阿司匹林可以預防結腸息肉(colon polyps)嗎？

5年前，公公結腸鏡檢查出有結腸息肉,醫生把它割下來。最近結腸鏡檢查再一次發現4毫米結腸息肉.據說阿司匹林可以預防結腸息肉

http://www.medicinenet.com/colon_polyps/page8.htm#can_colon_polyps_be_prevented 

"The best support for a treatment to prevent polyps is with nonsteroidal anti-inflammatory drugs (NSAIDs), a class of drugs that includes aspirin, ibuprofen (Motrin, Advil), celecoxib (Celebrex), and many others. Aspirin has been shown in several studies to reduce the formation of polyps by 30% to 50%. The effect is likely to occur with higher doses of aspirin (more than the 81-325 mg that is recommended for cardiovascular disease prevention), and there is concern about aspirin's side effect of gastrointestinal bleeding at these doses."

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