ABL1 and chronic myelogenous leukemia, BCR-ABL1 positive: Five different TKIs (imatinib, dasatinib, nilotinib, bosutinib, ponatinib) are approved for CML patients, permitting to tailor therapy at diagnosis and dynamically adapt thereafter on the basis of disease phase, individual risk assessment, treatment endpoints, comorbidities, response levels, and, in case of treatment failure, presence of TKI-resistant mutations in the BCR-ABL1 KD [30–32].