回复：回复：回复：at this age, first should rule out colon cancer,

first check stool, if any blood in the stool, any white blood cells.
In China, you can try to detect CEA (Carcinoembryonic Antigen) which can elevate in colon cancer, but also can elevate in other cancers too, so in USA, docotors don;t use it to screen colon cancer, they do directly colonoscopy instead

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• Thank you very much.回复：回复：回复：回复：at this age, first should rule o -qisilala- ♀ (60 bytes) () 12/23/2007 postreply 09:58:33