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Colon cancer staging is an estimate of the amount of penetration of a particular cancer. It is performed for diagnostic and research purposes, and to determine the best method of treatment. The systems for staging colorectal cancers depend on the extent of local invasion, the degree of lymph node involvement and whether there is distant metastasis.
Colon cancer is the third most common cancer and the second most common cause of cancer death in the USA. [8] Due to its prevalence, screening protocols have been created for prevention of disease. Screening colonoscopies with or without polypectomy have been shown to decrease cancer morbidity and mortality. [ 9 ]
Depending on the staging, size and location of the tumour, neoadjuvant radiotherapy often combined with chemotherapy may be used to shrink the tumour prior to surgery and prevent further spread. Adjuvant chemotherapy may also be used post-surgery to prevent further disease spread [ 12 ]
Since polyps often take 10 to 15 years to transform into cancer in someone at average risk of colorectal cancer, guidelines recommend 10 years after a normal screening colonoscopy before the next colonoscopy. (This interval does not apply to people at high risk of colorectal cancer or those who experience symptoms of the disease.) [28] [29]
A liver metastasis is a malignant tumor in the liver that has spread from another organ that is affected by cancer. The liver is a common site for metastatic disease because of its rich, dual blood supply (the liver receives blood via the hepatic artery and portal vein). Metastatic tumors in the liver are 20 times more common than primary liver ...
In males, researchers suggest that the overall reduction in cancer death rates is due in large part to a reduction in tobacco use over the last half century, estimating that the reduction in lung cancer caused by tobacco smoking accounts for about 40% of the overall reduction in cancer death rates in men and is responsible for preventing at least 146,000 lung cancer deaths in men during the ...
The treatment depends on the location of the tumor, as well as the type of cancer cell and whether it has invaded other tissues or spread elsewhere. These factors also determine the prognosis. Overall, the GI tract and the accessory organs of digestion (pancreas, liver, gall bladder) are responsible for more cancers and more deaths from cancer ...
Colectomy as treatment for colorectal cancer also includes lymphadenectomy, or removal of surrounding lymph nodes, which may be done for staging of the cancer or removal of cancerous nodes. [11] More extensive lymphadenectomy is sometimes accomplished by the removal of the mesocolon , the fatty tissue adjacent to the colon, which contains blood ...
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