Jian Wang

China National Petroleum Corporation, Peping, Beijing, China

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Publications (86)346.99 Total impact

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    ABSTRACT: Non-metallocene catalysts containing [N, Si, N, P]-type ligands based on diphenyl phosphorus-phenylamine and their derivatives were synthesized and characterized by H(13C) NMR, ESI–MS and micro analysis. They were able to catalyze copolymerization of ethylene with N-acetyl-O-(hex-5-enyl)-l-tyrosine ethyl ester after activated by methylaluminoxane (MAO). Effects of transition metal atoms (Ti, Zr and Hf), ligand structures and polymerization conditions were investigated. The structures and properties of the obtained polymers were characterized by FT-IR, 13C NMR, GPC and DSC. The results indicated that the obtained copolymers had high weight average molecular weight of 2.70 × 105 g/mol and high comonomer incorporation rate of 23.07 wt% within the copolymer chain. The melting temperature of the copolymer was up to 138.6 °C higher than that of the polyethylene. Graphical Abstract
    No preview · Article · Jan 2016 · Catalysis Letters

  • No preview · Article · Dec 2015 · PLoS ONE
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    ABSTRACT: ZnO-Au25 nanocomposites were synthesized by doping Au25 nanoclusters into the porous ZnO nanospheres. It was notable that the ultrasmall Au25 nanoclusters possessed uniform sizes and fine dispersibility on the porous ZnO supports. A considerable correlation between the loading of Au25 nanoclusters and the photocatalytic activity was found. Compared with the pure ZnO nanospheres, the ZnO-Au25 nanocomposites exhibited more efficient photocatalytic activity in terms of degradation of Rhodamine B (RhB) in an aqueous solution. In addition, the possible photocatalytic mechanisms are discussed in this work. This strategy may be helpful for preparing other novel hybrid nanocomposites with well-defined structures and superior performances. © 2015 Science China Press and Springer-Verlag Berlin Heidelberg
    No preview · Article · Dec 2015 · Science China-Chemistry
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    ABSTRACT: CIAPIN1 (cytokine-induced apoptosis inhibitor 1) was recently identified as an essential downstream effector of the Ras signaling pathway. However, its potential role in regulating myeloid leukemia cells sensitivity to Imatinib remains unclear. In this study, we found depletion of CIAPIN1 inhibited proliferation and triggered more apoptosis of K562CML (chronic myeloid leukemia) cells with or without Imatinib treatment. Meanwhile, CIAPIN1 depletion decreased ERK5 phosphorylation and NF-κB activity. Importantly, treating CIAPIN1-depleted K562 cells with ERK5 signaling pathway specific inhibitor, XMD8-92, further inhibited proliferation and promoted apoptosis with or without Imatinib treatment. Treatment with the NF-κB specific inhibitor, Bay11-7082, induced nearly the same inhibition of proliferation and promotion of apoptosis conferred by CIAPIN1 depletion as was observed with XMD8-92 treatment. Further, XMD8-92 and Bay11-7082 synergistically inhibited proliferation and promoted apoptosis of CIAPIN1-depleted K562 cells with or without Imatinib treatment. The nude mice transplantation model was also performed to confirm the enhanced sensitivity of CIAPIN1-depleted K562 cells to Imaitinib. Thus, our results provided a potential management by which CIAPIN1 knock-down might have a crucial impact on enhancing sensitivity of K562 cells to Imatinib in the therapeutic approaches, indicating that CIAPIN1 knock-down might serve as a combination with chemotherapeutical agents in leukemia diseases therapy.
    No preview · Article · Dec 2015 · Biochemical pharmacology
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    Preview · Article · Nov 2015
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    ABSTRACT: A series of titanium and zirconium complexes with ligands based on di-isopropyl phosphorus-phenylamine and their derivatives were synthesized and characterized. These catalysts were utilized to catalyze the copolymerization of ethylene with N-acetyl-O-(dec-9-enyl)-L-tyrosine ethyl ester with high catalytic activity of 6.63 × 104 g P (mol Ti)−1 h−1 after activation by methylaluminoxane (MAO). The effects of ligand structure, metal atoms (Ti, Zr) and polymerization conditions were investigated in detail. The obtained polymers were characterized by 13C-NMR, DSC, FT-IR, and GPC.The results showed that the obtained copolymer had a high comonomer incorporation rate of 2.56 mol % within the copolymer chain. The melting temperature of the copolymer was up to 138.9 °C, higher than that of the obtained homopolyethylene.
    Preview · Article · Oct 2015 · Catalysts
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    ABSTRACT: Objectives: A recently published network meta-analysis showed that ligation combined with sclerotherapy might be the most efficacious intervention for secondary prophylaxis of variceal bleeding. Most studies excluded patients with concomitant gastric varices; thus, the outcomes in such patients have not yet been reported. The present study aimed to investigate the efficacy of two endoscopic procedures for secondary prophylaxis in cirrhotic patients presenting with both esophageal and gastric varices. Materials and methods: A randomized controlled study was carried out in a tertiary care referral center. Patients were randomized into two groups: sclerotherapy- and sclerotherapy+ group. Continued endoscopic ligation was used to treat esophageal varices in the sclerotherapy- group, whereas combined ligation and sclerotherapy with lauromacrogol was performed in the sclerotherapy+ group. A cyanoacrylate injection was used for gastric varices in both groups. All participants were followed up for 6 months. Results: Overall, 96 patients were included between 25 March 2012 and 25 June 2013. Three patients were lost during follow-up (one in the sclerotherapy- group and two in the sclerotherapy+ group). The cumulative recurrence rate of bleeding was significantly higher in the sclerotherapy+ group (14.6 vs. 35.4%, P=0.013). The cumulative mortality rate (2.1 vs. 6.3%, P=0.286) and the incidence rate of adverse events were similar between the two groups. Conclusion: Continued ligation+cyanoacrylate injection was superior to combined ligation and sclerotherapy+cyanoacrylate injection during the first 6 months in terms of rebleeding in cirrhotic patients presenting with both esophageal and gastric varices. Long-term results entail further investigation (http://www.clinicaltrials.gov, NCT01592578).
    No preview · Article · Oct 2015 · European journal of gastroenterology & hepatology
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    ABSTRACT: The neurodevelopmental transcription factor POU3F2 (also called OCT7 / BRN2) is expressed during neurogenesis. Moreover, POU3F2 expression has been reported as a promoter of proliferation and invasion in malignant melanoma of the skin. Since both melanomas and CNS-malignancies arise in organs of neuro-ectodermal origin, we investigated whether human gliomas expressed POU3F2 and the role of POU3F2 in glioma tumorigenesis. We performed immunohistochemistry of 149 grade II-IV gliomas from our tumor bank, and subsequently performed western blots and qPCR of 12 samples from each grade. In addition, we performed flow cytometric analysis of POU3F2 expression in 5 acutely dissociated tumors. Using lentiviral transfection we established glioma cell lines with POU3F2 overexpression or knock down in order the to investigate the effect of POU3F2 on proliferation, migration and differentiation, both in vitro and in vivo. The mechanism, by which POU3F2 regulates glioma progression, was also investigated. Immunohistochemistry showed that POU3F2 was almost uniformly expressed in human gliomas. Both western blot, qPCR and flow cytometry confirmed expression of POU3F2 in human gliomas. In acutely dissociated tumors, the POU3F2 positive cells displayed an increased cell percentage in the S and G2/M phase of the cell cycle. Moreover, POU3F2 overexpression in the glioma cell lines increased growth rates and colony formation. Overexpression of POU3F2 increased the levels of phosphorylated p-44/42 indicating activation of the ERK1/2 signaling pathway. Increased levels of downstream transcriptional targets c-Myc, Elk1 and Stat3 transcription factors in the POU3F2 overexpressing cell lines confirmed activation of the MAPK signaling pathway. Furthermore, the POU3F2 overexpressing cell lines displayed increased expression of the growth factor FGF2. U0126, an inhibitor of MEK1/2, decreased the cell proliferation and decrease levels of phospho-p44/42, phospho-stat3 and FGF2. Moreover, overexpression of the POU3F2 increases the level of other neurodevelopmental transcription factors associated with a pluripotent state. Ongoing studies aim at further elucidating the multiple roles of POU3F2 in brain tumor progression.
    No preview · Article · Aug 2015 · Cancer Research

  • No preview · Article · Aug 2015 · Cancer Research
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    ABSTRACT: Glioblastomas (GBMs) are aggressive brain tumors that always recur after radiotherapy. Cystine, mainly provided by the system Xc(-) antiporter, is a requirement for glioma cell synthesis of glutathione (GSH) which has a critical role in scavenging free radicals, for example, after radiotherapy. Thus, we hypothesized that the Xc(-)-inhibitor sulfasalazine (SAS) could potentiate the efficacy of radiotherapy against gliomas. Here, we show that the catalytic subunit of system Xc(-), xCT, was uniformly expressed in a panel of 30 human GBM biopsies. SAS treatment significantly reduced cystine uptake and GSH levels, whereas it significantly increased the levels of reactive oxygen species (ROS) in glioma cells in vitro. Furthermore, SAS and radiation synergistically increased DNA double-strand breaks and increased glioma cell death, whereas adding the antioxidant N-acetyl-L-cysteine (NAC) reversed cell death. Moreover, SAS and gamma knife radiosurgery (GKRS) synergistically prolonged survival in nude rats harboring human GBM xenografts, compared with controls or either treatment alone. In conclusion, SAS effectively blocks cystine uptake in glioma cells in vitro, leading to GSH depletion and increased ROS levels, DNA damage and cell death. Moreover, it potentiates the anti-tumor efficacy of GKRS in rats with human GBM xenografts, providing a survival benefit. Thus, SAS may have a role as a radiosensitizer to enhance the efficacy of current radiotherapies for glioma patients.Oncogene advance online publication, 23 March 2015; doi:10.1038/onc.2015.60.
    No preview · Article · Mar 2015 · Oncogene
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    ABSTRACT: CIAPIN1 (cytokine-induced antiapoptotic inhibitor 1) was recently identified as an essential downstream effector of the Ras signaling pathway and has been confirmed to be closely associated with various malignant tumors. However, its potential role in regulating breast cancer metastasis remains unclear. MMPs (matrix metalloproteinases) are a broad family of zinc-biding endopeptidases that participate in the ECM (extracellular matrix) degradation that accompanies cancer cell invasion, metastasis and angiogenesis. In this study, we found up-regulation of CIAPIN1 by lentiviral expression vector inhibited the migration, invasion and MMPs expression of MDA-MB-231 cells. Further, CIAPIN1 over-expression decreased NHE1 (Na(+)/H(+) exchanger 1) expression and ERK1/2 phosphorylation. Importantly, treating CIAPIN1 over-expressed MDA-MB-231 cells with the NHE1 specific inhibitor, Cariporide, further inhibited the metastatic capacity, MMPs expression and phosphorylated ERK1/2. Treatment with the MEK1 specific inhibitor, PD98059, induced nearly the same suppression of CIAPIN1 over-expression-dependent migration, invasion and MMPs expression as was observed with Cariporide. Further, Cariporide and PD98059 synergistically suppressed migration, invasion and MMPs expression of CIAPIN1 over-expressed MDA-MB-231 cells. Thus, our results revealed the mechanism by which CIAPIN1 targeted NHE1 to mediate migration and invasion of MDA-MB-231 cells through regulation of MMPs via ERK1/2 signaling pathway. Copyright © 2015. Published by Elsevier Inc.
    Full-text · Article · Feb 2015 · Experimental Cell Research
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    ABSTRACT: A key strategy for the study of the tumor microenvironment is to implant human tumor cells in an immunodeficient rodent strain ubiquitously expressing a fluorescent marker. Here, a novel nude rat expressing a green fluorescent protein (GFP) transgene was established and engrafted with primary human tumor tissue in order to separate tumor from stromal cell populations for subsequent molecular analysis. SD-TG (GFP) 2BalRrrc transgenic rats were crossed with HsdHan™: rnu/rnu Rowett nude rats to develop a GFP expressing immunocompromised rat. PCR and flow cytometry were used to follow the GFP genotype and phenotype in newborns. After three to four generations, animals were implanted with 4 T1 dsRed murine breast cancer cells or primary human glioblastoma (GBM) biopsies to generate xenografts for subsequent separation by fluorescence-activated cell sorting (FACS). Fluorecence microscopy and reverse transcription-PCR demonstrated that GFP, under the control of the human ubiquitin C promoter, was stably maintained and expressed in diverse organs over several generations. Immunophenotyping of blood samples by flow cytometry confirmed that the immunodeficient features of the parental rat strain, HsdHan™: rnu/rnu, were retained in the GFP nude rat. Both the murine cell line and human GBM biopsies engrafted, and stromal cell populations were isolated from dissociated xenografts by FACS to > 95% purity. A GFP transgene was stably introduced into a nude rat background in which human and murine cancer cells successfully engrafted. This animal strain provides a novel in vivo system for detailed cellular and molecular characterization of tumor-stroma interactions.
    Full-text · Article · Dec 2014 · Cancer Cell International
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    ABSTRACT: To explore the clinical characteristics, diagnosis and treatment regimens for retroperitoneal schwannoma. Clinicopathological data of 53 retroperitoneal schwannoma patients treated from January 1999 to April 2013 in our hospital were collected and analyzed using SPSS 13.0 statistical software. Symptoms of the retroperitoneal schwannoma were vague and nonspecific. 12 patients had interrupted abdominal pain, 9 patients had abdominal discomfort, and only 6 patients presented with abdominal mass while 24 patients were detected by health checkup. There were some characteristics but not specific findings in imaging examination such as CT, ultrasonography and MRI, so preoperative diagnosis rate was low with only 9 patients diagnosed as retroperitoneal schwannoma and 21 patients diagnosed as neurogenic tumor. S-100 immunohistochemisty was very important in pathological diagnosis, and the patients with benign retroperitoneal schwannoma got 100% tumor specific 5-year survival after complete excision while the 5-year survival of malignant retroperitoneal schwannoma was only 50.0%. Retroperitoneal schwannoma is a rare disease. Most of them are benign tumors, and complete surgical excision is the effective treatment.
    No preview · Article · Nov 2014 · Zhonghua zhong liu za zhi [Chinese journal of oncology]
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    ABSTRACT: Rheumatoid arthritis (RA) is a systemic autoimmune disease and collagen‑induced arthritis (CIA) is an animal model for RA. Micheliolide (MCL) is a novel compound with strong anti‑inflammatory effects. The present study was conducted to evaluate the therapeutic effects of MCL on RA. Mice were randomly divided into four groups and the CIA model mice were treated with methotrexate (MTX), MCL and dimethyl sulfoxide. A score associated with the severity of arthritis was assigned on alternate days from the 22nd day for 60 days. Histopathological changes and the serum levels of cytokines were measured on day 85. The results demonstrated that the MCL treatment group had arthritis scores lower than the CIA group and higher than the MTX group; compared with the CIA group, MCL and MTX significantly reduced the swelling of the paws and suppressed the degeneration of articular cartilage. Expression levels of macrophage colony‑stimulating factor (M‑CSF), tissue inhibitors of metalloproteinases‑1 (TIMP‑1) and complement component 5a (C5/C5a) were lower in the mice with arthritis compared with normal mice, however, following treatment with MCL and MTX, all the mice exhibited significant recovery to differing degrees. Unlike the MTX group, the MCL group failed to recover the level of soluble intercellular adhesion molecule‑1. In addition, the cytokine of B‑lymphocyte chemoattractant (BLC) solely presented in the MCL group. These results suggest that MCL may be considered for use as a novel therapeutic treatment against RA and that changes in the expression of cytokines C5/C5a, TIMP‑1, M‑CSF and BLC may underlie the mechanism by which MCL effects changes in this disease.
    Full-text · Article · Oct 2014 · Molecular Medicine Reports
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    ABSTRACT: Background Although several approaches for identification and isolation of carcinoma cells with tumour initiating properties have been established, enrichment of a population of pure and viable tumour-initiating cells (TICs) is still problematic. This study investigated possibilities to isolate a population of cancer cells with tumour initiating properties based on their adherence properties, rather than expression of defined markers or clonogenicity. Methods Several human cell lines derived from oral dysplasia and oral squamous cell carcinoma (OSCC), as well as primary cells derived from patients with OSCC were allowed to adhere to collagen IV-coated dishes sequentially. Rapid adherent cells (RAC), middle adherent cells (MAC) and late adherent cells (LAC) were then harvested and further investigated for their morphology, stem cell-like properties and molecular profile while grown in vitro and tongue xenotransplantation in NOD-SCID mice at serial dilutions. Results RAC showed significantly higher colony forming efficiency (p < 0.05), sphere forming ability, greater migration ability (p < 0.05), exhibited longer G2 phase and displayed higher expression of integrin β1 and other stem-cell related molecules as compared to MAC and LAC. RAC induced tongue tumours in NOD-SCID mice with the highest incidence. These tumours were also bigger and metastasised more frequently in loco-regional lymph nodes than MAC and LAC. Conclusions These findings prove for the first time that OSCC cells with tumour initiating properties can be enriched based on their rapid adhesiveness to collagen IV. This separation procedure provides a potentially useful tool for isolating TICs in OSCC for further studies on understanding their characteristics and drug-resistant behaviour.
    Full-text · Article · Oct 2014 · European Journal of Cancer
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    ABSTRACT: Background Although several studies suggest that stromal fibroblasts mediate treatment resistance in several cancer types, little is known about how tumor-associated astrocytes modulate the treatment response in brain tumors. Since traditionally used metabolic assays do not distinguish metabolic activity between stromal and tumor cells as well as 2-dimensional co-culture system does not recreate the formidable complexity of the microenvironment within 3-dimensional structures such as solid tumor tissue, we instead established a glioblastoma (GBM) cell-specific bioluminescent assay for direct measurements of tumor cell viability in the treatment of clinical relevant drugs.Methods Using lentiviral transfection, we established a panel of human GBM cell lines constitutively expressing a fusion transgene encoding luciferase and the enhanced green fluorescence protein (eGFP). We then initiated co-cultures with immortalized astrocytes, TNC-1, and the eGFP/Luc GBM cell lines. We then treated all eGFP/Luc GBM cell lines with Temozolomide (TMZ) and Doxorubicin, comparing co-cultures of glioblastoma (GBM) cells and TNC-1 astrocytes with mono-cultures of eGFP/Luc GBM cells. Cell viability was quantitated by measuring the luciferase expression.ResultsTitration experiments demonstrated that luciferase expression was proportional to the number of eGFP/Luc GBM cells, whereas it was not influenced by the number of TNC-1 cells present. Notably, the presence of TNC-1 astrocytes mediated significantly higher cell survival after TMZ treatment in the U251, C6, A172 cell lines as well as the in vivo propagated primary GBM tumor cell line (P3). Moreover, TNC-1 astrocytes mediated significantly higher survival after Doxorubicin treatment in the U251, and LN18 glioma cell lines.Conclusion Glioma cell-specific bioluminescent assay is a reliable tool for assessment of cell viability in the brain tumor cell compartment following drug treatment. Moreover, we have applied this assay to demonstrate that astrocytes can modulate chemo sensitivity of GBM tumor cells. These effects varied both with the cell line and cytotoxic drug that were used, suggesting that several mechanisms may be involved.
    Full-text · Article · Oct 2014 · Journal of Translational Medicine

  • No preview · Article · Oct 2014 · Cancer Research
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    ABSTRACT: There are currently no established radiological parameters that predict response to immunotherapy. We hypothesised that multiparametric, longitudinal magnetic resonance imaging (MRI) of physiological parameters and pharmacokinetic models might detect early biological responses to immunotherapy for glioblastoma targeting NG2/CSPG4 with mAb9.2.27 combined with natural killer (NK) cells. Contrast enhanced conventional T1-weighted MRI at 7±1 and 17±2 days post-treatment failed to detect differences in tumour size between the treatment groups, whereas, follow-up scans at 3 months demonstrated diminished signal intensity and tumour volume in the surviving NK+mAb9.2.27 treated animals. Notably, interstitial volume fraction (ve), was significantly increased in the NK+mAb9.2.27 combination therapy group compared mAb9.2.27 and NK cell monotherapy groups (p = 0.002 and p = 0.017 respectively) in cohort 1 animals treated with 1 million NK cells. ve was reproducibly increased in the combination NK+mAb9.2.27 compared to NK cell monotherapy in cohort 2 treated with increased dose of 2 million NK cells (p<0.0001), indicating greater cell death induced by NK+mAb9.2.27 treatment. The interstitial volume fraction in the NK monotherapy group was significantly reduced compared to mAb9.2.27 monotherapy (p<0.0001) and untreated controls (p = 0.014) in the cohort 2 animals. NK cells in monotherapy were unable to kill the U87MG cells that highly expressed class I human leucocyte antigens, and diminished stress ligands for activating receptors. A significant association between apparent diffusion coefficient (ADC) of water and ve in combination NK+mAb9.2.27 and NK monotherapy treated tumours was evident, where increased ADC corresponded to reduced ve in both cases. Collectively, these data support histological measures at end-stage demonstrating diminished tumour cell proliferation and pronounced apoptosis in the NK+mAb9.2.27 treated tumours compared to the other groups. In conclusion, ve was the most reliable radiological parameter for detecting response to intralesional NK cellular therapy.
    Full-text · Article · Sep 2014 · PLoS ONE
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    ABSTRACT: Ependymona occasionally occurs outside the ventricular structures, which is called ectopic ependymona (EE), while pure cortex location is uncommon. However, cortical anaplastic ependymoma (CE) is rare, especially in children. There were only four primary CEs, which is located in the superficial cortex, were reported the age of the patient under 12 years old. The present case is a 20-month-old boy presenting with simple partial seizure was treated in our department. Cranial magnetic resonance imaging (MRI) revealed a fronto-parietal lobe mass of more than 50 mm in diameter with mixed signal intensity. Total removal of the mass lesion was performed without any neurological deficit. Pathological examination of the excised tumor were consistent with anaplastic ependymoma (AE). The patient had a good recovery after his surgical resection. Radiotherapy and chemotherapy were not taken into account in view of his age, the favorable site and the complete resection. The management of this unusual tumor is summarized in this paper.
    No preview · Article · Sep 2014 · Clinical Neurology and Neurosurgery
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    ABSTRACT: CIAPIN1 (cytokine-induced antiapoptotic inhibitor 1), was recently identified as an essential downstream effector of the Ras signaling pathway. However, its potential role in regulating myeloid differentiation remains unclear. In this study, we found depletion of CIAPIN1 by shRNAs led to granulocytic differentiation of K562 cells. Meanwhile, the decrease of NHE1 and up-regulation of phosphorylated ERK1/2 were observed after CIAPIN1 depletion. Interestingly, targeted inhibition of NHE1 further promoted the differentiation of K562 cells with CIAPIN1 silencing. Accordingly, ectopic expression of NHE1 reversed this phenotype. Furthermore, ERK1/2 inhibition with the chemical inhibitor, PD98059, abolished CIAPIN1 silencing-induced differentiation of K562 cells after NHE1 inhibition. Thus, our results revealed important mechanism that CIAPIN1 targeted NHE1 to mediate differentiation of K562 cells via ERK1/2 pathway. Our findings implied CIAPIN1 and NHE1 could be new targets in developing therapeutic strategies against leukemia.
    Full-text · Article · Sep 2014 · Leukemia Research

Publication Stats

2k Citations
346.99 Total Impact Points

Institutions

  • 2015
    • China National Petroleum Corporation
      Peping, Beijing, China
  • 2012-2015
    • Peking Union Medical College Hospital
      Peping, Beijing, China
  • 2006-2015
    • University of Bergen
      • Department of Biomedicine
      Bergen, Hordaland, Norway
  • 2005-2015
    • Fudan University
      • Department of Internal Medicine
      Shanghai, Shanghai Shi, China
  • 2014
    • Sun Yat-Sen University
      Shengcheng, Guangdong, China
    • Chongqing Cancer Hospital and Institute
      Ch’ung-ch’ing-shih, Chongqing Shi, China
  • 2013-2014
    • Sun Yat-Sen University Cancer Center
      • Department of Neurosurgery
      Shengcheng, Guangdong, China
    • Chinese Academy of Medical Sciences
      Peping, Beijing, China
  • 2011-2013
    • Chongqing Medical University
      Ch’ung-ch’ing-shih, Chongqing Shi, China