Top of cancer in the intestinal mucosa. If left untreated, it can grow into the muscle layers beneath, and then through the intestinal wall. Most start a small increase in the bowel wall: colorectal polyp or adenoma. These fungi, like growths are usually benign, but some develop into cancer over time. Localized cancer is usually diagnosed during colonoscopy.
Invasive cancers, which are limited to the colon wall (TNM stages I and II), are often curable with surgery, for example, in England and Wales diagnosed with more than 90% of patients in this stage of the disease survive for 5 years. If left untreated, they spread to regional lymph nodes (Stage III). In England and Wales, approximately 48% of patients survive at this stage of the disease diagnosed more than five years , a cancer that is too distant sites (stage IV) metastatic usually not curable;. Approximately 7% of patients in England and Wales diagnosed survive in this place for more than five years.
Colorectal cancer is the third most common cancer in the world, but she is more prevalent in developed countries. More than half of people dying from colorectal cancer in the developed regions of the world to live. GLOBOCAN estimated that in 2008, 1.23 million new cancer cases diagnosed clinically, and that this type of cancer more than 600,000 people dead.