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Maebashi-shi, Japan

Shimizu H.,Gunma University | Saitoh T.,Gunma University | Machida S.,Tokai University | Kako S.,Jichi Medical University | And 7 more authors.
European Journal of Haematology | Year: 2015

Adult patients with mixed phenotype acute leukemia (MPAL) have a poor prognosis, and the therapeutic role of allogeneic stem cell transplantation (allo-SCT) for MPAL remains to be elucidated. Thus, we retrospectively assessed the efficacy of allo-SCT for MPAL. Eighteen patients with MPAL were identified from the transplant outcome database of Kanto Study Group for Cell Therapy (KSGCT). We also selected 215 patients with acute myeloid leukemia (AML) and acute lymphoblastic leukemia (ALL) as control cohorts using an optimal matching method. The 5-yr overall survival (OS) rate of patients with MPAL was 48.1%, and patients in remission at the time of transplant showed significantly better survival than those not in remission (5-yr OS: 71.8% vs. 0%, P = 0.001). No significant differences were seen in OS when stratifying patients according to immunophenotype, cytogenetic abnormalities, or the type of induction therapy. The 5-yr OS rate of patients with MPAL was not significantly different compared with AML control patients (48.1% vs. 48.1%; P = 0.855) or ALL control patients (48.1% vs. 37.8%; P = 0.426). These results suggested that allo-SCT is an effective treatment for MPAL, especially early in the disease course, and innovative transplant approaches are warranted to improve the transplant outcome of patients with MPAL who are not in remission. © 2015 John Wiley & Sons A/S. Source


Hoshino T.,Leukemia Research Center
Kansenshōgaku zasshi. The Journal of the Japanese Association for Infectious Diseases | Year: 2012

Toxoplasmic encephalitis is a rare complication in patients with hematological malignancies. It is infrequently reported in patients undergoing allogeneic hematopoietic stem cell transplantation, much less in patients after conventional chemotherapy. A 75-year old female with acute myelogenous leukemia had an episode of aphasia, right homonymous hemianopsia, and consciousness disturbance 122 days after consolidation chemotherapy. Multiple enhancing space occupying lesions involving the left occipital lobe were seen on magnetic resonance imaging (MRI). HIV antibody was negative. Based on radiological findings, clinical presentation and positive Toxoplasma gondii serostatus, sulfadoxine and pyrimethamine were added. A rapid improvement was observed thereafter. Heightened awareness of the occurrence of toxoplasmic encephalitis, even in non-HIV patients, is needed for a better outcome. Source


Kihara R.,Nagoya University | Nagata Y.,University of Tokyo | Nagata Y.,Kyoto University | Kiyoi H.,Nagoya University | And 32 more authors.
Leukemia | Year: 2014

To clarify the cooperative roles of recurrently identified mutations and to establish a more precise risk classification system in acute myeloid leukemia (AML), we comprehensively analyzed mutations in 51 genes, as well as cytogenetics and 11 chimeric transcripts, in 197 adult patients with de novo AML who were registered in the Japan Adult Leukemia Study Group AML201 study. We identified a total of 505 mutations in 44 genes, while only five genes, FLT3, NPM1, CEBPA, DNMT3A and KIT, were mutated in more than 10% of the patients. Although several cooperative and exclusive mutation patterns were observed, the accumulated mutation number was higher in cytogenetically normal AML and lower in AML with RUNX1-RUNX1T1 and CBFB-MYH11, indicating a strong potential of these translocations for the initiation of AML. Furthermore, we evaluated the prognostic impacts of each sole mutation and the combinations of mutations and/or cytogenetics, and demonstrated that AML patients could be clearly stratified into five risk groups for overall survival by including the mutation status of DNMT3A, MLL-PTD and TP53 genes in the risk classification system of the European LeukemiaNet. These results indicate that the prognosis of AML could be stratified by the major mutation status in combination with cytogenetics. © 2014 Macmillan Publishers Limited. All rights reserved. Source


Ohtake S.,Kanazawa University | Miyawaki S.,Leukemia Research Center | Fujita H.,Yokohama City University | Kiyoi H.,Nagoya University | And 20 more authors.
Blood | Year: 2011

We conducted a multi-institutional randomized study to determine whether high-dose daunorubicin would be as effective as standard-dose idarubicin in remission-induction therapy for newly diagnosed adult patients younger than 65 years of age with acute myeloid leukemia. Of 1064 patients registered, 1057 were evaluable. They were randomly assigned to receive either daunorubicin (50 mg/m2 daily for 5 days) or idarubicin (12 mg/m2 daily for 3 days) in combination with 100 mg/m2 of cytarabine by continuous infusion daily for 7 days as induction therapy. Complete remission was achieved in 407 (77.5%) of 525 patients in the daunorubicin group and 416 (78.2%) of 532 in the idarubicin group (P = .79). Patients achieving complete remission received intensive postremission therapy that consisted of either 3 courses of high-dose cytarabine or 4 courses of standard-dose therapy. Overall survival rates at 5 years were 48% for the daunorubicin group and 48% for the idarubicin group (P = .54), and relapse-free survival rates at 5 years were 41% and 41% (P = .97), respectively. Thus, high-dose daunorubicin and standard-dose idarubicin were equally effective for the treatment of adult acute myeloid leukemia, achieving a high rate of complete remission and good long-term efficacy. This study is registered at http://www.umin.ac.jp/ctrj/as C000000157. © 2011 by The American Society of Hematology. Source


Miyawaki S.,Leukemia Research Center | Ohtake S.,Kanazawa University | Fujisawa S.,Yokohama City University | Kiyoi H.,Nagoya University | And 20 more authors.
Blood | Year: 2011

We conducted a prospective randomized study to assess the optimal postremission therapy for adult acute myeloid leukemia in patients younger than 65 years in the first complete remission. A total of 781 patients in complete remission were randomly assigned to receive consolidation chemotherapy of either 3 courses of high-dose cytarabine (HiDAC, 2 g/m2 twice daily for 5 days) alone or 4 courses of conventional standard-dose multiagent chemotherapy (CT) established in the previous JALSG AML97 study. Five-year disease-free survival was 43% for the HiDAC group and 39% for the multiagent CT group (P = .724), and 5-year overall survival was 58% and 56%, respectively (P = .954). Among the favorable cytogenetic risk group (n = 218), 5-year diseasefree survival was 57% for HiDAC and 39% for multiagent CT (P = .050), and 5-year overall survival was 75% and 66%, respectively (P = .174). In the HiDAC group, the nadir of leukocyte counts was lower, and the duration of leukocyte less than 1.0 × 109/L longer, and the frequency of documented infections higher. The present study demonstrated that the multiagent CT regimen is as effective as our HiDAC regimen for consolidation. Our HiDAC regimen resulted in a beneficial effect on disease-free survival only in the favorable cytogenetic leukemia group. This trial was registered at www.umin.ac.jp/ctr/ as #C000000157. © 2011 by The American Society of Hematology. Source

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