Browsing by Author "Wong, Eric"

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    Inhibition of BTK and PI3Kδ impairs the development of human JMML stem and progenitor cells
    (Elsevier, 2022) Ramdas, Baskar; Yuen, Lisa Deng; Palam, Lakshmi Reddy; Patel, Roshini; Pasupuleti, Santhosh Kumar; Jideonwo, Victoria; Zhang, Ji; Maguire, Callista; Wong, Eric; Kanumuri, Rahul; Zhang, Chujing; Sandusky, George; Chan, Rebecca J.; Zhang, Chi; Stieglitz, Elliot; Haneline, Laura; Kapur, Reuben; Pediatrics, School of Medicine
    Juvenile myelomonocytic leukemia (JMML) is an aggressive myeloproliferative neoplasia that lacks effective targeted chemotherapies. Clinically, JMML manifests as monocytic leukocytosis, splenomegaly with consequential thrombocytopenia. Most commonly, patients have gain-of-function (GOF) oncogenic mutations in PTPN11 (SHP2), leading to Erk and Akt hyperactivation. Mechanism(s) involved in co-regulation of Erk and Akt in the context of GOF SHP2 are poorly understood. Here, we show that Bruton’s tyrosine kinase (BTK) is hyperphosphorylated in GOF Shp2-bearing cells and utilizes B cell adaptor for PI3K to cooperate with p110δ, the catalytic subunit of PI3K. Dual inhibition of BTK and p110δ reduces the activation of both Erk and Akt. In vivo, individual targeting of BTK or p110δ in a mouse model of human JMML equally reduces monocytosis and splenomegaly; however, the combined treatment results in a more robust inhibition and uniquely rescues anemia and thrombocytopenia. RNA-seq analysis of drug-treated mice showed a profound reduction in the expression of genes associated with leukemic cell migration and inflammation, leading to correction in the infiltration of leukemic cells in the lung, liver, and spleen. Remarkably, in a patient derived xenograft model of JMML, leukemia-initiating stem and progenitor cells were potently inhibited in response to the dual drug treatment.
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    Reduced intensity conditioning for acute myeloid leukemia using melphalan- vs busulfan-based regimens: a CIBMTR report
    (SAGE, 2020-07-14) Zhou, Zheng; Nath, Rajneesh; Cerny, Jan; Wang, Hai-Lin; Zhang, Mei-Jie; Abdel-Azim, Hisham; Agrawal, Vaibhav; Ahmed, Gulrayz; Al-Homsi, A. Samer; Aljurf, Mahmoud; Alkhateeb, Hassan B.; Assal, Amer; Bacher, Ulrike; Bajel, Ashish; Bashir, Qaiser; Battiwalla, Minocher; Bhatt, Vijaya Raj; Byrne, Michael; Cahn, Jean-Yves; Cairo, Mitchell; Choe, Hannah; Copelan, Edward; Cutler, Corey; Damlaj, Moussab B.; DeFilipp, Zachariah; De Lima, Marcos; Diaz, Miguel Angel; Farhadfar, Nosha; Foran, James; Freytes, César O.; Gerds, Aaron T.; Gergis, Usama; Grunwald, Michael R.; Gul, Zartash; Hamadani, Mehdi; Hashmi, Shahrukh; Hertzberg, Mark; Hildebrandt, Gerhard C.; Hossain, Nasheed; Inamoto, Yoshihiro; Isola, Luis; Jain, Tania; Kamble, Rammurti T.; Khan, Muhammad Waqas; Kharfan-Dabaja, Mohamed A.; Kebriaei, Partow; Kekre, Natasha; Khera, Nandita; Lazarus, Hillard M.; Liesveld, Jane L.; Litzow, Mark; Liu, Hongtao; Marks, David I.; Martino, Rodrigo; Mathews, Vikram; Mishra, Asmita; Murthy, Hemant S.; Nagler, Arnon; Nakamura, Ryotaro; Nathan, Sunita; Nishihori, Taiga; Olin, Rebecca; Olsson, Richard F.; Palmisiano, Neil; Patel, Sagar S.; Patnaik, Mrinal M.; Pawarode, Attaphol; Perales, Miguel-Angel; Politikos, Ioannis; Popat, Uday; Rizzieri, David; Sandmaier, Brenda M.; Savani, Bipin N.; Seo, Sachiko; Shah, Nirav N.; Uy, Geoffrey L.; Valcárcel, David; Verdonck, Leo F.; Waller, Edmund K.; Wang, Youjin; Weisdorf, Daniel; Wirk, Baldeep; Wong, Eric; Yared, Jean A.; Saber, Wael; Medicine, School of Medicine
    There is a lack of large comparative study on the outcomes of reduced intensity conditioning (RIC) in acute myeloid leukemia (AML) transplantation using fludarabine/busulfan (FB) and fludarabine/melphalan (FM) regimens. Adult AML patients from Center for International Blood and Marrow Transplant Research who received first RIC allo-transplant between 2001 and 2015 were studied. Patients were excluded if they received cord blood or identical twin transplant, total body irradiation in conditioning, or graft-versus-host disease (GVHD) prophylaxis with in vitro T-cell depletion. Primary outcome was overall survival (OS), secondary end points were leukemia-free survival (LFS), nonrelapse mortality (NRM), relapse, and GVHD. Multivariate survival model was used with adjustment for patient, leukemia, and transplant-related factors. A total of 622 patients received FM and 791 received FB RIC. Compared with FB, the FM group had fewer transplant in complete remission (CR), fewer matched sibling donors, and less usage of anti-thymocyte globulin or alemtuzumab. More patients in the FM group received marrow grafts and had transplantation before 2005. OS was significantly lower within the first 3 months posttransplant in the FM group (hazard ratio [HR] = 1.82, P < .001), but was marginally superior beyond 3 months (HR = 0.87, P = .05). LFS was better with FM compared with FB (HR = 0.89, P = .05). NRM was significantly increased in the FM group during the first 3 months of posttransplant (HR = 3.85, P < .001). Long-term relapse was lower with FM (HR = 0.65, P < .001). Analysis restricted to patients with CR showed comparable results. In conclusion, compared with FB, the FM RIC showed a marginally superior long-term OS and LFS and a lower relapse rate. A lower OS early posttransplant within 3 months was largely the result of a higher early NRM.