularly monitor those who own and operate them if necessary, while avoiding investigations and unnecessary fears to those who do the not.
Prevention and Early Detection
If there is no really effective way to prevent colon cancer, it is strongly recommended eating foods rich in fiber and drink plenty of fluids. The systematic excision of polyps discovered during an endoscopy is in fact the main measure to prevent colon cancer.
It is also impossible to practice early detection, for example by using a self-examination. The only way to detect colon cancer is to consult a doctor without delay from onset of symptoms mentioned above, namely the presence of blood in the stool and disorders transit. It is therefore necessary to regularly observe the appearance of the stool. The presence of blood should never be attributed to hemorrhoids, at least among those who have more than forty years before fully to investigate the intestine by endoscopy (direct examination with a flexible instrument that we introduced by the rectum).
As for reviews that are to detect the invisible presence of blood in the stool in search of a chronic hemorrhage, they may be useful but are not sufficient because they do almost never detect tumors early, when it is still curable. Moreover, the presence of blood in the stool is not always a sign of colon cancer.
The only way to make a diagnosis with certainty is that allows endoscopy to examine directly, or the lower part of the large intestine (rectodoscopie) where develop almost all the tumors of the intestine or the entire large intestine ( colonscopy).
Both Dick Aronson & James S. Pendergraft are contributors for EditorialToday. The above articles have been edited for relevancy and timeliness. All write-ups, reviews, tips and guides published by EditorialToday.com and its partners or affiliates are for informational purposes only. They should not be used for any legal or any other type of advice. We do not endorse any author, contributor, writer or article posted by our team.
Dick Aronson has sinced written about articles on various topics from Types of Cancer, Acupuncture Chiropractor and Types of Cancer. Dick Aronson has been involved in the healthcare industry for 35 years. He has written numerous articles on the subject and runs a number of informative websites, viz:. Dick Aronson's top article generates over 8100 views. to your Favourites.
James S. Pendergraft has sinced written about articles on various topics from Health, Alternative Medicine and Bacterial Vaginosis. Dr. James S. Pendergraft opened the Orlando Women's Center in March 1996 to provide a full range of health care for women, including. James S. Pendergraft's top article generates over 12100 views. to your Favourites.
