<prompt> Imatinib is used in the treatment ofChronic myelomonocytic leukemiaMyelodysplastic syndromeAcute lymphoblastic leukemiaGastrointestinal stromal tumors  <response>: Imatinib is used in the treatment of certain types of leukemia and gastrointestinal stromal tumors GIST. This medication is also used to treat dermatofibrosarcoma protuberans, a type of skin tumor. Imatinib is a biologic drug, also known as targeted therapy. 