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Study of High Power ICRF Antenna Design in LHD

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Plasma Science and Technology 2010年第1期12卷 15-19页

作者： Hiroshi KASAHARA Tetsuo SEKI Kenji SAITO Ryuhei KUMAZAWA Takashi MUTOH Goro nomura Fujio SHIMPO shin KUBO Takashi SHIMOZUMA Yasuo YOSHIMURA Hiroe IGAMI Hiromi TAKAHASHI 赵燕平 Takuya OOSAKO Yuichi TAKASE National Institute for Fusion Science Institute of Plasma Physics Chinese Academy of Sciences University of Tokyo

In large helical device （LHD）, antenna loadings are different for minority ion cyclotron heating （MICH with 38.47 MHz） and mode-converted ion Bernstein wave heating （MC-IBW with 28.4 MHz）, and it is necessary to improve antenna loading with low heating efficiency to avoid arching on transmission line. To design a new ion cyclotron range of frequencies （ICRF） antenna in LHD, calculation for a simple antenna model is conducted using three-dimensional electrical magnetic code （high frequency structure simulator, HFSS） for an water loading as an imaginary plasma with low heating efficiency. At resonant frequencies, antenna loading is sensitive to strap width, and resonant frequencies are strongly related to strap height. There is no differences of RF current profile on the strap surface between resonant frequency and non-resonant frequency. The strap should be perpendicularly placed against the magnetic field line, since Faraday-shield angle will lead to a decrease in the effective antenna height.

关键词： ICRF minority heating mode conversion heating antenna design LHD

Gastric submucosa-invasive carcinoma associated with EpsteinBarr virus and endoscopic submucosal dissection: A case report

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World Journal of Gastrointestinal Oncology 2019年第10期11卷 925-932页

作者： Yu Kobayashi Takehito Kunogi Hiroki Tanabe Yuki Murakami Takuya Iwama Takahiro Sasaki Keitaro Takahashi Katsuyoshi Ando Yoshiki nomura Nobuhiro Ueno shin Kashima Kentaro Moriichi Hidehiro Takei Mikihiro Fujiya Toshikatsu Okumura Division of Gastroenterology and Hematology/Oncology Department of Medicine Asahikawa Medical UniversityAsahikawa 078-8510Japan Pathological Department of Asahikawa Medical University Hospital Asahikawa Medical UniversityAsahikawa 078-8510Japan

BACKGROUND Epstein-Barr virus(EBV)-associated carcinoma is a gastric cancer subtype with a morphology characterized by gastric carcinoma with lymphoid stroma(GCLS).Clinicopathological studies have indicated a better prognosis for GCLS than for common gastric *** previous cases of early gastric cancer associated with EBV had been diagnosed by endoscopic *** SUMMARY We present two GCLS cases subjected to endoscopic submucosal dissection(ESD)for a definitive diagnosis.A protruded gastric lesion was identified by routine endoscopic examination,but forceps biopsy showed no atypical cells before *** resected specimen showed a poorly differentiated adenocarcinoma with lymphoid cells involving the mucosa and *** final diagnosis was submucosa-invasive poorly differentiated gastric ***,additional gastrectomy was recommended to obtain a complete *** patient underwent additional distal gastrectomy with lymph node dissection,but the other was refused because of cardiovascular *** patients remained in remission for more than half a *** positivity was determined by EBV-encoded RNA in situ *** also conducted a literature review of cases of early gastric cancer associated with EBV that had been diagnosed by *** Submucosa-invasive GCLS could be dissected using ESD,and EBV positivity should be subsequently assessed to determine whether or not any additional curative surgery is *** prospective investigations on the prevalence of lymph node metastasis in EBV-associated carcinoma should be performed to expand the indications for endoscopic resection.

关键词： Herpesvirus 4 Human Stomach neoplasms Gastric carcinoma with lymphoid stroma Epstein-Barr virus-associated gastric carcinoma Case report

Pegylated interferon α-2b plus ribavirin for older patients with chronic hepatitis C

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World Journal of Gastroenterology 2010年第35期16卷 4400-4409页

作者： Mosaburo Kainuma Norihiro Furusyo Eiji Kajiwara Kazuhiro Takahashi Hideyuki nomura Yuichi Tanabe Takeaki Satoh Toshihiro Maruyama Makoto Nakamuta Kazuhiro Kotoh Koichi Azuma Junya Shimono shinji Shimoda Jun Hayashi Department of General Internal Medicine Kyushu University Hospital Department of Internal Medicine Nippon Steel Yawata Memorial Hospital Department of Medicine Hamanomachi Hospital The Center for Liver Disease Shin-Kokura Hospital Department of Medicine Fukuoka City HospitalYoshiduka-honmachi Center for Liver Disease National Hospital Organization Kokura Medical Center Department of Medicine Kitakyushu Municipal Medical Center Department of Gastroenterology Kyushu Medical CenterNational Hospital Organization Department of Medicine and Bioregulatory Science Graduate School of Medical ScienceKyushu University Department of Medicine and Clinical Science Graduate School of Medical SciencesKyushu University Saiseikai Yahata General Hospital Harunomachi Department of Medicine and Biosystemic Science Graduate School of Medical ScienceKyushu University

AIM:To analyze the efficacy and safety of a combination therapy of pegylated interferon(PEG-IFN) α-2b plus ribavirin(RBV) in older Japanese patients(65 years or older) infected with hepatitis C virus(HCV).METHODS:This multicenter study included 938 patients with HCV genotype 1 who received 1.5 μg/kg per week PEG-IFN α-2b plus RBV 600-1000 mg/d for 48 wk and 313 HCV genotype 2 patients who received this treatment for 24 ***:At 24 wk after the end of combination therapy,the overall sustained virological response(SVR) for genotypes 1 and 2 were 40.7% and 79.6%,*** SVR rate decreased signif icantly with age in each genotype,and was markedly reduced in genotype 1(P<0.001).Moreover,the SVR was significantly higher in patients with genotype 1 who were less than 65 years(47.3% of 685) than in those 65 years or older(22.9% of 253)(P<0.001) and was higher in patients with genotype 2 who were less than 65 years(82.9% of 252) than in those 65 years or older(65.6% of 61)(P=0.004).When patients received a dosage at least 80% or more of the target dosage of PEG-IFN α-2b and 60% or more of the target dosage of RBV,the SVR rate significantly increased to 66.5% in patients less than 65 years and to 45.2% in those 65 years or older(P<0.001).Adverse effects resulted in treatment discontinuation more often in patients with genotype 1(14.4%) than in patients with genotype 2(7.3%),especially by patients 65 years or older(24.1%).CONCLUSION:PEG-IFN α-2b plus RBV treatment was effective in chronic hepatitis C patients 65 years or older who completed treatment with at least the minimum acceptable treatment dosage.

关键词： Hepatitis C virus Gerontology Pegylated interferon Ribavirin

Efficacy and adverse events of cold vs hot polypectomy: A meta-analysis

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World Journal of Gastroenterology 2016年第23期22卷 5436-5444页

作者： Mikihiro Fujiya Hiroki Sato Nobuhiro Ueno Aki Sakatani Kazuyuki Tanaka Tatsuya Dokoshi Shugo Fujibayashi Yoshiki nomura shin Kashima Takuma Gotoh Junpei Sasajima Kentaro Moriichi Jiro Watari Yutaka Kohgo Division of Gastroenterology and Hematological Oncology Department of MedicineAsahikawa Medical University Hyogo College of Medicine Division of GastroenteroelogyDepartment of Internal Medicine

AIM: To compare previously reported randomized controlled studies(RCTs) of cold and hot polypectomy, we systematically reviewed and clarify the utility of cold polypectomy over hot with respect to efficacy and adverse ***: A meta-analysis was conducted to evaluate the predominance of cold and hot polypectomy for removing colon polyps. Published articles and abstracts from worldwide conferences were searched using the keywords "cold polypectomy". RCTs that compared either or both the effects or adverse events of cold polypectomy with those of hot polypectomy were collected. The patients' demographics, endoscopic procedures, No. of examined lesions, lesion size, macroscopic and histologic findings, rates of incomplete resection, bleeding amount, perforation, and length of procedure were extracted from each study. A forest plot analysis was used to verify the relative strength of the effects and adverse events of each procedure. A funnel plot was generated to assess the possibility of publication ***: Ultimately, six RCTs were selected. No significant differences were noted in the average lesion size(less than 10 mm) between the cold and hot polypectomy groups in each study. Further, the rates of complete resection and adverse events, including delayed bleeding, did not differ markedly between cold and hot polypectomy. The average procedural time in the cold polypectomy group was significantly shorter than in the hot polypectomy ***: Cold polypectomy is a time-saving procedure for removing small polyps with markedly similar curability and safety to hot polypectomy.

关键词： Cold polypectomy Hot polypectomy Colon adenoma Conventional polypectomy Colon neoplasm Endoscopic mu

Alpha-fetoprotein and des-gamma-carboxy-prothrombin at twenty-four weeks after interferon-based therapy predict hepatocellular carcinoma development

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World Journal of Hepatology 2015年第27期7卷 2757-2764页

作者： Satoshi Shakado Shotaro Sakisaka Kazuaki Chayama Takeshi Okanoue Joji Toyoda Namiki Izumi Akihiro Matsumoto Tetsuo Takehara Akio Ido Yoichi Hiasa Kentaro Yoshioka Hideyuki nomura Yoshiyuki Ueno Masataka Seike Hiromitsu Kumada Department of Gastro-enterology and Medicine Faculty of Medicine Fukuoka University Department of Gastroenterology and Metabolism Applied Life Sciences Graduate School of Biome-dical and Health SciencesHiroshima University Center of Gastroenterology and Hepatology Saiseikai Suita Hospital Department of Gastroenterology and Hepatology Sapporo Kousei Hospital Department of Gastroenterology and Hepatology Musashino Red-Cross Hospital Department of Medicine Shinshu University School of Medicine Department of Gastroenterology and Hepa-tology Osaka University Graduate School of Medicine Department of Gastroenterology and Hepatology Kagoshima University Department of Gastroenterology and Metabology Ehime University Graduate School of Medicine Department of Liver Biliary Tract and Pancreas Diseases Fujita Health University the Center for Liver Disease Shin-Kokura Hospital Department of Gastroenterology Yamagata University Department of Gastroenterology Faculty of Medicine Oita University Department of Hepatology Toranomon Hospital

AIM: To investigate risk factors for development of hepatocellular carcinoma(HCC) in patients with hepatitis C virus-related liver cirrhosis(LC-C).METHODS: To evaluate the relationship between clinical factors including virological response and the development of HCC in patients with LC-C treated with interferon(IFN) and ribavirin, we conducted a multicenter, retrospective study in 14 hospitals in Japan. All patients had compensated LC-C with clinical or histological data available. HCC was diagnosed by the presence of typical hypervascular characteristics on computed tomography and/or magnetic resonance ***: HCC was diagnosis in 50(21.6%) of 231 LC-C patients during a median observation period of 3.8 years after IFN and ribavirin therapy. Patients who developed HCC were older(P = 0.018) and had higher serum levels of pretreatment alpha-fetoprotein(AFP)(P = 0.038). Multivariate analysis revealed the following independent risk factors for HCC development: history of treatment for HCC [P < 0.001, odds ratio(OR) = 15.27, 95%CI: 4.98-59.51], AFP levels of ≥ 10 ng/m L(P = 0.009, OR = 3.89, 95%CI: 1.38-11.94), and des-γ-carboxy prothrombin(DCP) levels of ≥ 40 m AU/mL at 24 wk after the completion of IFN and ribavirin therapy(P < 0.001, OR = 24.43, 95%CI: 4.11-238.67).CONCLUSION: We suggested that the elevation of AFP and DCP levels at 24 wk after the completion of IFN and ribavirin therapy were strongly associated with the incidence of HCC irrespective of virological response among Japanese LC-C patients.

关键词： Des-γ-carboxy prothrombin Hepatocellular carcinoma

Importance of virological response in the early stage of telaprevir-based triple therapy for hepatitis C

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World Journal of Hepatology 2015年第26期7卷 2688-2695页

作者： Satoshi Hiramine Norihiro Furusyo Eiichi Ogawa Makoto Nakamuta Eiji Kajiwara Hideyuki nomura Kazufumi Dohmen Kazuhiro Takahashi Takeaki Satoh Koichi Azuma Akira Kawano Toshimasa Koyanagi Kazuhiro Kotoh shinji Shimoda Jun Hayashi Depart- ment of General Internal Medicine Kyushu University Hospital Department of Gastroenterology Kyushu Medical CenterNational Hospital Organization Department of Hepatology Steel Memorial Yahata Hospital the Center for Liver Disease Shin-Kokura Hospital Department of Internal Medicine Chihaya Hospital Department of Medicine Hamanomachi Hospital Center for Liver Disease National Hospital Organization Kokura Medical Center Department of Medicine Kyushu Central Hospital Department of Medicine Kitakyushu Municipal Medical Center Department of Medicine Fukuoka City Hospital Department of Medicine and Bioregulatory Science Graduate School of Medical Sciences Kyushu University Kyushu General Internal Medicine Center Hara- Doi Hospital

AIM: To investigate the efficacy of virological response(VR) to telaprevir(TVR)-based triple therapy in predicting treatment outcome of hepatitis ***: This prospective, multicenter study consisted of 253 Japanese patients infected with hepatitis C virus(HCV) genotype 1b. All received 12 wk of TVR in combination with 24 wk of pegylatedinterferon-α(IFN-α) and ribavirin. Serum HCV RNA was tested at weeks 1, 2, 3, 4, 6, 8, 12, 16, 20, and 24. VR was defined as undetectable serum HCV RNA. Sustained virological response(SVR) was VR at 24 wk after the end of treatment and was regarded as a successful ***: Of 253 patients, 207(81.8%) achieved SVR. The positive predictive value of VR for SVR was 100% at week 2, after which it gradually decreased, and was over 85% to week 12. The negative predictive value(NPV) gradually increased, reaching 100% at week 12. The upslope of the NPV showed a large increase from week 4(40.6%) to week 6(82.4%). There was a moderate concordance between the SVR and VR at week 6(kappa coefficient = 0.44), although other VRs had poor concordance to SVR. Multiple logistic regression analysis extracted VR at week 6(P < 0.0001, OR = 63.8) as an independent factor contributing to SVR. In addition, the interleukin-28 B single nucleotide polymorphism and response to previous pegylated-IFN-α and ribavirin therapy were identified as independent factors for ***: VR at week 6, but not at week 4, is an efficient predictor of both SVR and non-SVR to TVRbased triple therapy.

关键词： Chronic hepatitis C Direct-acting antiviral agent