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JoJo,
Xeloda is considered a "smat drug" and technically, it is a "pro-drug". The definition of a drug is a compound that has a meaurable physiological of psycological effect. Xeloda on it's own, has no effect until it is activated by certain enzymes in the cancer cells and is turned into 5FU. Theoretically, xeloda will only attack cancer cells because the only ones which contain the activating enzyme are cancer cells.
Take care,
Al
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