Updated on 2026/08/21

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写真a

 
Takuma Ohashi
 
Organization
Graduate School of Medicine Department of Medicine Hematology and Clinical Immunology Assistant Professor
School of Medicine Medical Course
Title
Assistant Professor
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Research Areas

  • Life Science / Hematology and medical oncology

Papers

  • Personalized multivariable clinical prognostic model for patients with acute myeloid leukemia receiving intensive chemotherapy.

    Kengo Katsuki, Takuya Miyazaki, Moka Komaki, Yusuke Saigusa, Takayoshi Tachibana, Takayuki Sakuma, Kodai Hasegawa, Natsuki Hirose, Masahiro Akimoto, Akihiko Izumi, Takuma Ohashi, Ayako Matsumura, Taisei Suzuki, Yoshimi Ishii, Yuki Nakajima, Maki Hagihara, Masatsugu Tanaka, Shin Fujisawa, Hideaki Nakajima

    International journal of hematology   2026.5

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    PURPOSE: This study aimed to develop and validate a personalized prognostic model for patients with newly diagnosed with acute myeloid leukemia (AML) receiving intensive cytarabine- and anthracycline-based chemotherapy. METHODS:  We retrospectively analyzed 161 patients treated at a single center and externally validated the model in 184 patients from two institutions. RESULTS: Using LASSO Cox regression, nine readily available clinical variables (age, sex, performance status, history of diabetes, respiratory disease, prior myelodysplastic syndrome or myeloproliferative neoplasm, serum albumin level, uric acid level, and adverse cytogenetic risk) were selected to construct a nomogram. The model demonstrated good discrimination of overall survival, with a concordance index of 0.721 and 0.678 in the training and validation cohorts, respectively. Calibration plots showed strong agreement between the predicted and observed outcomes. Based on the nomogram scores, the patients were stratified into three risk groups, with 3-year overall survival rates of 84.1%, 57.2%, and 11.9% in the good, intermediate, and poor-risk groups, respectively. To enhance clinical accessibility, an online tool was developed for use in real-world settings. CONCLUSION: This nomogram integrates disease- and patient-related factors and allows for individualized prognostic assessment. This may support clinical assessment through personalized risk evaluation in AML patients.

    DOI: 10.1007/s12185-026-04222-1

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  • Successful treatment of relapsed FLT3-mutated donor cell-derived MDS/AML with FLT3 inhibitor gilteritinib. International journal

    Mana Kawano, Hiroyoshi Kunimoto, Akihiko Izumi, Akiko Adachi, Ayaka Miura, Chiaki Yokoyama, Kodai Hasegawa, Mayoko Shirafuta, Marika Tanaka, Takayuki Sakuma, Takuma Ohashi, Hiroyuki Takahashi, Takuya Miyazaki, Takayoshi Tachibana, Maki Hagihara, Kenji Matsumoto, Hideaki Nakajima

    Annals of hematology   105 ( 4 )   2026.2

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    Donor cell-derived myelodysplastic syndrome/acute myeloid leukemia is a rare but serious complication of allogeneic hematopoietic stem cell transplantation, and its optimal treatment has not been established. Here, we report a case of a 44-year-old woman who was diagnosed with donor cell-derived myelodysplastic syndromes with excess blasts carrying RAD21 and KMT2D mutations after six-year clinical remission of her initial acute myeloid leukemia treated with bone marrow transplantation from an unrelated male donor. The disease subsequently transformed to acute myeloid leukemia harboring a newly acquired FLT3 internal tandem duplication mutation. Azacitidine and venetoclax with cytarabine were both ineffective, but gilteritinib monotherapy rapidly reduced blasts and achieved near complete remission. The patient then underwent haploidentical stem cell transplantation from her son, followed by gilteritinib maintenance therapy. She achieved complete remission with clearance of donor cell-derived mutations and has remained in remission for more than one year. To our knowledge, this is the first case report of a relapsed FLT3-mutated donor cell-derived acute myeloid leukemia who was successfully treated with a FLT3 inhibitor, gilteritinib, which highlights the potential effectiveness of gilteritinib not only as a salvage therapy but also as an effective bridging and maintenance therapy in relapsed FLT3-mutated donor cell-derived acute myeloid leukemia.

    DOI: 10.1007/s00277-026-06896-3

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  • Distinct features of trisomy 8-associated autoinflammatory disease from Behçet's disease: case series and systematic review. International journal

    Kento Ichikawa, Soichiro Adachi, Kaoru Takase-Minegishi, Yuta Nakayama, Yuma Nagasawa, Yuki Iizuka, Ayaka Maeda, Lisa Hirahara, Yutaro Soejima, Takuma Ohashi, Hiroyoshi Kunimoto, Nobuyuki Horita, Ryusuke Yoshimi, Yohei Kirino, Hideaki Nakajima

    Clinical and experimental rheumatology   43 ( 10 )   1718 - 1725   2025.10

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    OBJECTIVES: To characterise patients with trisomy 8 presenting with autoinflammatory features, comparing them to patients with Behçet's disease (BD). METHODS: We comprehensively reviewed studies on trisomy 8-associated autoinflammatory symptoms from four online databases and analysed clinical data from both published cases and our institution. We then compared the clinical features of these patients with those of 657 BD patients from the Yokohama City University Registry. RESULTS: Of 1,542 screened articles, 88 involving 181 patients were eligible, along with six additional patients from our institution, resulting in a total of 187 patients included. Fever was the most common symptom in patients with trisomy 8 (85.8%), followed by oral ulcers (80.8%), gastrointestinal lesions (76.1%), genital ulcers (54.7%), and skin lesions (53.7%). Compared to BD patients, trisomy 8 patients exhibited higher rates of fever and gastrointestinal involvement (p<0.001), but lower rates of oral and genital ulcers, uveitis, and skin involvement (p<0.001), with no significant difference in joint symptoms. Trisomy 8 patients were older and had lower haemoglobin levels, increased mean corpuscular volume, decreased platelet counts, and higher C-reactive protein levels than BD patients. Additionally, the mortality rate was significantly higher in trisomy 8-positive patients (odds ratio, 11.74; 95% confidence interval, 5.94-22.82). CONCLUSIONS: Trisomy 8-associated autoinflammatory disease patients were older and had poorer prognoses, more gastrointestinal involvement, and less frequent oral and genital ulcers and skin involvement, making BD diagnosis less likely. Bone marrow examination should be considered for late-onset BD-like disease patients, particularly with recurrent fever.

    DOI: 10.55563/clinexprheumatol/8j7rbr

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  • Delayed Methotrexate Elimination Following High-dose Methotrexate Prophylaxis in High-risk Diffuse Large B-cell Lymphoma.

    Masahiro Akimoto, Takuya Miyazaki, Hiroyuki Takahashi, Takaaki Takeda, Yuto Hibino, Mayumi Tokunaga, Takuma Ohashi, Ayako Matsumura, Haruka Teshigawara, Taisei Suzuki, Hiroshi Teranaka, Yuki Nakajima, Kenji Matsumoto, Chizuko Hashimoto, Katsumichi Fujimaki, Hiroyuki Fujita, Rika Sakai, Shin Fujisawa, Hideaki Nakajima

    Internal medicine (Tokyo, Japan)   64 ( 18 )   2716 - 2722   2025.9

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    Objective High-dose methotrexate (HD-MTX) is widely used as central nervous system (CNS) prophylaxis in patients with diffuse large B-cell lymphoma (DLBCL) who are at a high risk of CNS relapse. Ensuring safe prophylactic administration with minimal adverse events is a key concern; however, few studies have detailed the safety profile of HD-MTX prophylaxis in patients with high-risk DLBCL. We analyzed the adverse events associated with HD-MTX in this population, focusing on delayed MTX elimination. Methods This multicenter retrospective study included 98 patients with DLBCL at high risk of CNS relapse who received HD-MTX as part of frontline therapy between 2014 and 2020. CNS prophylaxis involved 2 cycles of HD-MTX (3.0 g/m2) at 2-week intervals. Results The median age at the diagnosis was 63 (34-84) years old, and 34 patients received a reduced methotrexate (MTX) dose. The overall incidence of delayed MTX elimination was 18.4%. No cases of delayed MTX elimination were observed in the group that received a 3-h MTX infusion (n=50). Toxicities were more frequent in patients with delayed MTX elimination than in those without (77.8% vs. 26.2%, p≤0.05), including higher incidences of grade ≥3 adverse events and grade ≤2 renal dysfunction. Conclusion Delayed MTX elimination is associated with increased complications. Shorter MTX infusion rates, particularly at 3 h, may reduce the risk of delayed MTX elimination.

    DOI: 10.2169/internalmedicine.4999-24

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  • PRC2-mediated apoptosis evasion is a therapeutic target of MDS/AML harboring inv(3)/t(3;3) and monosomy 7. International journal

    Hiroyoshi Kunimoto, Ayaka Miura, Maiko Sagisaka, Mieko Ito, Ryoichi Maenosono, Hirofumi Yamauchi, Kazuki Nishimura, Daisuke Honma, Shinji Tsutsumi, Akiko Adachi, Takayuki Sakuma, Takuma Ohashi, Hiroshi Teranaka, Junji Ikeda, Sei Samukawa, Takashi Toya, Yuka Harada, Noriko Doki, Sheng F Cai, Hiroaki Maki, Hiroaki Goto, Akihide Yoshimi, Hideaki Nakajima

    HemaSphere   9 ( 7 )   e70149   2025.7

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    Myelodysplastic syndromes (MDS) and acute myeloid leukemia (AML) harboring both inv(3)/t(3;3) and monosomy 7 (-7) are highly aggressive myeloid cancers of which molecular pathogenesis and therapeutic vulnerability remain elusive. High throughput drug screens, CUT&Tag/RNA sequence, and functional assays using human MDS/AML cells revealed that EZH2 inhibitors efficiently induce apoptosis preferentially in MDS/AML with inv(3)/t(3;3) and -7 through the activation of GADD45γ-p38-p53 axis. EVI1 activated in 3q-rearranged MDS/AML was responsible for GADD45γ silencing by direct binding to its consensus sequence within GADD45γ promoter and recruitment of PRC2 complex via interaction with EZH2, which can be therapeutically targeted by EZH2 inhibition. MDS/AML with inv(3)/t(3;3) and -7 showed preferential sensitivity to EZH2 inhibition in both mouse model and patient samples. Thus, MDS/AML cells with inv(3)/t(3;3) and -7 possess apoptosis evasion mechanism through EVI1-PRC2-mediated repression of GADD45γ-p38-p53 axis, which is a potential therapeutic vulnerability in MDS/AML patients with these high-risk cytogenetic lesions.

    DOI: 10.1002/hem3.70149

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  • Clinical significance of C-reactive protein/platelet ratio from diagnosis to allogeneic hematopoietic stem cell transplantation in acute myeloid leukemia. International journal

    Akihiko Izumi, Takayoshi Tachibana, Jun Nukui, Takuya Miyazaki, Natsuki Hirose, Takuma Ohashi, Marika Tanaka, Kengo Katsuki, Taisei Suzuki, Yuki Nakajima, Kenji Matsumoto, Shin Fujisawa, Masatsugu Tanaka, Hideaki Nakajima

    Annals of hematology   104 ( 7 )   3733 - 3743   2025.7

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    Previous studies have shown that C-reactive protein/platelet ratio (CPR) before allogeneic hematopoietic stem cell transplantation (HSCT) is a predictor of survival in patients with hematological malignancies. This multicenter retrospective study aimed to evaluate the clinical significance of CPR from diagnosis to HSCT in patients with acute myeloid leukemia (AML) who underwent HSCT. This cohort included patients with AML who underwent their first HSCT between 2016 and 2021. CPR was evaluated at three time points: at diagnosis, after initial therapy, and pre-HSCT. The cut-off value for CPR was set at 0.05 based on previous studies. In total, 196 patients with a median age of 50 years (range: 15-72). High CPR was associated with the myeloblast ratio in the bone marrow at three points and was associated with high transfusion volume and poor performance status at HSCT. Overall survival (OS) at 2 years according to CPR at diagnosis, after initial therapy, and pre-HSCT (low vs. high) was 67.9% vs. 65.6% (P = 0.477), 72.6% vs. 54.8% (P = 0.022), and 73.1% vs. 49.7% (P < 0.001), and non-relapse mortality (NRM) was 15.8% vs. 19.0% (P = 0.557), 13.8% vs. 21.5% (P = 0.201), and 13.0% vs. 27.6% (P = 0.006), respectively. No significant differences were observed in the relapse rates. In multivariate analysis, the high CPR group pre-HSCT was associated with poor OS (HR = 1.86, 95%CI:1.13-3.07, P = 0.015) and higher NRM (HR = 2.52, 95%CI:1.26-5.04, P = 0.009). Pre-HSCT CPR was associated with post-HSCT OS and NRM. CPR is considered a marker that reflects the disease status and patient condition, suggesting the significance of CPR monitoring.

    DOI: 10.1007/s00277-025-06470-3

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  • Successful treatment of low-risk myelodysplastic syndrome-related anemia in patients with chronic kidney disease with daprodustat: A report of two cases. International journal

    Hiroyoshi Kunimoto, Takayuki Sakuma, Takuma Ohashi, Mayoko Shirafuta, Hiroshi Teranaka, Hideaki Nakajima

    EJHaem   5 ( 6 )   1335 - 1339   2024.12

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    Anemia is a major clinical manifestation seen in myelodysplastic syndromes (MDS). Treatment options for anemia in low-risk MDS are limited. Especially, oral medication which is uniformly effective for anemia in low-risk MDS is required. Hypoxia-inducible factor (HIF) prolyl hydroxylase (HIF-PH) inhibitors, such as daprodustat, are oral tablets effective for renal anemia. Pharmacological restoration of HIF activity by HIF-PH inhibitors may be beneficial for MDS-related anemia as well. Yet, their efficacy and safety against low-risk MDS are unclear. Here, we report two cases of low-risk MDS complicated with chronic kidney disease whose anemia responded to daprodustat treatment.

    DOI: 10.1002/jha2.1057

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  • A case of Bloom syndrome manifesting with therapy-related myelodysplastic syndromes harboring a novel BLM gene variant.

    Takuma Ohashi, Hiroyoshi Kunimoto, Jun Nukui, Haruka Teshigawara, Satoshi Koyama, Takuya Miyazaki, Maki Hagihara, Kenji Matsumoto, Eriko Koshimizu, Naomi Tsuchida, Haruka Hamanoue, Satoko Miyatake, Akihiro Yachie, Naomichi Matsumoto, Hideaki Nakajima

    International journal of hematology   119 ( 5 )   603 - 607   2024.5

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    Bloom syndrome (BS) is an autosomal recessive genetic disorder caused by variants in the BLM gene. BS is characterized by distinct facial features, elongated limbs, and various dermatological complications including photosensitivity, poikiloderma, and telangiectatic erythema. The BLM gene encodes a RecQ helicase critical for genome maintenance, stability, and repair, and a deficiency in functional BLM protein leads to genomic instability and high predisposition to various types of cancers, particularly hematological and gastrointestinal malignancies. Here, we report a case of BS with a previously unreported variant in the BLM gene. The patient was a 34-year-old woman who presented with short stature, prominent facial features, and a history of malignancies, including lymphoma, breast cancer, and myelodysplastic syndromes (MDS). She was initially treated with azacitidine for MDS and showed transient improvement, but eventually died at age of 35 due to progression of MDS. Genetic screening revealed compound heterozygous variants in the BLM gene, with a recurrent variant previously reported in BS in one allele and a previously unreported variant in the other allele. Based on her characteristic clinical features and the presence of heterozygous variants in the BLM gene, she was diagnosed with BS harboring compound heterozygous BLM variants.

    DOI: 10.1007/s12185-024-03751-x

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  • Comparison of standardized prophylactic high-dose and intrathecal methotrexate for DLBCL with a high risk of CNS relapse.

    Masahiro Akimoto, Takuya Miyazaki, Hiroyuki Takahashi, Yusuke Saigusa, Takaaki Takeda, Yuto Hibino, Mayumi Tokunaga, Takuma Ohashi, Ayako Matsumura, Haruka Teshigawara, Taisei Suzuki, Hiroshi Teranaka, Yuki Nakajima, Kenji Matsumoto, Chizuko Hashimoto, Katsumichi Fujimaki, Hiroyuki Fujita, Rika Sakai, Shin Fujisawa, Hideaki Nakajima

    International journal of hematology   119 ( 2 )   164 - 172   2024.2

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    The efficacy of high-dose methotrexate (HD-MTX) for central nervous system (CNS) relapse prophylaxis in patients with high-risk diffuse large B-cell lymphoma (DLBCL) is controversial. We compared the prophylactic effects of HD-MTX and intrathecal methotrexate (IT-MTX) on CNS relapse in high-risk DLBCL, in a multicenter retrospective study. A total of 132 patients with DLBCL at high risk of CNS relapse who received frontline chemotherapy and IT-MTX from 2003 to 2013 (n = 34) or HD-MTX from 2014 to 2020 (n = 98) were included. After a median follow-up of 52 months (range: 9-174), 11 patients had isolated CNS relapse: six (6.1%) in the HD-MTX group and five (14.7%) in the IT-MTX group. The median time until CNS relapse was 38 months (range: 11-122), and the cumulative incidence of CNS relapse at 3 years was 3.9% in the HD-MTX group and 6.1% in the IT-MTX group (P = 0.93). Similar results were obtained after adjusting for background factors using propensity score-matched analysis (4.5% HD-MTX vs. 7.6% IT-MTX, P = 0.84). The CNS relapse rate in HD-MTX-treated patients was equivalent to that in IT-MTX patients, demonstrating that HD-MTX was not superior to IT-MTX in preventing CNS relapse.

    DOI: 10.1007/s12185-023-03700-0

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  • Impact of standard-dose dipeptidyl peptidase-4 inhibitors on the incidence of graft-versus-host disease after allogeneic hematopoietic cell transplantation. International journal

    Shun-Ichi Kimura, Hiroaki Shimizu, Takuya Miyazaki, Masatoshi Sakurai, Susumu Tanoue, Kensuke Kayamori, Chikako Ohwada, Kazuki Yoshimura, Hideki Nakasone, Takuma Ohashi, Katsuhiro Shono, Takayoshi Tachibana, Kaoru Hatano, Keigo Okada, Yuta Kimura, Sachiko Seo, Noriko Doki, Masatsugu Tanaka, Yoshihiro Hatta, Satoshi Takahashi, Yoshinobu Kanda

    Bone marrow transplantation   58 ( 4 )   452 - 455   2023.4

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  • Incidence and Risk of Hematological Adverse Events Associated With Immune Checkpoint Inhibitors: A Systematic Literature Review and Meta-Analysis. International journal

    Takuma Ohashi, Kaoru Takase-Minegishi, Ayaka Maeda, Naoki Hamada, Ryusuke Yoshimi, Yohei Kirino, Hiroshi Teranaka, Hiroyoshi Kunimoto, Maki Hagihara, Kenji Matsumoto, Ho Namkoong, Nobuyuki Horita, Hideaki Nakajima

    Journal of hematology   12 ( 2 )   66 - 74   2023.4

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    BACKGROUND: Immune checkpoint inhibitors (ICIs) have been a breakthrough in cancer therapy. ICI therapy is generally better tolerated than cytotoxic chemotherapy; however, hematological adverse events (AEs) have not been fully analyzed. Hence, we performed a meta-analysis to evaluate the incidence and risk of ICI-related hematological AEs. METHODS: A systematic literature search was performed using PubMed, EMBASE, Cochrane Library, and the Web of Science Core Collection. Phase III randomized controlled trials (RCTs) involving ICI combination regimens were selected. The experimental group received ICIs with systemic treatment, and the control group received only the same systemic treatment. Odds ratios (ORs) for anemia, neutropenia, and thrombocytopenia were calculated using a random-model meta-analysis. RESULTS: We identified 29 RCTs with 20,033 patients. The estimated incidence rates for anemia of all grades and grades III-V were 36.5% (95% confidence interval (CI) 30.23 - 42.75) and 4.1% (95% CI 3.85 - 4.42), respectively. The incidence of neutropenia (all grades 29.7%, grades III-V 5.3%) and thrombocytopenia (all grades 18.0%, grades III-V 1.6%) was also calculated. CONCLUSION: Treatment with ICIs seemed unlikely to increase the incidence of anemia, neutropenia, and thrombocytopenia in all grades. However, programmed cell death-1 receptor ligand inhibitors significantly increased the risk of grades III-V thrombocytopenia (OR 1.53; 95% CI 1.11 - 2.11). Further research is needed to examine the potential risk factors.

    DOI: 10.14740/jh1090

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  • Clinical impact of cigarette smoking on the outcomes of allogeneic hematopoietic stem cell transplantation: a multicenter retrospective study. International journal

    Takuma Ohashi, Jun Aoki, Taiki Ando, Yasufumi Ishiyama, Yoshimi Ishii, Kazuho Miyashita, Yuki Nakajima, Takayoshi Tachibana, Maki Hagihara, Kenji Matsumoto, Masatsugu Tanaka, Heiwa Kanamori, Shin Fujisawa, Hideaki Nakajima

    Bone marrow transplantation   57 ( 7 )   1124 - 1132   2022.7

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    Smoking is associated with a high risk for different diseases including respiratory tract infections in immunocompetent patients. However, data about the effects of cigarette smoking on the outcomes of allogeneic hematopoietic stem cell transplantation (allo-HSCT) are limited. Therefore, we retrospectively investigated 608 patients aged ≥20 years with hematological disorders who received their first allo-HSCT at our group of hospitals between 2000 and 2015, and evaluated the impact of cigarette smoking before allo-HSCT on clinical outcomes by dividing patients into two groups according to the Brinkman index (BI) (nonsmokers or light smokers [BI: 0-500] and heavy smokers [BI: ≥ 500]). Multivariate analyses showed that heavy smoking was associated with a high 5-year cumulative incidence of chronic graft-versus-host disease (cGVHD) (hazard ratio [HR]: 1.73, 95% confidence interval [CI]: 1.15-2.61, p < 0.01). The 5-year overall survival (HR: 1.16, 95% CI: 0.86-1.58, p = 0.33) and disease-free survival (HR: 1.12, 95% CI: 0.83-1.52, p = 0.45) were similar between the two groups. Hence, cigarette smoking is correlated with cGVHD, although prospective studies must be conducted to further verify this result.

    DOI: 10.1038/s41409-022-01678-7

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Awards

  • Plenary award

    2025.5   JSH International Symposium  

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  • JALSG Young Investigator ASH Travel Award

    2018.9   NPO-JALSG  

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