Imatinib is indicated for the treatment of adult and pediatric chronic myeloid leukemia with Philadelphia chromosome mutation (Ph+) in blast crisis, accelerated phase, or chronic phase after IFN-alpha therapy failure. Additionally, imatinib is also indicated to treat adult and pediatric Ph+ acute lymphoblastic leukemia, adult myelodysplastic/myeloproliferative diseases, adult aggressive systemic mastocytosis, adult hypereosinophilic syndrome and/or chronic eosinophilic leukemia (CEL), adult dermatofibrosarcoma protuberans, and malignant gastrointestinal stromal tumors (GIST).