In regards to the etiology of colorectal cancer, the cause is unknown. Research indicates that diet, age, genetics and environment play a causative role. Predisposing factors such as bowel disorders may play a role as well. Bowel disorders that may be predisposing factors could include: ulcerative colitis, Crohn’s disease, polyposis, and inflammatory bowel disorder. There are several screenings that may help detect colorectal cancer. These screening tests may include an annual fecal blood test for those over the age of fifty, a colonoscopy every ten years, and a proctosigmoidoscopy every five years.
Symptoms for colorectal cancer can vary according to the tumor type, size, location and individual. Depending on what side the lesions are present, different symptoms will appear. Symptoms may involve change in bowl habits, blood in stool, abdominal pain, anorexia, and indigestion. The staging is based on the degree of depth of tumor involvement and presence of nodes. The staging system came from the Duke’s classification system but is still TNM. Colorectal metastasis can spread by direction extension into the layers of the bowel. The most common sites for the cancer to spread are the liver, lung, brain and... [continues]
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