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Blood, 15 June 2007, Vol. 109, No. 12, pp. 5164-5167. Prepublished online as a Blood First Edition Paper on March 6, 2007; DOI 10.1182/blood-2007-01-069831.
CLINICAL TRIALS AND OBSERVATIONS Long-term disease-free survivors with cytogenetically normal acute myeloid leukemia and MLL partial tandem duplication: a Cancer and Leukemia Group B study1 Division of Hematology and Oncology, Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus; 2 The Cancer and Leukemia Group B (CALGB) Statistical Center, Duke University Medical Center, Durham, NC; 3 Division of Human Cancer Genetics, Department of Microbiology, Virology, Immunology, and Medical Genetics, Comprehensive Cancer Center, The Ohio State University, Columbus; 4 Charité, Campus Benjamin Franklin, Medizinische Klinik III, Berlin, Germany; 5 Section on Hematology and Oncology, Comprehensive Cancer Center of Wake Forest University, Winston-Salem, NC; 6 University of Alabama at Birmingham; 7 North Shore University Hospital, Manhasset, NY; 8 University of Chicago, IL The clinical impact of MLL partial tandem duplication (MLL-PTD) was evaluated in 238 adults aged 18 to 59 years with cytogenetically normal (CN) de novo acute myeloid leukemia (AML) who were treated intensively on similar Cancer and Leukemia Group B protocols 9621 and 19808. Twenty-four (10.1%) patients harbored an MLL-PTD. Of those, 92% achieved complete remission (CR) compared with 83% of patients without MLL-PTD (P = .39). Neither overall survival nor disease-free survival significantly differed between the 2 groups (P = .67 and P = .55, respectively). Thirteen MLL-PTD+ patients relapsed within 1.4 years of achieving CR. MLL-PTD+ patients who relapsed more often had other adverse CN-AMLassociated molecular markers. In contrast with previously reported studies, 9 (41%) MLL-PTD+ patients continue in long-term first remission (CR1; range, 2.5-7.7 years). Intensive consolidation therapy that included autologous peripheral stem-cell transplantation during CR1 may have contributed to the better outcome of this historically poor-prognosis group of CN-AML patients with MLL-PTD.
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