How long do you continue treatment with imatinib in a patient with chronic eosinophilic leukemia who achieves remission?  

This has not been clearly established. If the patient has the FIP1L1/PDGFR rearrangement, these patients need very low doses for excellent response, typically 100 mg daily. If not, response rates are lower and they usually require higher doses. I would continue therapy indefinitely as TFR has not be...