Background: With an annual incidence of 1-2 in a million, Ph*(+) chronic myeloid leukemia (CML) is a clonal hematopoietic stem cell disease that makes myeloid neoplastic cells breed out of control. This BCR-ABL (+) myeloproliferative disease makes up about 15-20% of all leukemia cases in adults. CML is seen more in males than females, with a rate of three to two. However, it does not show difference in prevalence in terms of age. CML consists of three clinical phases. The first one is the chronic phase, defined by rising white blood cell levels and also by myeloid proliferation and bone marrow maturation. While this phase does not exhibit complications, in diagnosis, it composes most of the patients. The second phase is the accelerated phase, which the disease progresses onto if it is not treated or does not respond to treatment. This time usually takes about three years. The third phase is the blastic phase. The chronic phase can still progress onto the next two phases within the first 2 years, with a rate of 10%. In the following years, the possibility increases by a 15-20% each year. Tyrosine kinase inhibitors (TKI) are the revolutionary drugs for the management of disease course in CML.
Methods: The aim of this review is to assess current approaches to CML patient’s follow-up and treatment with TKI. The CML and TKI literature search was made in PubMed, Web of Science, Scopus with particular focus on the randomized clinical trials, recommendations, guidelines and expert opinions.
Results: In managing CML, various treatment methods have been utilized for many decades. Prior to the development of tyrosine kinase inhibitors (TKI), interferon alpha was the primary tool, which was then complemented by allogeneic hematopoietic stem cell transplantation (HSCT). HSCT was actually successful in slowing the disease down in the long term and curing up to a 50% of the patients. Then the coming of imatinib era opened up different treatment perspectives. For the patients resistant or intolerant to the imatinib, second and third generation TKIs are successfully used in distinct CML disease states.
Conclusion: The survival benefits of TKI including imatinib, nilotinib, dasatinib, bosutinib, and ponatinib for the CML patients are outstanding. TKI-related adverse events could impact on the clinical course especially in long-term drug administrations. Current aim for the CML disease management in TKI era is to provide age- and sex-matched normal life duration to the CML patients.
Keywords: Chronic, myeloid, leukemia, tyrosine, kinase, inhibitors