Chapter 20. Colorectal
Risk factors associated with colorectal cancer include which one of the following?
A. Irritable bowel syndrome
B. Low intake of dietary fiber
C. Low intake of red meat
D. Chronic aspirin therapy
Inflammatory bowel disease is associated with an increased risk of colorectal cancer, but there is no association with irritable bowel syndrome. Other factors associated with increased risk are a low intake of dietary fiber and a high intake of red meat. Risk has been shown to be reduced by regular ingestion of aspirin.
Surgery for liver metastases from colorectal cancer is:
A. Associated with a 10% mortality
B. Contraindicated if more than 1 lesion is present
C. Associated with 16% to 40% 5-year survival
D. Usually followed with consolidation radiotherapy
Surgery for liver metastases from colorectal cancer is associated with a 2% mortality, can be performed if more than 1 lesion is present, and is associated with 16% to 40% 5-year survival. Radiotherapy is not used for liver metastases, as the toxicity to normal liver tissue would be too severe.
A. Is a monoclonal antibody that targets vascular endothelial growth factor (VEGF)
B. Is a monoclonal antibody that targets EGFR
C. Has no proven survival benefit in the metastatic setting
D. Is standard treatment for metastatic colorectal cancer in the UK
Bevacizumab is a monoclonal antibody that targets VEGF. It has been shown to improve survival in the metastatic setting when used in combination with chemotherapy.
True about ulcerative colitis with malignancy
A. It has a better prognosis
B. Is related to disease activity
C. Is related to duration of ulcerative colitis
D. Malignancy is more in anorectal ulcerative colitis
Carcinoma of the colon afflicts patients with ulcerative colitis 7 to 30 times more frequently than it does the general population.
The risk of colon cancer in ulcerative colitis is related to 2 factors:
(1) Duration of the colitis, and (2) extent of colonic involvement. The risk of colon cancer for patients who have had the disease less than 10 years is low, but this risk ...