Ataergin, S.Arpaci, F.Cetin, T.Guran, s.Yakicier, C.Beyzadeoglu, M.Ozet, A.2019-02-082019-02-0820060361-8609http://hdl.handle.net/11693/49157A 38‐year‐old female with chronic myeloid leukemia underwent an allogeneic bone marrow transplantation from her full‐matched brother. Eleven months later, she readmitted with an acute leukemia that was shown to be of donor origin. The patient never achieved a remission even after chemotherapies with cytarabine and mitoxantrone, donor lymphocyte infusion, and second allogeneic peripheral blood stem cell transplantation. Donor cell leukemia (DCL) is sometimes misdiagnosed as relapse by clinicians and the real incidence may be higher than expected. Cytogenetic and molecular techniques may be helpful to clarify the issue of the leukemia. The current case is another case of DCL reported in the literature after an allogeneic transplant for a kind of leukemia. Am. J. Hematol. 81:370–373, 2006EnglishLeukemiaCMLDonor cellBone marrow transplantationTBIArticle10.1002/ajh.206151096-8652