n. any one of a class of *antimetabolite drugs used in the treatment of gastrointestinal malignancies and breast cancer. They include *fluorouracil and the orally administered drugs *capecitabine and tegafur.
n. a drug of the *fluoropyrimidine class that is used in treatment of advanced or metastatic colorectal cancer, stomach cancer, and breast cancer. Side-effects may include blood disorders (see myelosuppression) and mouth ulcers.... capecitabine
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