2014-08-012024-05-14https://scholars.lib.ntu.edu.tw/handle/123456789/658274摘要:背景: 胃癌目前仍是全球癌症死亡的前三大癌症,幽門桿菌目前已知是胃癌重要的致病因子。亞太地區,包括台灣、日本、中國及韓國是胃癌盛行率高的國家,但是在胃癌及幽門桿菌的研究仍欠缺一個跨國的研究團隊,而在下列許多議題之中,也亟待更多中心的參與,以期能為降低亞太地區胃癌發生率及死亡率訂定出適當的防治策略,包括 (1) 欠缺各國幽門桿菌最新盛行率資料,而致病毒性因子盛行率的差異是否是造成亞太各國胃癌發生率不同的因子目前也不清楚; (2) 各國的幽門桿菌抗藥性、盛行率不同,最適切的治療也不同; (3) 宿主基因在罹患幽門桿菌的角色依然不清楚。 研究目的 鑑於亞太地區胃癌及幽門桿菌的重要性,以及目前缺乏多國之研究團隊,我們聯合了日本、中國、馬來西亞、蒙古、印度、及台灣等國的學者,成立亞太幽門桿菌研究群,確立將執行以下三件臨床合作研究。 方法: 第一部分:亞太地區幽門桿菌盛行率及菌株致病因子之調查 1. 亞太幽門桿菌盛行率調查: 我們將使用 2011-13 年間,收案的血液檢體進行分析(共 3000人),將以血清學檢查檢測幽門桿菌。 2. 亞太幽門桿菌致病因子研究:我們將使用 2011-13 年間所收集到的菌株進行分析,共 500株,以評估盛行率。我們也將使用 2004 年至 2013 年間所收集的胃癌、胃潰瘍及十二指腸潰瘍及無前述疾病菌株各 150 株進行分析,以探討致病因子與疾病之相關性。我們將檢測Cag A, Cag A-EPIYA motif,Vac A ,dup A, Oip A 等致病因子。 第二部分:亞太各國幽門桿菌抗藥性之盛行率調查及各國根除率之變化 我們將利用台灣 2011 年至 2013 年間未接受過根除治療患者的菌株共 1500 株進行分析,將進行傳統 ager dilation test 及抗藥性基因檢測 第三部分:探討幽門桿菌感染的宿主基因因素 1. 為多國多中心的病例對照研究,台灣將收案 6000 人。 2. 幽門桿菌感染之檢測及感染者之定義:病理組織檢查、幽門桿菌培養、快速酶檢測、碳 13呼氣測試,及血清學檢查。五項檢查中至少 2 項以上陽性的人定義為有幽門桿菌感染,而所有檢查皆呈現陰性的人定義為無幽門桿菌感染。 3. 我們將使用 2000 年至 2013 年間所收集的周邊血液 DNA 及臨床資料進行分析。檢測之基因包括: Immunoregulatory genes, including the proinflammatory cytokine genes, Toll-like receptor genes, ATP4A,ATP4B, CA2, FUT2, PepC, PSCA, MUC1-6, FCGR2A 等基因。 預期成果: 透過這個亞太多個國家的幽門桿菌合作研究,可以讓我們瞭解幽門桿菌之致病因子是否是造成各國胃癌發生率不同的其中一個原因,也可以監測各國最近 3年來幽門桿菌抗藥性的盛行率以及根除成功率之近況。此外也可以探討及尋找亞洲族群罹患幽門桿菌感染的易感受性基因,以作為新藥及疫苗開發的立論依據。而這個平台建立之後,未來也有助於更多亞太胃腸疾病的合作研究。<br> Abstract: Background: Gastric cancer remains the leading cause of cancer related mortality worldwide. Helicobacter pylori (H. pylori) is an important causal factor of gastric cancer. The incidence of gastric cancer and the prevalence of H. pylori infection remain high in Asia-Pacific regions. However, a multi-countries study group on gastric cancer prevention and H. pylori is lacking in this region. There are several important issues need to be addressed to identify the optimal prevention strategies of gastric cancer, including (1) lack of updated epidemiological data on the prevalence of H. pylori infection, (2) the role of virulence factors of H. pylori in Asian Enigma, (3) the role of host genetic factors in the susceptibility of H. pylori infection, and (4) lack of updated prevalence of antibiotic resistance in this region. Objective: To establish Asian-Pacific Study Group on Gastric Cancer and Helicobacter and conduct three collaborative research in the epidemiology, pathogenesis, treatment, and prevention of H. pylori and gastric cancer. Methods: Part 1: Epidemiology of H. pylori and the role of its virulence factors in gastric carcinogenesis in Asia-Pacific regions: Serology test for H. pylori will be done using serum samples collected between 2011-2013 (N=3000 in Taiwan). Virulence factors (Cag A, Cag A-EPIYA motif, Vac A, dup A, Oip A) will be determined in 500 H. pylori strains collected in this periods and another 600 strains from patients with gastric cancer, gastric ulcer, duodenal ulcer, and gastritis alone between 2003-2013. Part 2: Prevalence of antibiotic resistance of H pylori and trends of eradication rates in Asia-Pacific regions: Agar dilution test and genotypic resistance will be determined in H. pylori strains (N=1500 in Taiwan) collected between 2011-2013. Part 3: Role of host genetic factors in the susceptibility of H. pylori infection: Genetic polymorphism of Immunoregulatory genes, including the proinflammatory cytokine genes, Toll-like receptor genes, ATP4A,ATP4B, CA2, FUT2, PepC, PSCA, MUC1-6, FCGR2A will be determined from 6000 patients with and without H. pylori infection. Expected Results: Through this collaborative research, we can assess whether the differences in the prevalence of virulence factor can explain the different incidence of gastric cancer in this region. We can survey the most recent prevalence of antibiotic resistance of H. pylori and their impact on eradication rates. We can also explore the role of genetic factors in the susceptibility of H. pylori infection which might help us to identify new treatment pathways of this infection.Investigation of Antibiotic Resistance, Virulence Factors, and Host Susceptibility Genes of Helicobacter pylori in Asia-Pacific Regions---A Multi-Countries Study