A Swiss study links the drug to fewer cases of the deadly cancer, at least in women. It is not known why men did not see the same benefit.
The study also found that other diabetes medications are associated with a higher risk of the disease.
These drugs, known as sulfonylureas, include Glimepiride and Glyburide. Experts say these drugs produce more insulin, and insulin can promote cancer growth. The concern with them is their long-term use.
The study appears in the American Journal of Gastroenterology.