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Tumor dormancy

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https://www.readbyqxmd.com/read/28430641/the-regulation-of-%C3%AE-catenin-activity-and-function-in-cancer-therapeutic-opportunities
#1
REVIEW
Shuang Shang, Fang Hua, Zhuo-Wei Hu
Wnt/β-catenin signaling is an evolutionarily conserved and versatile pathway that is known to be involved in embryonic development, tissue homeostasis and a wide variety of human diseases. Aberrant activation of this pathway gives rise to the accumulation of β-catenin in the nucleus and promotes the transcription of many oncogenes such as c-Myc and CyclinD-1. As a result, it contributes to carcinogenesis and tumor progression of several cancers, including colon cancer, hepatocellular carcinoma, pancreatic cancer, lung cancer and ovarian cancer...
February 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28410147/the-roles-of-microglia-macrophages-in-tumor-progression-of-brain-cancer-and-metastatic-disease
#2
Shih-Ying Wu, Kounosuke Watabe
Malignant brain tumors and brain metastases are highly aggressive diseases that are often resistant to treatment. Consequently, the current prognosis of patients with brain tumors and metastases is dismal. Activated microglia and macrophages are often observed in close proximity to or within the malignant tumor masses, suggesting that microglia/macrophages play an important role in brain tumor progression. Microglia, being resident macrophages of the central nervous system, form a major component of the brain immune system...
June 1, 2017: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28391403/cytokine-induced-senescence-for-cancer-surveillance
#3
REVIEW
Thomas Wieder, Ellen Brenner, Heidi Braumüller, Oliver Bischof, Martin Röcken
The immune response is a first-line systemic defense to curb tumorigenesis and metastasis. Much effort has been invested to design antitumor interventions that would boost the immune system in its fight to defeat or contain cancerous growth. Tumor vaccination protocols, transfer of tumor-associated-antigen-specific T cells, T cell activity-regulating antibodies, and recombinant cytokines are counted among a toolbox filled with immunotherapeutic options. Although the mechanistic underpinnings of tumor immune control remain to be deciphered, these are studied with the goal of cancer cell destruction...
April 8, 2017: Cancer Metastasis Reviews
https://www.readbyqxmd.com/read/28390068/hostile-takeover-how-tumors-hijack-pre-existing-vascular-environments-to-thrive
#4
Frank Winkler
An increasing body of evidence suggests that solid tumors do not require the generation of new blood vessels, angiogenesis, to successfully grow, and to colonize normal tissue. Many tumor cells rather make best use of what they find: pre-existing blood vessels of the host. In these cases, the host vasculature is incorporated by the growing tumor, resulting in a new organ consisting of malignant and nonmalignant cell types. In consequence, pre-existing vessels are exploited by the tumor for optimal access to oxygen and nutrients...
April 8, 2017: Journal of Pathology
https://www.readbyqxmd.com/read/28344165/mechanisms-governing-metastatic-dormancy-in-breast-cancer
#5
REVIEW
Jürgen Dittmer
Breast cancer is a systemic disease characterized by early dissemination of tumor cells to distant organs. In this foreign environment, tumor cells may stay in a dormant state as single cells or as micrometastases for many years before growing out into a macrometastatic lesion. As metastasis is the primary cause for breast cancer-related death, it is important to understand the mechanisms underlying the maintenance of dormancy and dormancy escape to find druggable targets to eradicate metastatic tumor cells...
March 23, 2017: Seminars in Cancer Biology
https://www.readbyqxmd.com/read/28331999/the-acidic-microenvironment-as-a-possible-niche-of-dormant-tumor-cells
#6
REVIEW
Silvia Peppicelli, Elena Andreucci, Jessica Ruzzolini, Anna Laurenzana, Francesca Margheri, Gabriella Fibbi, Mario Del Rosso, Francesca Bianchini, Lido Calorini
Although surgical excision, chemo-, and radio-therapy are clearly advanced, tumors may relapse due to cells of the so-called "minimal residual disease". Indeed, small clusters of tumor cells persist in host tissues after treatment of the primary tumor elaborating strategies to survive and escape from immunological attacks before their relapse: this variable period of remission is known as "cancer dormancy". Therefore, it is crucial to understand and consider the major concepts addressing dormancy, to identify new targets and disclose potential clinical strategies...
March 22, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28314083/characterization-of-dormant-and-active-human-cancer-cells-by-quantitative-phase-imaging
#7
Peng Guo, Jing Huang, Marsha A Moses
The switch of tumor cells from a dormant, non-angiogenic phenotype to an active, angiogenic phenotype is a critical step in early cancer progression. To date, relatively little is known about the cellular behaviors of angiogenic and non-angiogenic tumor cell phenotypes. In this study, holographic imaging cytometry, a quantitative phase imaging (QPI) technique was used to continuously and non-invasively analyze, quantify, and compare a panel of fundamental cellular behaviors of angiogenic and non-angiogenic human osteosarcoma cells (KHOS) in a simple and economical way...
March 17, 2017: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
https://www.readbyqxmd.com/read/28262977/metastatic-breast-cancer-cells-enter-into-dormant-state-and-express-cancer-stem-cells-phenotype-under-chronic-hypoxia
#8
Alessandra Carcereri de Prati, Elena Butturini, Antonella Rigo, Elisa Oppici, Michele Rossin, Diana Boriero, Sofia Mariotto
Tumor dormancy is a poorly understood stage in cancer progression characterized by mitotic cycle arrest in G0/G1 phase and low metabolism. The cells survive in a quiescent state and wait for appropriate environmental conditions to begin proliferation again giving rise to metastasis. Despite their key role in cancer development and metastasis, the knowledge about their biology and origin is still very limited due to the poorness of established in vitro models that faithfully recapitulated tumor dormancy. Using at least three cycles of 1%O2 hypoxia and reoxygenation, we establish and characterize the hypoxia-resistant human breast cancer cell line chMDA-MB-231 that can stably survive under 1% O2 condition by entering into dormant state characterized by arrest in G0/G1 phase and low metabolism...
March 6, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28249168/autocrine-igf1-signaling-mediates-pancreatic-tumor-cell-dormancy-in-the-absence-of-oncogenic-drivers
#9
Nirakar Rajbhandari, Wan-Chi Lin, Barbara L Wehde, Aleata A Triplett, Kay-Uwe Wagner
Mutant KRAS and c-MYC are oncogenic drivers and rational therapeutic targets for the treatment of pancreatic cancer. Although tumor growth and homeostasis are largely dependent on these oncogenes, a few residual cancer cells are able to survive the ablation of mutant KRAS and c-MYC. By performing a genome-wide gene expression analysis of in vivo-derived bulk tumor cells and residual cancer cells lacking the expression of mutant KRAS or c-MYC, we have identified an increase in autocrine IGF1/AKT signaling as a common survival mechanism in dormant cancer cells...
February 28, 2017: Cell Reports
https://www.readbyqxmd.com/read/28202775/winter-is-coming-tumor-cells-go-into-hibernation
#10
Amanda W Lund
In response to hypoxia in the primary tumor microenvironment, tumor cells induce a state of dormancy enabling their persistence at metastatic sites and resistance to therapy.
February 15, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28197538/cancer-cell-cannibalism-and-the-sasp-ripples-in-the-murky-waters-of-tumor-dormancy
#11
Thomas J Bartosh
Relapse in cancer patients following an apparent cure and a prolonged latency period, known as tumor dormancy, remains an unrelenting clinical crisis. Here, I expand on our recent findings that potentially link cancer cell cannibalism of bone marrow-derived mesenchymal stem/stromal cells (BM-MSCs) to the senescence-associated secretory phenotype (SASP) and tumor dormancy.
2017: Molecular & Cellular Oncology
https://www.readbyqxmd.com/read/28196146/chemotherapy-induces-adaptive-drug-resistance-and-metastatic-potentials-via-phenotypic-cxcr4-expressing-cell-state-transition-in-ovarian-cancer
#12
Hyun Hee Lee, Vanessa Bellat, Benedict Law
Ovarian cancer (OVC) patients who receive chemotherapy often acquire drug resistance within one year. This can lead to tumor reoccurrence and metastasis, the major causes of mortality. We report a transient increase of a small distinctive CXCR4High/CD24Low cancer stem cell population (CXCR4High) in A2780 and SKOV-3 OVC cell lines in response to cisplatin, doxorubicin, and paclitaxel, treatments. The withdrawal of the drug challenges reversed this cell-state transition. CXCR4High exhibits dormancy in drug resistance and mesenchymal-like invasion, migration, colonization, and tumor formation properties...
2017: PloS One
https://www.readbyqxmd.com/read/28115701/induction-of-dormancy-in-hypoxic-human-papillomavirus-positive-cancer-cells
#13
Karin Hoppe-Seyler, Felicitas Bossler, Claudia Lohrey, Julia Bulkescher, Frank Rösl, Lars Jansen, Arnulf Mayer, Peter Vaupel, Matthias Dürst, Felix Hoppe-Seyler
Oncogenic human papillomaviruses (HPVs) are closely linked to major human malignancies, including cervical and head and neck cancers. It is widely assumed that HPV-positive cancer cells are under selection pressure to continuously express the viral E6/E7 oncogenes, that their intracellular p53 levels are reconstituted on E6/E7 repression, and that E6/E7 inhibition phenotypically results in cellular senescence. Here we show that hypoxic conditions, as are often found in subregions of cervical and head and neck cancers, enable HPV-positive cancer cells to escape from these regulatory principles: E6/E7 is efficiently repressed, yet, p53 levels do not increase...
February 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28039473/nanometronomic-treatment-of-4t1-breast-cancer-with-nanocaged-doxorubicin-prevents-drug-resistance-and-circumvents-cardiotoxicity
#14
Serena Mazzucchelli, Michela Bellini, Luisa Fiandra, Marta Truffi, Maria A Rizzuto, Luca Sorrentino, Erika Longhi, Manuela Nebuloni, Davide Prosperi, Fabio Corsi
Chemotherapeutic treatment of breast cancer is based on maximum tolerated dose (MTD) approach. However, advanced stage tumors are not effectively eradicated by MTD owing to suboptimal drug targeting, onset of therapeutic resistance and neoangiogenesis. In contrast, "metronomic" chemotherapy is based on frequent drug administrations at lower doses, resulting in neovascularization inhibition and induction of tumor dormancy. Here we show the potential of H-ferritin (HFn)-mediated targeted nanodelivery of metronomic doxorubicin (DOX) in the setting of a highly aggressive and metastatic 4T1 breast cancer mouse model with DOX-inducible expression of chemoresistance...
January 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/28039467/targeting-cancer-stem-cell-propagation-with-palbociclib-a-cdk4-6-inhibitor-telomerase-drives-tumor-cell-heterogeneity
#15
Gloria Bonuccelli, Maria Peiris-Pages, Bela Ozsvari, Ubaldo E Martinez-Outschoorn, Federica Sotgia, Michael P Lisanti
In this report, we systematically examined the role of telomerase activity in lung and ovarian cancer stem cell (CSC) propagation. For this purpose, we indirectly gauged telomerase activity, by linking the hTERT-promoter to eGFP. Using lung (A549) and ovarian (SKOV3) cancer cells, transduced with the hTERT-GFP reporter, we then employed GFP-expression levels to fractionate these cell lines into GFP-high and GFP-low populations. We functionally compared the phenotype of these GFP-high and GFP-low populations...
February 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/28031411/a-systematic-analysis-of-negative-growth-control-implicates-the-dream-complex-in-cancer-cell-dormancy
#16
James MacDonald, Yudith Ramos-Valdes, Pirunthan Perampalam, Larissa Litovchick, Gabriel E DiMattia, Frederick A Dick
Epithelial ovarian cancer (EOC) generates multicellular aggregates called spheroids that detach from the primary tumor and disseminate through ascites. Spheroids possess a number of characteristics of tumor dormancy including withdrawal from the cell cycle and resistance to chemotherapeutics. This report systematically analyzes the effects of RNAi depletion of 21 genes that are known to contribute to negative regulation of the cell cycle in 10 ovarian cancer cell lines. Interestingly, spheroid cell viability was compromised by loss of some cyclin-dependent kinase inhibitors such as p57(Kip2), as well as Dyrk1A, Lin52, and E2F5 in most cell lines tested...
December 28, 2016: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28017284/tumor-cell-dormancy
#17
REVIEW
Roger R Gomis, Sylwia Gawrzak
Metastasis is the primary cause of death in cancer patients and current treatments fail to provide durable responses. Efforts to treat metastatic disease are hindered by the fact that metastatic cells often remain dormant for prolonged intervals of years, or even decades. Tumor dormancy reflects the capability of disseminated tumor cells (DTCs), or micrometastases, to evade treatment and remain at low numbers after primary tumor resection. Unfortunately, dormant cells will eventually produce overt metastasis...
October 7, 2016: Molecular Oncology
https://www.readbyqxmd.com/read/27982511/biochemical-changes-in-the-niche-following-tumor-cell-invasion
#18
A M Decker, F C Cackowski, Y Jung, R S Taichman
Metastatic cancer is the leading cause of all cancer related deaths. Prostate cancer (PCa) metastasizes preferentially to the bone marrow, specifically within the endosteal niche. Endosteal cells secrete homing molecules that may recruit PCa cells to the bone marrow. Once there, the biochemical signature of this niche regulates PCa fate including cellular dormancy or cell cycle arrest, reactivation and resistance to chemotherapeutics. Growth factors, interleukins, adhesion molecules, as well as extra-cellular matrix proteins can collectively change the phenotype of PCa cells...
December 16, 2016: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/27959896/the-role-of-regulatory-b-cell-like-malignant-cells-and-treg-cells-in-the-mouse-model-of-bcl1-tumor-dormancy
#19
Andrew BitMansour, Laurentiu M Pop, Ellen S Vitetta
Cancer dormancy is a clinical state in which residual tumor cells persist for long periods of time but do not cause detectable disease. In the mouse B cell lymphoma model (BCL1), dormancy can be induced and maintained by immunizing mice with a soluble form of the IgM expressed on the surface of the tumor cells. Immunization induces an anti-idiotype antibody response that maintains dormancy. Mice with dormant tumor have low numbers of BCL1 cells in their spleens that divide and are killed at the same rate. When the anti-Id antibodies wane, the tumor cells grow rapidly and kill the host...
2016: PloS One
https://www.readbyqxmd.com/read/27928096/extremely-late-recurrence-21-years-after-total-removal-of-immature-teratoma-a-case-report-and-literature-review
#20
Yui Mano, Masayuki Kanamori, Toshihiro Kumabe, Ryuta Saito, Mika Watanabe, Yukihiko Sonoda, Teiji Tominaga
Immature teratoma (IMT) is normally treated by resection and adjuvant therapy. The present unusual case of recurrent germinoma occurred 21 years after total resection of pineal IMT. A 3-year-old boy presented with headache, disturbance of consciousness, and Parinaud's syndrome. Magnetic resonance (MR) imaging revealed a pineal mass lesion, and total resection of the tumor was achieved. The histological diagnosis was mature teratoma. He did not receive further treatment, and did well without recurrence for 20 years...
January 15, 2017: Neurologia Medico-chirurgica
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