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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Novel therapeutic approaches and biomarkers for nasopharyngeal carcinoma / CUHK electronic theses & dissertations collection

January 2014 (has links)
Ma, Buig Yue Brigette. / Thesis M.D. Chinese University of Hong Kong 2014. / Includes bibliographical references (leaves 232-270). / Title from PDF title page (viewed on 18, November, 2016).
2

Advances in nasopharyngeal cancer: new targets, biomarkers and therapies. / CUHK electronic theses & dissertations collection

January 2011 (has links)
Nasopharyngeal cancer (NPC) is endemic in Southern China and Hong Kong. It has traditionally been treated by local radiotherapy with great success especially for early stage disease. However the treatment outcome in advanced stage disease is unsatisfactory. / Results from this series of combined clinical, translational and laboratory studies have redefined the role of hypoxia, angiogenesis and metastasis as new therapeutic targets in NPC. Novel biomarkers and new therapeutic approaches were developed based on these targets. / To develop new therapies in NPC, we demonstrated in a randomized controlled phase 2 clinical trial that sequential therapy of neoadjuvant chemotherapy followed by chemoradiotherapy was well tolerated with a manageable toxicity profile that allowed subsequent delivery of full dose chemoradiotherapy. This strategy reduced distant metastasis which translated into improved patient survival. In preclinical studies, the antiangiogenesis agent sunitinib demonstrated potent in vitro and in vivo growth inhibition in NPC. In a phase 2 clinical trial, sunitinib demonstrated modest clinical activity in heavily pretreated NPC patients. However, the unexpected high incidence of severe hemorrhage from upper aero-digestive tract in NPC patients who received prior high dose RT to the region is of concern. We propose to exclude NPC patients with disease recurrence within previous radiation field and/or with vascular invasion from future antiangiogenesis therapy. / To investigate potential new therapeutic targets and biomarkers in NPC, we first confirmed from the Hong Kong NPC study group of 2915 patients' database that distant metastasis was the leading cause of NPC failure after primary radiotherapy. We further showed that hypoxia induced broad changes of both up- and down-regulated gene expressions involved in diverse biological processes in NPC cells. Over-expression of biomarkers of hypoxia and angiogenesis (including HIF-1alpha, CA IX and VEGF) is common in NPC and is associated with poor prognosis. Elevated plasma osteopontin is a biomarker of distant metastasis, and pre-treatment plasma osteopontin level may be a useful biomarker of response to radiotherapy in NPC. / Hui, Pun. / "September 2010." / Adviser: Anthony Chan. / Source: Dissertation Abstracts International, Volume: 73-04, Section: B, page: . / Thesis (M.D.)--Chinese University of Hong Kong, 2011. / Includes bibliographical references (leaves 269-293). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
3

The effect of a selective COX-2 inhibitor, celecoxib, on the proliferation, apoptosis and differential protein expression in nasopharyngeal carcinoma cell lines. / 選擇性環氧合酶-2抑製劑, 塞來昔布, 對於鼻咽癌細胞系之增生, 細胞凋亡及蛋白差異表達的影響 / CUHK electronic theses & dissertations collection / Xuan ze xing huan yang he mei-2 yi zhi ji, sai lai xi bu, dui yu bi yan ai xi bao xi zhi zeng sheng, xi bao diao wang ji dan bai cha yi biao da de ying xiang

January 2008 (has links)
Celecoxib is a COX-2 selective non-steroidal anti-inflammatory drug which has been shown to inhibit growth and induce apoptosis in various cancer cell lines. Using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay and an apoptosis detection kit, we demonstrated that celecoxib was able to induce growth inhibition and apoptosis in a dose-dependent manner in 3 NPC cell lines: HK-1, Hone-1, and C666-1. Afterwards, a proteomic approach was used to study the underlying mechanisms involved in celecoxib-mediated effects on two COX-2 positive NPC cell lines (HK-1 and C666-1). Results showed that a total of 18 protein spots were differentially expressed in the HK-1 and C666-1 cells. On the other hand, we also compared the proteomic expression profile between an NPC cell line (C666-1) and a normal nasopharynx cell line (NP69) in order to study whether those differentially expressed proteins after celecoxib treatment were also involved in NPC carcinogenesis. Proteomics results with confirmation using Western blotting discovered that HSP27 phosphorylated of serine 82 (HSP27-pSer82) protein was up-regulated in C666-1 cells when compared with that in NP69 cells. After treatment with celecoxib, expression of HSP27-pSer82 protein was down-regulated in both HK-1 and C666-1 cells. These findings suggest that down-regulation of HSP27-pSer82 protein expression may have mediated the growth-inhibitory effects of celecoxib in HK-1 and C666-1 cells. Finally, other differential expressed proteins identified from proteomics with confirmation by immunocytochemical staining in the 2 NPC cell lines and 40 NPC patient specimens showed that down-regulation of annexin 2 and beta2-tubulin may be important in NPC formation. / COX-2 over-expression has been found in various cancers such as colorectal cancer, liver cancer and lung cancer. In vivo studies have shown that mice overexpressing COX-2 developed breast cancer whereas COX-2 knockout mice had reduced rates of cancer formation in the intestines and skin. In the present study, COX-2 expression in NPC patient biopsies was examined and correlated with the clinicopathological data of the patients. Immunocytochemical staining showed that COX-2 protein was over-expressed in 84.6% (66/78) of non-metastatic NPC patients and was associated with an advanced nodal stage (P<0.05). All these data support an important role for COX-2 in NPC pathogenesis. / In summary, this study is the first to identify HSP27-pSer82 protein as a potential target of celecoxib in NPC cells. Detailed investigations of the functional role of molecular targets identified in this study would improve our understanding of the chemotherapeutic effects of celecoxib and, in the long run, may lead to a more effective chemotherapeutic treatment to this common cancer. / Nasopharyngeal carcinoma (NPC) is prevalent in southern China. Although early stage patients have a high rate of cure with radiotherapy alone, the prognosis for those with stage III or IV disease remains poor due to subsequent development of distant metastases. Therefore there is an urgent need to develop novel biologic agents to improve treatment outcomes. / Chan, Ming Lok. / Adviser: Anthony T.C. Chan. / Source: Dissertation Abstracts International, Volume: 70-06, Section: B, page: 3418. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references (leaves 141-171). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts in English and Chinese. / School code: 1307.
4

Cancer stem-like cell properties of drug-resistant nasopharyngeal carcinoma cells. / CUHK electronic theses & dissertations collection

January 2013 (has links)
Choi, Pui Ying. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2013. / Includes bibliographical references (leaves 101-122). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts also in Chinese.
5

Clinical studies of immunomodulatory activities of yunzhi-danshen in breast cancer and nasopharyngeal carcinoma patients, and lingzhi-san miao san in rheumatoid arthritis patients. / CUHK electronic theses & dissertations collection

January 2005 (has links)
Eighty-two patients with breast cancer, twenty-seven patients with nasopharyngeal carcinoma and sixty-five patients with rheumatoid arthritis in this study were selected based on voluntary, randomization and double blind grouping criteria. / In nasopharyngeal carcinoma patients, the decrease in percentage and the absolute count of T lymphocytes in the TCM group was significantly lower than those in the placebo group. Besides, the decrease of the absolute count of T helper and T suppressor in the TCM group was significantly lower than that in the placebo group (all p < 0.05). The decrease may be due to radiotherapy. However, there was no significant difference in plasma sIL-2R and soluble tumor necrosis factor receptor 2 (sTNFR2) between the TCM group and the placebo group. / In rheumatoid arthritis patients, there was no significant difference in plasma. C-reactive protein (CRP), in the percentage, absolute count, and the ratio of CD4+/CD8+/NK/B lymphocytes between the TCM group and the placebo group. / Results showed that the absolute count of T helper lymphocytes (CD4+), the ratio of T helper lymphocytes (CD4+)/T suppressor and cytotoxic lymphocytes (CD8+), and the percentage and the absolute count of B lymphocytes were significantly elevated in the patients with breast cancer after taking Yunzhi-Danshen capsules, while plasma soluble interleukin-2 receptor (sIL-2R) concentration was significantly decreased (all p < 0.05). / This study shows that the selected traditional Chinese medicine have determinable immunomodulatory effects in patients with cancer and rheumatoid arthritis. (Abstract shortened by UMI.) / Traditional Chinese medicine (TCM) has been used to treat chronic diseases and tumor allegedly by immunomodulatory mechanisms. Breast cancer and nasopharyngeal cancer are prevalent carcinoma diseases in Hong Kong. The immune system of such patients could be adversely affected during the course of conventional chemotherapy or radiotherapy. Rheumatoid arthritis is an inflammatory autoimmune disease of the joints. The aim of this study was to assess the immunomodulatory effects of TCM Yunzhi-Danshen in auxiliary treatment of both kinds of cancer patients, and Lingzhi (Ganoderma Lucidum)-San Miao San ( Atractylodes lancea, Phellodendron amurense and Achyranthes bidentata B1) in supplementation treatment of patients with rheumatoid arthritis. / by Bao Yixi. / "July 2005." / Adviser: Wai-Kei Lam. / Source: Dissertation Abstracts International, Volume: 67-01, Section: B, page: 0166. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references (p. 150-167). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts in English and Chinese. / School code: 1307.

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