Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) PDGFRA-associated chronic eosinophilic leukemia ?
    ### Response:
    PDGFRA-associated chronic eosinophilic leukemia is a form of blood cell cancer characterized by an elevated number of cells called eosinophils in the blood. These cells help fight infections by certain parasites and are involved in the inflammation associated with allergic reactions.
    