Novel Treatment Strategies for Chronic Myeloid Leukemia

Starting with imatinib, tyrosine kinase inhibitors (TKIs) have turned chronic myeloid leukemia (CML) from a lethal blood cancer into a chronic condition. As patients with access to advanced CML care have an almost normal life expectancy, there is a perception that CML is a problem of the past, and one should direct research resources elsewhere. However, a closer look at the current CML landscape reveals a more nuanced picture. Most patients still require life-long TKI therapy to avoid recurrence of active CML. Chronic TKI toxicity and the high costs of the well-tolerated agents remain challenging. Progression to blast phase still occurs, particularly in socioeconomically disadvantaged parts of the world, where high risk CML at diagnosis is common. Here we will review the prospects of further improving TKIs to achieve optimal suppression of BCR::ABL1 kinase activity, the potential of combining different classes of TKIs, and the current state of BCR::ABL1 degraders. We will cover combination therapy approaches to address TKI resistance in the setting of residual leukemia and in advanced CML. Despite the unprecedented success of TKIs in CML, more work is needed to truly finish the job, and we hope to stimulate innovative research aiming to achieve this goal.