Surgery

Surgical removal of the tumor ("resection") along with any affected surrounding tissue is the standard initial treatment for potentially curable colorectal cancers (cancers that have not spread beyond the colon or lymph nodes). Drug therapy, radiation, or both are often used for advanced cancers and are continuously being tested with surgery in different combinations and sequences.

Although choosing a qualified surgeon is critical, choosing a hospital experienced in procedures is also important. The more often colon cancer surgery is performed at a given hospital, the lower the mortality rate at that hospital is likely to be. In one 2000 study, the 30-day postoperative mortality rate for patients treated at hospitals in the top quartile of procedure volume was 3.5%. For hospitals in the bottom quartile, mortality was 5.5%. However, the differences were small, and significantly less than seen for more complex cancer surgeries.

Colectomy

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Unless cancer is very advanced, most tumors are removed by an operation known as colectomy:

• Colectomy involves removing the cancerous part of the colon and nearby lymph nodes.
• The surgeon then reconnects the intestine by a procedure known as anastomosis.
• If the surgeon cannot reconnect the intestine, usually because of infection or obstruction, a colostomy is performed. The need for colostomies is higher after surgery for rectal cancer. In most cases of colon cancer, colostomies are not needed.

Click the icon to see an illustrated series detailing colon cancer treatment.