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Oncology

  • 1,309 Articles
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Ribosomal RACK1 promotes chemoresistance and growth in human hepatocellular carcinoma
Yuanyuan Ruan, … , Aiguo Shen, Jianxin Gu
Yuanyuan Ruan, … , Aiguo Shen, Jianxin Gu
Published June 1, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI58488.
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Ribosomal RACK1 promotes chemoresistance and growth in human hepatocellular carcinoma

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Abstract

Coordinated translation initiation is coupled with cell cycle progression and cell growth, whereas excessive ribosome biogenesis and translation initiation often lead to tumor transformation and survival. Hepatocellular carcinoma (HCC) is among the most common and aggressive cancers worldwide and generally displays inherently high resistance to chemotherapeutic drugs. We found that RACK1, the receptor for activated C-kinase 1, was highly expressed in normal liver and frequently upregulated in HCC. Aberrant expression of RACK1 contributed to in vitro chemoresistance as well as in vivo tumor growth of HCC. These effects depended on ribosome localization of RACK1. Ribosomal RACK1 coupled with PKCβII to promote the phosphorylation of eukaryotic initiation factor 4E (eIF4E), which led to preferential translation of the potent factors involved in growth and survival. Inhibition of PKCβII or depletion of eIF4E abolished RACK1-mediated chemotherapy resistance of HCC in vitro. Our results imply that RACK1 may function as an internal factor involved in the growth and survival of HCC and suggest that targeting RACK1 may be an efficacious strategy for HCC treatment.

Authors

Yuanyuan Ruan, Linlin Sun, Yuqing Hao, Lijing Wang, Jiejie Xu, Wen Zhang, Jianhui Xie, Liang Guo, Lei Zhou, Xiaojing Yun, Hongguang Zhu, Aiguo Shen, Jianxin Gu

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CHK1 targets spleen tyrosine kinase (L) for proteolysis in hepatocellular carcinoma
Jian Hong, … , Yi-Xin Zeng, Tiebang Kang
Jian Hong, … , Yi-Xin Zeng, Tiebang Kang
Published May 15, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI61380.
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CHK1 targets spleen tyrosine kinase (L) for proteolysis in hepatocellular carcinoma

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Abstract

Hepatocellular carcinoma (HCC) is one of the most prevalent malignancies resistant to current chemotherapies or radiotherapies, which makes it urgent to identify new therapeutic targets for HCC. In this study, we found that checkpoint kinase 1 (CHK1) was frequently overexpressed and correlated with poor clinical outcome in patients with HCC. We further showed that the CHK1 inhibitor GÖ6976 was capable of sensitizing HCC cells to cisplatin, indicating that CHK1 may have oncogenic function in HCC. We found that CHK1 phosphorylated the tumor suppressor spleen tyrosine kinase (L) (SYK[L]) and identified the phosphorylation site at Ser295. Furthermore, CHK1 phosphorylation of SYK(L) promoted its subsequent proteasomal degradation. Expression of a nonphosphorylated mutant of SYK(L) was more efficient at suppressing proliferation, colony formation, mobility, and tumor growth in HCC lines. Importantly, a strong inverse correlation between the expression levels of CHK1 and SYK(L) was observed in patients with HCC. Collectively, our data demonstrate that SYK(L) is a substrate of CHK1 in tumor cells and suggest that targeting the CHK1/SYK(L) pathway may be a promising strategy for treating HCC.

Authors

Jian Hong, Kaishun Hu, Yunfei Yuan, Yi Sang, Qiangui Bu, Guihua Chen, Longjun Yang, Binkui Li, Pinzhu Huang, Dongtai Chen, Yi Liang, Ruhua Zhang, Jingxuan Pan, Yi-Xin Zeng, Tiebang Kang

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Ganglioside GD2 identifies breast cancer stem cells and promotes tumorigenesis
Venkata Lokesh Battula, … , Sendurai A. Mani, Michael Andreeff
Venkata Lokesh Battula, … , Sendurai A. Mani, Michael Andreeff
Published May 15, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI59735.
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Ganglioside GD2 identifies breast cancer stem cells and promotes tumorigenesis

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Abstract

Cancer stem cells (CSCs) are a small subpopulation of cancer cells that have increased resistance to conventional therapies and are capable of establishing metastasis. However, only a few biomarkers of CSCs have been identified. Here, we report that ganglioside GD2 (a glycosphingolipid) identifies a small fraction of cells in human breast cancer cell lines and patient samples that are capable of forming mammospheres and initiating tumors with as few as 10 GD2+ cells. In addition, the majority of GD2+ cells are also CD44hiCD24lo, the previously established CSC-associated cell surface phenotype. Gene expression analysis revealed that GD3 synthase (GD3S) is highly expressed in GD2+ as well as in CD44hiCD24lo cells and that interference with GD3S expression, either by shRNA or using a pharmacological inhibitor, reduced the CSC population and CSC-associated properties. GD3S knockdown completely abrogated tumor formation in vivo. Also, induction of epithelial-mesenchymal transition (EMT) in transformed human mammary epithelial cells (HMLER cells) dramatically increased GD2 as well as GD3S expression in these cells, suggesting a role of EMT in the origin of GD2+ breast CSCs. In summary, we identified GD2 as a new CSC-specific cell surface marker and GD3S as a potential therapeutic target for CSCs, with the possibility of improving survival and cure rates in patients with breast cancer.

Authors

Venkata Lokesh Battula, Yuexi Shi, Kurt W. Evans, Rui-Yu Wang, Erika L. Spaeth, Rodrigo O. Jacamo, Rudy Guerra, Aysegul A. Sahin, Frank C. Marini, Gabriel Hortobagyi, Sendurai A. Mani, Michael Andreeff

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Nuclear protein 1 promotes pancreatic cancer development and protects cells from stress by inhibiting apoptosis
Tewfik Hamidi, … , Roland Michael Schmid, Juan Lucio Iovanna
Tewfik Hamidi, … , Roland Michael Schmid, Juan Lucio Iovanna
Published May 8, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI60144.
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Nuclear protein 1 promotes pancreatic cancer development and protects cells from stress by inhibiting apoptosis

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Abstract

Pancreatic ductal adenocarcinoma (PDAC) has the lowest survival rate of all cancers and shows remarkable resistance to cell stress. Nuclear protein 1 (Nupr1), which mediates stress response in the pancreas, is frequently upregulated in pancreatic cancer. Here, we report that Nupr1 plays an essential role in pancreatic tumorigenesis. In a mouse model of pancreatic cancer with constitutively expressed oncogenic KrasG12D, we found that loss of Nupr1 protected from the development of pancreatic intraepithelial neoplasias (PanINs). Further, in cultured pancreatic cells, nutrient deprivation activated Nupr1 expression, which we found to be required for cell survival. We found that Nupr1 protected cells from stress-induced death by inhibiting apoptosis through a pathway dependent on transcription factor RelB and immediate early response 3 (IER3). NUPR1, RELB, and IER3 proteins were coexpressed in mouse PanINs from KrasG12D-expressing pancreas. Moreover, pancreas-specific deletion of Relb in a KrasG12D background resulted in delayed in PanIN development associated with a lack of IER3 expression. Thus, efficient PanIN formation was dependent on the expression of Nupr1 and Relb, with likely involvement of IER3. Finally, in patients with PDAC, expression of NUPR1, RELB, and IER3 was significantly correlated with a poor prognosis. Cumulatively, these results reveal a NUPR1/RELB/IER3 stress-related pathway that is required for oncogenic KrasG12D-dependent transformation of the pancreas.

Authors

Tewfik Hamidi, Hana Algül, Carla Eliana Cano, Maria José Sandi, Maria Inés Molejon, Marc Riemann, Ezequiel Luis Calvo, Gwen Lomberk, Jean-Charles Dagorn, Falk Weih, Raul Urrutia, Roland Michael Schmid, Juan Lucio Iovanna

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IL-15 protects NKT cells from inhibition by tumor-associated macrophages and enhances antimetastatic activity
Daofeng Liu, … , Gianpietro Dotti, Leonid S. Metelitsa
Daofeng Liu, … , Gianpietro Dotti, Leonid S. Metelitsa
Published May 8, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI59535.
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IL-15 protects NKT cells from inhibition by tumor-associated macrophages and enhances antimetastatic activity

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Abstract

Vα24-invariant NKT cells inhibit tumor growth by targeting tumor-associated macrophages (TAMs). Tumor progression therefore requires that TAMs evade NKT cell activity through yet-unknown mechanisms. Here we report that a subset of cells in neuroblastoma (NB) cell lines and primary tumors expresses membrane-bound TNF-α (mbTNF-α). These proinflammatory tumor cells induced production of the chemokine CCL20 from TAMs via activation of the NF-κB signaling pathway, an effect that was amplified in hypoxia. Flow cytometry analyses of human primary NB tumors revealed selective accumulation of CCL20 in TAMs. Neutralization of the chemokine inhibited in vitro migration of NKT cells toward tumor-conditioned hypoxic monocytes and localization of NKT cells to NB grafts in mice. We also found that hypoxia impaired NKT cell viability and function. Thus, CCL20-producing TAMs served as a hypoxic trap for tumor-infiltrating NKT cells. IL-15 protected antigen-activated NKT cells from hypoxia, and transgenic expression of IL-15 in adoptively transferred NKT cells dramatically enhanced their antimetastatic activity in mice. Thus, tumor-induced chemokine production in hypoxic TAMs and consequent chemoattraction and inhibition of NKT cells represents a mechanism of immune escape that can be reversed by adoptive immunotherapy with IL-15–transduced NKT cells.

Authors

Daofeng Liu, Liping Song, Jie Wei, Amy N. Courtney, Xiuhua Gao, Ekaterina Marinova, Linjie Guo, Andras Heczey, Shahab Asgharzadeh, Eugene Kim, Gianpietro Dotti, Leonid S. Metelitsa

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CD19 is a major B cell receptor–independent activator of MYC-driven B-lymphomagenesis
Elaine Y. Chung, … , Mitchell J. Weiss, Andrei Thomas-Tikhonenko
Elaine Y. Chung, … , Mitchell J. Weiss, Andrei Thomas-Tikhonenko
Published May 1, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI45851.
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CD19 is a major B cell receptor–independent activator of MYC-driven B-lymphomagenesis

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Abstract

PAX5, a B cell–specific transcription factor, is overexpressed through chromosomal translocations in a subset of B cell lymphomas. Previously, we had shown that activation of immunoreceptor tyrosine-based activation motif (ITAM) proteins and B cell receptor (BCR) signaling by PAX5 contributes to B-lymphomagenesis. However, the effect of PAX5 on other oncogenic transcription factor-controlled pathways is unknown. Using a MYC-induced murine lymphoma model as well as MYC-transformed human B cell lines, we found that PAX5 controls c-MYC protein stability and steady-state levels. This promoter-independent, posttranslational mechanism of c-MYC regulation was independent of ITAM/BCR activity. Instead it was controlled by another PAX5 target, CD19, through the PI3K-AKT-GSK3β axis. Consequently, MYC levels in B cells from CD19-deficient mice were sharply reduced. Conversely, reexpression of CD19 in murine lymphomas with spontaneous silencing of PAX5 boosted MYC levels, expression of its key target genes, cell proliferation in vitro, and overall tumor growth in vivo. In human B-lymphomas, CD19 mRNA levels were found to correlate with those of MYC-activated genes. They also negatively correlated with the overall survival of patients with lymphoma in the same way that MYC levels do. Thus, CD19 is a major BCR-independent regulator of MYC-driven neoplastic growth in B cell neoplasms.

Authors

Elaine Y. Chung, James N. Psathas, Duonan Yu, Yimei Li, Mitchell J. Weiss, Andrei Thomas-Tikhonenko

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Akt-mediated phosphorylation of Bmi1 modulates its oncogenic potential, E3 ligase activity, and DNA damage repair activity in mouse prostate cancer
Karim Nacerddine, … , Shridar Ganesan, Maarten van Lohuizen
Karim Nacerddine, … , Shridar Ganesan, Maarten van Lohuizen
Published April 16, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI57477.
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Akt-mediated phosphorylation of Bmi1 modulates its oncogenic potential, E3 ligase activity, and DNA damage repair activity in mouse prostate cancer

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Abstract

Prostate cancer (PCa) is a major lethal malignancy in men, but the molecular events and their interplay underlying prostate carcinogenesis remain poorly understood. Epigenetic events and the upregulation of polycomb group silencing proteins including Bmi1 have been described to occur during PCa progression. Here, we found that conditional overexpression of Bmi1 in mice induced prostatic intraepithelial neoplasia, and elicited invasive adenocarcinoma when combined with PTEN haploinsufficiency. In addition, Bmi1 and the PI3K/Akt pathway were coactivated in a substantial fraction of human high-grade tumors. We found that Akt mediated Bmi1 phosphorylation, enhancing its oncogenic potential in an Ink4a/Arf-independent manner. This process also modulated the DNA damage response and affected genomic stability. Together, our findings demonstrate the etiological role of Bmi1 in PCa, unravel an oncogenic collaboration between Bmi1 and the PI3K/Akt pathway, and provide mechanistic insights into the modulation of Bmi1 function by phosphorylation during prostate carcinogenesis.

Authors

Karim Nacerddine, Jean-Bernard Beaudry, Vasudeva Ginjala, Bart Westerman, Francesca Mattiroli, Ji-Ying Song, Henk van der Poel, Olga Balagué Ponz, Colin Pritchard, Paulien Cornelissen-Steijger, John Zevenhoven, Ellen Tanger, Titia K. Sixma, Shridar Ganesan, Maarten van Lohuizen

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ERK3 signals through SRC-3 coactivator to promote human lung cancer cell invasion
Weiwen Long, … , Ming-Jer Tsai, Bert W. O’Malley
Weiwen Long, … , Ming-Jer Tsai, Bert W. O’Malley
Published April 16, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI61492.
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ERK3 signals through SRC-3 coactivator to promote human lung cancer cell invasion

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Abstract

In contrast to the well-studied classic MAPKs, such as ERK1/2, little is known concerning the regulation and substrates of the atypical MAPK ERK3 signaling cascade and its function in cancer progression. Here, we report that ERK3 interacted with and phosphorylated steroid receptor coactivator 3 (SRC-3), an oncogenic protein overexpressed in multiple human cancers at serine 857 (S857). This ERK3-mediated phosphorylation at S857 was essential for interaction of SRC-3 with the ETS transcription factor PEA3, which promotes upregulation of MMP gene expression and proinvasive activity in lung cancer cells. Importantly, knockdown of ERK3 or SRC-3 inhibited the ability of lung cancer cells to invade and form tumors in the lung in a xenograft mouse model. In addition, ERK3 was found to be highly upregulated in human lung carcinomas. Our study identifies a previously unknown role for ERK3 in promoting lung cancer cell invasiveness by phosphorylating SRC-3 and regulating SRC-3 proinvasive activity by site-specific phosphorylation. As such, ERK3 protein kinase may be an attractive target for therapeutic treatment of invasive lung cancer.

Authors

Weiwen Long, Charles E. Foulds, Jun Qin, Jian Liu, Chen Ding, David M. Lonard, Luisa M. Solis, Ignacio I. Wistuba, Jun Qin, Sophia Y. Tsai, Ming-Jer Tsai, Bert W. O’Malley

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Epithelial-mesenchymal transition can suppress major attributes of human epithelial tumor-initiating cells
Toni Celià-Terrassa, … , Pedro L. Fernández, Timothy M. Thomson
Toni Celià-Terrassa, … , Pedro L. Fernández, Timothy M. Thomson
Published April 16, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI59218.
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Epithelial-mesenchymal transition can suppress major attributes of human epithelial tumor-initiating cells

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Abstract

Malignant progression in cancer requires populations of tumor-initiating cells (TICs) endowed with unlimited self renewal, survival under stress, and establishment of distant metastases. Additionally, the acquisition of invasive properties driven by epithelial-mesenchymal transition (EMT) is critical for the evolution of neoplastic cells into fully metastatic populations. Here, we characterize 2 human cellular models derived from prostate and bladder cancer cell lines to better understand the relationship between TIC and EMT programs in local invasiveness and distant metastasis. The model tumor subpopulations that expressed a strong epithelial gene program were enriched in highly metastatic TICs, while a second subpopulation with stable mesenchymal traits was impoverished in TICs. Constitutive overexpression of the transcription factor Snai1 in the epithelial/TIC-enriched populations engaged a mesenchymal gene program and suppressed their self renewal and metastatic phenotypes. Conversely, knockdown of EMT factors in the mesenchymal-like prostate cancer cell subpopulation caused a gain in epithelial features and properties of TICs. Both tumor cell subpopulations cooperated so that the nonmetastatic mesenchymal-like prostate cancer subpopulation enhanced the in vitro invasiveness of the metastatic epithelial subpopulation and, in vivo, promoted the escape of the latter from primary implantation sites and accelerated their metastatic colonization. Our models provide new insights into how dynamic interactions among epithelial, self-renewal, and mesenchymal gene programs determine the plasticity of epithelial TICs.

Authors

Toni Celià-Terrassa, Óscar Meca-Cortés, Francesca Mateo, Alexia Martínez de Paz, Nuria Rubio, Anna Arnal-Estapé, Brian J. Ell, Raquel Bermudo, Alba Díaz, Marta Guerra-Rebollo, Juan José Lozano, Conchi Estarás, Catalina Ulloa, Daniel ρlvarez-Simón, Jordi Milà, Ramón Vilella, Rosanna Paciucci, Marian Martínez-Balbás, Antonio García de Herreros, Roger R. Gomis, Yibin Kang, Jerónimo Blanco, Pedro L. Fernández, Timothy M. Thomson

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Comparing human pancreatic cell secretomes by in vitro aptamer selection identifies cyclophilin B as a candidate pancreatic cancer biomarker
Partha Ray, … , Bruce A. Sullenger, Rebekah R. White
Partha Ray, … , Bruce A. Sullenger, Rebekah R. White
Published April 9, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI62385.
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Comparing human pancreatic cell secretomes by in vitro aptamer selection identifies cyclophilin B as a candidate pancreatic cancer biomarker

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Abstract

Most cases of pancreatic cancer are not diagnosed until they are no longer curable with surgery. Therefore, it is critical to develop a sensitive, preferably noninvasive, method for detecting the disease at an earlier stage. In order to identify biomarkers for pancreatic cancer, we devised an in vitro positive/negative selection strategy to identify RNA ligands (aptamers) that could detect structural differences between the secretomes of pancreatic cancer and non-cancerous cells. Using this molecular recognition approach, we identified an aptamer (M9-5) that differentially bound conditioned media from cancerous and non-cancerous human pancreatic cell lines. This aptamer further discriminated between the sera of pancreatic cancer patients and healthy volunteers with high sensitivity and specificity. We utilized biochemical purification methods and mass-spectrometric analysis to identify the M9-5 target as cyclophilin B (CypB). This molecular recognition–based strategy simultaneously identified CypB as a serum biomarker and generated a new reagent to recognize it in body fluids. Moreover, this approach should be generalizable to other diseases and complementary to traditional approaches that focus on differences in expression level between samples. Finally, we suggest that the aptamer we identified has the potential to serve as a tool for the early detection of pancreatic cancer.

Authors

Partha Ray, Kristy L. Rialon-Guevara, Emanuela Veras, Bruce A. Sullenger, Rebekah R. White

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E2F8 keeps liver cancer at bay
Alain de Bruin, Gustavo Leone, and colleagues find that the E2F8-mediated transcriptional repression in the developing liver suppresses hepatocellular carcinoma later in life …
Published July 25, 2016
Scientific Show StopperOncology

AIDing and abetting UV-independent skin cancer
Taichiro Nonaka and colleagues find that AID plays a role in the development of inflammation-driven, non-UV skin cancer
Published March 14, 2016
Scientific Show StopperOncology

CD37 keeps B cell lymphoma at bay
Charlotte de Winde, Sharon Veenbergen, and colleagues demonstrate that loss of CD37 expression relieves SOCS3-mediated suppression of IL-6 signaling and supports the development of B cell lymphoma…
Published January 19, 2016
Scientific Show StopperOncology

Maintaining endometrial epithelial barrier function
Jessica Bowser and colleagues identify a mechanism by which loss of CD73 promotes endometrial cancer progression…
Published December 7, 2015
Scientific Show StopperOncology

Sleuthing out the cellular source of hepatocellular carcinoma
Xueru Mu, Regina Español-Suñer, and colleagues show that tumors in murine hepatocellular carcinoma models are derived from hepatocytes and not from other liver resident cells …
Published September 8, 2015
Scientific Show StopperOncology

Live animal imaging in the far red
Ming Zhang and colleagues developed a far-red-absorbing reporter/probe system that can be used to image live animals and overcomes imaging limitations associated with conventional systems that use lower wavelengths of light…
Published September 8, 2015
Scientific Show StopperTechnical AdvanceOncology

Cancer cells fight off stress with ATF4
Souvik Dey, Carly Sayers, and colleagues reveal that activation of heme oxygenase 1 by ATF4 protects cancer cells from ECM detachment-induced death and promotes metastasis…
Published May 26, 2015
Scientific Show StopperOncology

Smothering Von Hippel-Lindau syndrome-associated phenotypes
Ana Metelo and colleagues demonstrate that specific inhibition of HIF2a ameliorates VHL-associated phenotypes and improves survival in a zebrafish model of disease…
Published April 13, 2015
Scientific Show StopperOncology

Blazing the trail for metastasis
Jill Westcott, Amanda Prechtl, and colleagues identify an epigenetically distinct population of breast cancer cells that promotes collective invasion…
Published April 6, 2015
Scientific Show StopperOncology

Dynamic focal adhesions
Wies van Roosmalen, Sylvia E. Le Dévédec, and colleagues screen for genes that alter cancer cell migration and demonstrate that SRPK1 promotes metastasis...
Published March 16, 2015
Scientific Show StopperOncology
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