Most cases of colorectal cancer occur in the most distal part of the large intestine (the rectum, sigmoid colon, and descending colon). Why do fewer instances of colon cancer tend to occur in the...

Most cases of colorectal cancer occur in the most distal part of
the large intestine (the rectum, sigmoid colon, and descending
colon). Why do fewer instances of colon cancer tend to occur
in the proximal part of the large intestine? Include the anatomy
and function of the colon components in your explanation.