Medical Definition of imatinib
: an anticancer drug taken orally in the form of its mesylate C29H31N7O·CH4O3S to treat chronic myelogenous leukemia and metastatic or unresectable gastrointestinal stromal tumors ◆Imatinib acts by inhibiting the abnormal tyrosine kinase produced by the Philadelphia chromosome. It is marketed under the trademark Gleevec.
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