Abstract
Philadelphia chromosome-positive acute lymphoblastic leukemia (Ph + ALL) is an aggressive leukemia that occurs in 20–40% of adult patients. Ph + ALL is caused by the Philadelphia chromosome (Ph), which consists of a t(9;22)(q34;q11) reciprocal translocation leading to the formation of a BCR-ABL1 fusion gene. The disease is treated with targeted therapy comprising ABL1 tyrosine kinase inhibitors (TKIs). Ponatinib is a third generation TKI that demonstrates higher binding affinity for ABL1 than first/second generation TKIs. Although intensive combined immunotherapy with ponatinib greatly improves the prognosis of Ph + ALL, the safety and efficacy profiles of ponatinib in Japanese patients are unclear. This retrospective study investigated five cases of Ph + ALL at a single institute to evaluate safety and efficacy profiles. Three patients achieved a deep molecular response (DMR) following combined intensive treatment with ponatinib as induction chemotherapy. Four patients received consolidative allogenic stem cell transplantation (allo-SCT) during their first complete response. Three of the four experienced early relapse within 100 days; they subsequently received ponatinib, and one of the three achieved a DMR. No patient experienced severe cardiovascular events. This case series suggests that ponatinib at a concentration of least 30 mg exhibits anti-leukemia effects in Japanese patients with Ph + ALL.
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Funding
This work was supported by research grants from the Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research (19K17860, to H.U.), the Okinaka Memorial Institute for Medical Research (to H.U.), and the Shinnihon Foundation of Advanced Medical Treatment Research (to H.U.).
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SK has received research grants from Chugai Pharmaceutical, Daiichi-Sankyo, Astellas, TAIHO PHARMA, Novartis, Takeda, Asahi Kasei Pharma, and Ohara Pharmaceutical, and a speaker honorarium from Bristol-Myers Squibb, Novartis, Pfizer, and Otsuka Pharmaceutical.
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The study was approved by the Ethics Committees of Saga University Hospital.
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Kidoguchi, K., Ureshino, H., Kizuka-Sano, H. et al. Efficacy and safety of ponatinib for patients with Philadelphia chromosome-positive acute lymphoblastic leukemia: a case series from a single institute. Int J Hematol 114, 199–204 (2021). https://doi.org/10.1007/s12185-021-03156-0
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DOI: https://doi.org/10.1007/s12185-021-03156-0