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The treatment with 2nd-generation tyrosine kinase inhibitors (2G-TKIs), namely, dasatinib and nilotinib, has been reported to have faster and deeper responses in newly diagnosed chronic phase-chronic myeloid leukemia (CP-CML) patients as compared with imatinab. A number of studies on the discontinuation of 2G-TKIs have been conducted and recently published. A meta-analysis was conducted in this study to assess the rate of treatment-free remission (TFR) rate as well as the long-term safety of 2G-TKI discontinuation in CML patients with stable deep molecular response (DMR). 517 patients were recruited in 5 single-armed, prospective cohort studies. The overall weighted mean TFR rate at the follow-up of 12 months reached 57% (95% CI 51-64%;  I 2 = 56.4 %). The weighted mean TFR rate at the 24-month follow-up was 53% (95% CI 47-60%;  I 2 = 47.1 %). The loss of TFR was primarily concentrated in the first 12 months. 96.5% of patients, having restarted TKI therapy after a molecular relapse, achieved major molecular response (MMR) rapidly. There were four deaths at the two-year follow-up. As suggested from the results of the final study, 2G-TKI discontinuation in CML patients with stable DMR was reported to be feasible. Relapsed patients were retreated with 2G-TKI, and over 95% of patients could reach MMR. Almost no deaths occurred due to adverse events in two years after discontinuation, and more than half of the patients could maintain a TFR.

computational and mathematical methods in medicine

Second-Generation Tyrosine Kinase Inhibitor Discontinuation in Chronic Myeloid Leukemia Patients with Stable Deep Molecular Response: A Systematic Review and a Meta-Analysis