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Chronic, low-grade adverse events are common in patients with chronic myeloid leukemia who are treated with imatinib. These events may decrease patient quality of life and adherence, and may ultimately contribute to a suboptimal response. Alternative, second-generation tyrosine kinase inhibitors, such as dasatinib, are available with the potential to reduce adverse events, improve tolerability, and support long-term treatment goals. We present the final, primary analysis of DASPERSE/CA180-400 (NCT01660906), an open-label, multicenter, phase IV study designed to determine whether chronic, low-grade nonhematologic adverse events in imatinib-treated patients improve after switching to dasatinib, without affecting efficacy. Of the 121 chronic, grade 1/2, imatinib-related adverse events identified at baseline in 39 patients, 77% resolved or improved within 3 months after switching to dasatinib. Dasatinib maintained a consistent safety profile; headache (33%), pleural effusion (26%), fatigue (23%), and rash (23%) were the most common treatment-related adverse events after the switch. Patients either maintained (56%) or improved (44%) their molecular response on dasatinib. Patients who switched to dasatinib also experienced improved patient-reported symptom burden from baseline as assessed by the MD Anderson Symptom Inventory for chronic myeloid leukemia (on a 1-10 scale, mean change in disease-specific score was - 2.24 and core symptom severity score was - 1.06). Overall, the efficacy and quality of life/symptom burden improved in many patients, despite the onset of dasatinib-related adverse events in most patients. This suggests that imatinib-treated patients with chronic, low-grade adverse events could benefit from switching to treatment with dasatinib.

annals of hematology

Outcomes of switching to dasatinib after imatinib-related low-grade adverse events in patients with chronic myeloid leukemia in chronic phase: the DASPERSE study