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A single arm phase II study to individualize dasatinib dosing based on trough levels and molecular response to maintain efficacy whilst minimising toxicity in elderly patients with chronic myelogenous leukaemia.
Australasian Leukaemia and Lymphoma Group (ALLG)
The primary purpose of this study is to evaluate the efficacy and safety of individualised dosing of dasatinib for elderly patients with chronic myelogenous leukaemia. Who is it for? You may be eligible to participate in this study if you are aged 60 years or over, and have been diagnosed with chronic myelogenous leukaemia in the chronic phase (CML-CP) in the previous three months. Study details All participants in this study will start taking dasatinib at 100mg per day. At day 7, a blood sample will be taken to measure the levels of dasatinib in the blood just prior to taking that day's dose. If the blood dasatinib level is above a certain point, then the daily dose will be decreased to 70mg per day. If the blood dasatinib level is adequately low, then the participant will continue taking 100mg per day. This process will be repeated on days 28 and 56, with further lower dose levels of 50mg per day and 50mg every other day available if blood dasatinib levels are above the specific concentration. The dose level may also be dropped at any time if signs of drug toxicity are present. Participants may also be escalated back up a dose level (up to a maximum of 100mg per day), if further blood tests every 3-6 months show that the drug has not sufficiently decreased markers of the leukaemia, i.e. treatment has not been adequately effective. Participants will continue taking the drug for the two year study period, followed by a further three years if it has proven to be safe and effective in these patients. It is hoped that the findings of this study will provide information on whether an individualised dose of dasatinib can be used in elderly CML-CP patients to minimise toxicity whilst maintaining the therapeutic effect to treat the disease