Rectal cancer

Rectal cancer refers to cancer between the dentate line and the junction of the sigmoid colon and rectum. Is one of the most common malignancies in the gastrointestinal tract. The main manifestations are abdominal pain, abdominal discomfort, etc .; rectal cancer will have obvious lower abdominal pain in the advanced stage. As the disease progresses, the tumor grows to a certain degree, and the patient will develop systemic symptoms such as anemia and weight loss. Its morbidity ranks third in the world for malignant tumors. In 2011, the morbidity rate in China was about 23 / 100,000 and the mortality rate was about 11 / 100,000. However, early colorectal symptoms are not obvious, and most patients are already advanced when diagnosed. The 5-year survival rate of these patients is less than 10%. More than 90% of the cases are older than 40 years old. The incidence of colorectal cancer is close to that of men and women around the world, and men are slightly higher than women.