1.   A new study has failed to find evidence that vitamin supplements protect against the development of precancerous growths in the colon.

2.   The disease causes hundreds of precancerous growths called polyps to form in the intestine, leading almost invariably to colon cancer.

3.   The evidence of precancerous growths was most pronounced in subjects who smoked both marijuana and tobacco, or cocaine and tobacco.

4.   Two years ago, he underwent an operation to remove some precancerous growths on his colon.

5.   With that test, Leffall said, a physician can remove cancerous and precancerous growths as they are identified, with no need for separate surgery later.

6.   Government researchers found that the two most widely used screening tests for colon cancer together missed one-quarter of the tumors and precancerous growths detected by colonoscopy.

7.   This exam, called a colonoscopy, will find any evidence of cancer or of precancerous growths called polyps.