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The Colon Parts Mostly Affected by Cancer

Adenocarcinomas of the rectum and colon consist of 95 percent of the entire cases involving colorectal cancer. In the digestive tract, the colon and rectal adenocarcinomas form in the cells found in the colon’s inner lining.

Adenocarcinomas of the rectum and colon often start as polyp (a growth tissue). An adenoma, a particular type of polyp, may grow into cancer. Typically, doctors perform a colonoscopy to remove polyps before they become cancerous.

Cancer often affects the colon and rectum, which is the colon’s last section measuring approximately 20 to 25 cm long. Since cancer usually affects these two parts, it’s often known as colorectal cancer. Anal cancer is rare, but if it occurs in men, it affects the outer part of the rectum. In women, it affects the inner part.

Colorectal cancer’s exact cause is not known, but at least eight genes involved are traced to animal fat. During the breakdown of fat, bacteria within the bowel creates carcinogens, which irritate the intestine’s lining. Polyps often emerge as a result of this irritation which may result in cancer.

Colon Cancer Types and Areas they Affect 

Initially, the primary cancer types occur on or inside the mucus membrane. Most colon cancers seem to develop into polyps. The risk of cancer depends on tumor size. Almost all types of colon cancer occur at the lower part of the descending colon.

  • Colorectal adenocarcinoma: It develops within the large intestine’s inner lining then spreads to the other layers.
  • Gastrointestinal stromal tumors(GISTs): The GISTs tumors develop in the lining of the interstitial cells. They affect the rectum and the small intestine.
  • Leiomyosarcomas: This refers to cancer that affects smooth muscles. The rectum and colon have three muscle types that are often affected by leiomyosarcoma, and these three layers coordinate to guide waste across the digestive tract.

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