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Author Yasuharu Imai

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Prediction model for hepatocellular carcinoma occurrence in patients with hepatitis C in the era of direct-acting anti-virals.

Yuki Tahata, Ryotaro Sakamori, Ryoko Yamada, Takahiro Kodama, Hayato Hikita, Hideki Hagiwara, Yasuharu Imai, Naoki Hiramatsu, Shinji Tamura, Keiji Yamamoto, Masahide Oshita, Kazuyoshi Ohkawa, Taizo Hijioka, Hiroyuki Fukui, Toshifumi Ito, Yoshinori Doi, Yukinori Yamada, Takayuki Yakushijin, Yuichi Yoshida, Tomohide Tatsumi, Tetsuo Takehara, ,

<h4>Background</h4>Several factors associated with hepatocellular carcinoma (HCC) occurrence after sustained virological response (SVR) in patients with hepatitis C have been reported. However, few validation studies have been performed in the era of direct-acting anti-virals (DAAs).<h4>Aims</h4>To develop a prediction model for HCC occurrence after DAA-mediated SVR and validate its usefulness.<h4>Methods</h4>We analysed ... Read more >>

Aliment Pharmacol Ther (Alimentary pharmacology & therapeutics)
[2021, :]

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Clinical outcomes of direct-acting antiviral treatments for patients with hepatitis C after hepatocellular carcinoma are equivalent to interferon treatment.

Yuki Tahata, Ryotaro Sakamori, Ayako Urabe, Ryoko Yamada, Kazuyoshi Ohkawa, Naoki Hiramatsu, Hideki Hagiwara, Masahide Oshita, Yasuharu Imai, Takahiro Kodama, Hayato Hikita, Tomohide Tatsumi, Tetsuo Takehara,

<h4>Aim</h4>It remains unclear how direct-acting antiviral (DAA) treatments influence hepatocellular carcinoma (HCC) recurrence and survival in comparison with interferon (IFN).<h4>Methods</h4>In total, 338 patients with chronic hepatitis C virus (HCV) infection and previous HCC treatments who initiated IFN (N = 88, IFN group) or DAA treatment (N = 250, DAA group) from January 2005 to ... Read more >>

Hepatol Res (Hepatology research : the official journal of the Japan Society of Hepatology)
[2020, 50(10):1118-1127]

Cited: 1 time

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Initial treatment response to transarterial chemoembolization as a predictive factor for Child-Pugh class deterioration prior to refractoriness in hepatocellular carcinoma.

Kazuki Maesaka, Ryotaro Sakamori, Ryoko Yamada, Yuki Tahata, Yasuharu Imai, Masahide Oshita, Kazuyoshi Ohkawa, Takahiro Kodama, Hayato Hikita, Tomohide Tatsumi, Tetsuo Takehara,

AIM:Repeated transarterial chemoembolization (TACE) for intermediate-stage hepatocellular carcinoma (HCC) eventually leads to either deteriorated hepatic reserve or TACE refractoriness. Switching to molecular targeted agents after TACE requires preservation of hepatic reserve. This study aimed to investigate the predictive factors associated with early deterioration of hepatic reserve by repeated TACE prior ... Read more >>

Hepatol Res (Hepatology research : the official journal of the Japan Society of Hepatology)
[2020, 50(11):1275-1283]

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Primary adenosquamous carcinoma of the liver detected during cancer surveillance in a patient with primary sclerosing cholangitis.

Kazuma Daiku, Kazuto Fukuda, Osakuni Morimoto, Daisuke Takiuchi, Hiromi Shimakoshi, Tadashi Kegasawa, Yoshitaka Yamaguchi, Sachiyo Kogita, Yoshiyuki Sawai, Masanori Nakahara, Takumi Igura, Kunitaka Shibata, Yasuharu Imai,

Primary sclerosing cholangitis (PSC) is associated with significant risk for hepatobiliary cancers. Primary hepatic adenosquamous carcinoma (ASC), a rare subtype of cholangiocarcinoma, is composed of both adenocarcinoma and squamous cell carcinoma components. We herein report the case of a patient with PSC who was diagnosed with ASC of the liver ... Read more >>

Clin J Gastroenterol (Clinical journal of gastroenterology)
[2020, 13(6):1273-1279]

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Lower Serum Sodium Levels Are Associated with the Therapeutic Effect of Sorafenib on Hepatocellular Carcinoma.

Tadashi Kegasawa, Ryotaro Sakamori, Kazuki Maesaka, Ryoko Yamada, Yuki Tahata, Ayako Urabe, Takahiro Kodama, Hayato Hikita, Kazuho Imanaka, Kazuyoshi Ohkawa, Naoki Hiramatsu, Masahide Oshita, Yukinori Yamada, Masami Inada, Takayuki Yakushijin, Yasuharu Imai, Tomohide Tatsumi, Tetsuo Takehara,

<h4>Background and aim</h4>Although the serum sodium level has been reported to be a prognostic and predictive marker for the therapeutic effects of lung cancer and renal cell carcinoma treated with molecular targeted therapy, the serum sodium level has not been investigated in hepatocellular carcinoma (HCC) patients treated with sorafenib. The ... Read more >>

Dig Dis Sci (Digestive diseases and sciences)
[2021, 66(5):1720-1729]

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Pre-existing minor variants with NS5A L31M/V-Y93H double substitution are closely linked to virologic failure with asunaprevir plus daclatasvir treatment for genotype 1b hepatitis C virus infection.

Naoki Morishita, Ryotaro Sakamori, Tomomi Yamada, Yugo Kai, Yuki Tahata, Ayako Urabe, Ryoko Yamada, Takahiro Kodama, Hayato Hikita, Yoshinori Doi, Shinji Tamura, Hideki Hagiwara, Yasuharu Imai, Sadaharu Iio, Tomohide Tatsumi, Tetsuo Takehara,

<h4>Background</h4>L31 and Y93 in the NS5A region of the hepatitis C virus (HCV) are the most important substitution positions associated with resistance to direct-acting antiviral (DAA) treatment.<h4>Methods</h4>We analyzed the frequency of NS5A L31M/V and Y93/H in NS5A inhibitor-naive HCV genotype 1 patients who received asunaprevir plus daclatasvir combination treatment using ... Read more >>

PLoS One (PloS one)
[2020, 15(6):e0234811]

Cited: 0 times

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Underwater EMR of a colonic adenoma surrounded by diverticula.

Satoki Shichijo, Yoshitaka Yamaguchi, Masanori Nakahara, Yasuharu Imai, Ryu Ishihara,

VideoGIE (VideoGIE : an official video journal of the American Society for Gastrointestinal Endoscopy)
[2020, 5(4):157-158]

Cited: 2 times

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Hepatocellular carcinoma occurrence does not differ between interferon-based and interferon-free treatment with liver histological assessment.

Yuki Tahata, Ryotaro Sakamori, Ayako Urabe, Ryoko Yamada, Kazuyoshi Ohkawa, Naoki Hiramatsu, Hideki Hagiwara, Masahide Oshita, Taizo Hijioka, Shinji Tamura, Yasuharu Imai, Takahiro Kodama, Hayato Hikita, Tomohide Tatsumi, Tetsuo Takehara,

<h4>Aim</h4>Several studies have recently reported that hepatocellular carcinoma (HCC) occurrence does not differ between hepatitis C virus patients receiving interferon (IFN)-based and IFN-free treatments considering the patients' backgrounds. However, liver fibrosis was not directly considered in these studies.<h4>Methods</h4>In total, 3972 patients without a history of HCC who started IFN-based or IFN-free ... Read more >>

Hepatol Res (Hepatology research : the official journal of the Japan Society of Hepatology)
[2020, 50(3):313-320]

Cited: 0 times

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Objective Response by mRECIST Is an Independent Prognostic Factor for Overall Survival in Hepatocellular Carcinoma Treated with Sorafenib in the SILIUS Trial.

Masatoshi Kudo, Kazuomi Ueshima, Yasutaka Chiba, Sadahisa Ogasawara, Shuntaro Obi, Namiki Izumi, Hiroshi Aikata, Hiroaki Nagano, Etsuro Hatano, Yutaka Sasaki, Keisuke Hino, Takashi Kumada, Kazuhide Yamamoto, Yasuharu Imai, Shouta Iwadou, Chikara Ogawa, Takuji Okusaka, Fumihiko Kanai, Yasuaki Arai,

Objective:In SILIUS (NCT01214343), combination of sorafenib and hepatic arterial infusion chemotherapy did not significantly improve overall survival (OS) in patients with advanced hepatocellular carcinoma (HCC) compared with sorafenib alone. In this study, we explored the relationship between objective response by mRECIST and OS in the sorafenib group, in the combination ... Read more >>

Liver Cancer (Liver cancer)
[2019, 8(6):505-519]

Cited: 3 times

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Liver shape analysis using partial least squares regression-based statistical shape model: application for understanding and staging of liver fibrosis.

Mazen Soufi, Yoshito Otake, Masatoshi Hori, Kazuya Moriguchi, Yasuharu Imai, Yoshiyuki Sawai, Takashi Ota, Noriyuki Tomiyama, Yoshinobu Sato,

PURPOSE:Liver shape variations have been considered as feasible indicators of liver fibrosis. However, current statistical shape models (SSM) based on principal component analysis represent gross shape variations without considering the association with the fibrosis stage. Therefore, we aimed at the application of a statistical shape modelling approach using partial least ... Read more >>

Int J Comput Assist Radiol Surg (International journal of computer assisted radiology and surgery)
[2019, 14(12):2083-2093]

Cited: 0 times

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Objective Response by mRECIST is an Independent Prognostic Factor for overall Survival in Hepatocellular Carcinoma in SILIUS Trial

Masatoshi Kudo, Kazuomi Ueshima, Yasutaka Chiba, Sadahisa Ogasawara, Shuntaro Obi, Namiki Izumi, Hiroshi Aikata, Hiroaki Nagano, Etsuro Hatano, Yutaka Sasaki, Keisuke Hino, Takashi Kumada, Kazuhide Yamamoto, Yasuharu Imai, Shouta Iwadou, Chikara Ogawa, Takuji Okusaka, Fumihiko Kanai, Yasuaki Arai,

<h4>Background: </h4> In SILIUS (NCT01214343), combination of sorafenib and hepatic arterial infusion chemotherapy did not significantly improve overall survival in patients with advanced hepatocellular carcinoma (HCC) compared with sorafenib alone. In this study, we explored the relationship between objective response by mRECIST and overall survival (OS) in the sorafenib group, ... Read more >>

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B-Mode Ultrasonography versus Contrast-Enhanced Ultrasonography for Surveillance of Hepatocellular Carcinoma: A Prospective Multicenter Randomized Controlled Trial.

Masatoshi Kudo, Kazuomi Ueshima, Yukio Osaki, Masashi Hirooka, Yasuharu Imai, Kazunobu Aso, Kazushi Numata, Masayuki Kitano, Takashi Kumada, Namiki Izumi, Yasukiyo Sumino, Chikara Ogawa, Kohei Akazawa,

<h4>Background</h4>Current practice guidelines recommend the use of ultrasound (US) as an initial surveillance tool for hepatocellular carcinoma (HCC) in patients with liver cirrhosis. Patients with liver cirrhosis, however, frequently have coarse liver parenchyma, masking the presence of tiny nodules during B-mode US. Contrast-enhanced US (CEUS) with Sonazoid has a long-lasting, ... Read more >>

Liver Cancer (Liver cancer)
[2019, 8(4):271-280]

Cited: 15 times

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Predictive factors of anemia during sofosbuvir and ribavirin therapy for genotype 2 chronic hepatitis C patients.

Ayako Urabe, Ryotaro Sakamori, Yuki Tahata, Ryoko Yamada, Yasuharu Imai, Hideki Hagiwara, Shinji Tamura, Hiroyuki Fukui, Yukinori Yamada, Akira Kaneko, Taizo Hijioka, Takahiro Kodama, Hayato Hikita, Tomohide Tatsumi, Tetsuo Takehara,

<h4>Aim</h4>Sofosbuvir (SOF) and ribavirin (RBV) combination therapy has improved the sustained virologic response (SVR) rate and shortened the treatment duration for patients with chronic hepatitis C virus (HCV) genotype 2 infection. Ribavirin-induced hemolytic anemia is one of the most troublesome side-effects of SOF/RBV therapy; however, factors associated with this condition ... Read more >>

Hepatol Res (Hepatology research : the official journal of the Japan Society of Hepatology)
[2019, 49(8):853-859]

Cited: 0 times

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Incidence and risk factors of hepatocellular carcinoma change over time in patients with hepatitis C virus infection who achieved sustained virologic response.

Ryoko Yamada, Naoki Hiramatsu, Tsugiko Oze, Ayako Urabe, Yuki Tahata, Naoki Morishita, Takahiro Kodama, Hayato Hikita, Ryotaro Sakamori, Takayuki Yakushijin, Akira Yamada, Hideki Hagiwara, Eiji Mita, Masahide Oshita, Toshifumi Itoh, Hiroyuki Fukui, Yoshiaki Inui, Taizo Hijioka, Masami Inada, Kazuhiro Katayama, Shinji Tamura, Atsuo Inoue, Yasuharu Imai, Tomohide Tatsumi, Toshimitsu Hamasaki, Norio Hayashi, Tetsuo Takehara,

<h4>Aim</h4>In patients with chronic hepatitis C, hepatocellular carcinoma (HCC) occurs at a certain frequency, even if a sustained virologic response (SVR) is achieved by antiviral treatment. Old age, liver fibrosis, and high post-treatment α-fetoprotein (AFP) level are typical risk factors of post-SVR HCC. We examined whether the frequencies and factors ... Read more >>

Hepatol Res (Hepatology research : the official journal of the Japan Society of Hepatology)
[2019, 49(5):570-578]

Cited: 7 times

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Efficacy and Safety of Deep Sedation in Percutaneous Radiofrequency Ablation for Hepatocellular Carcinoma.

Koki Sato, Nobuhito Taniki, Ryo Kanazawa, Motonori Shimizu, Shigeto Ishii, Hideko Ohama, Masashi Takawa, Hiroaki Nagamatsu, Yasuharu Imai, Shuichiro Shiina,

<h4>Introduction</h4>Radiofrequency ablation (RFA) has been accepted as safe and effective for treating early-stage hepatocellular carcinoma (HCC). However, it often causes severe pain. Therefore, in this study, we performed RFA under deep sedation and investigated its efficacy and safety.<h4>Methods</h4>We conducted a retrospective study including 511 HCC patients who received approximately 886 ... Read more >>

Adv Ther (Advances in therapy)
[2019, 36(2):344-354]

Cited: 1 time

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Percutaneous Ablation for Hepatocellular Carcinoma: Comparison of Various Ablation Techniques and Surgery.

Shuichiro Shiina, Koki Sato, Ryosuke Tateishi, Motonori Shimizu, Hideko Ohama, Takeshi Hatanaka, Masashi Takawa, Hiroaki Nagamatsu, Yasuharu Imai,

Image-guided percutaneous ablation is considered best in the treatment of early-stage hepatocellular carcinoma (HCC). Ablation is potentially curative, minimally invasive, and easily repeatable for recurrence. Ethanol injection used to be the standard in ablation. However, radiofrequency ablation has recently been the most prevailing ablation method for HCC. Many investigators have ... Read more >>

Can J Gastroenterol Hepatol (Canadian journal of gastroenterology & hepatology)
[2018, 2018:4756147]

Cited: 18 times

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Nonstructural protein 5A/P32 deletion after failure of ledipasvir/sofosbuvir in hepatitis C virus genotype 1b infection.

Akira Doi, Hayato Hikita, Ryotaro Sakamori, Yuki Tahata, Yugo Kai, Ryoko Yamada, Takayuki Yakushijin, Eiji Mita, Kazuyoshi Ohkawa, Yasuharu Imai, Kunimaro Furuta, Takahiro Kodama, Tomohide Tatsumi, Tetsuo Takehara,

Hepatology (Hepatology (Baltimore, Md.))
[2018, 68(1):380-383]

Cited: 7 times

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Sorafenib plus low-dose cisplatin and fluorouracil hepatic arterial infusion chemotherapy versus sorafenib alone in patients with advanced hepatocellular carcinoma (SILIUS): a randomised, open label, phase 3 trial.

Masatoshi Kudo, Kazuomi Ueshima, Osamu Yokosuka, Sadahisa Ogasawara, Shuntaro Obi, Namiki Izumi, Hiroshi Aikata, Hiroaki Nagano, Etsuro Hatano, Yutaka Sasaki, Keisuke Hino, Takashi Kumada, Kazuhide Yamamoto, Yasuharu Imai, Shouta Iwadou, Chikara Ogawa, Takuji Okusaka, Fumihiko Kanai, Kohei Akazawa, Ken-Ichi Yoshimura, Philip Johnson, Yasuaki Arai, ,

<h4>Background</h4>Hepatic arterial infusion chemotherapy plus sorafenib in phase 2 trials has shown favourable tumour control and a manageable safety profile in patients with advanced, unresectable hepatocellular carcinoma. However, no randomised phase 3 trial has tested the combination of sorafenib with continuous arterial infusion chemotherapy. We aimed to compare continuous hepatic ... Read more >>

Lancet Gastroenterol Hepatol (The lancet. Gastroenterology & hepatology)
[2018, 3(6):424-432]

Cited: 52 times

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The state of ultrasound technology in the diagnosis and treatment of liver diseases now and in the future.

Yasuharu Imai,

J Med Ultrason (2001) (Journal of medical ultrasonics (2001))
[2018, 45(2):199-203]

Cited: 0 times

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Prospective Comparison of Gd-EOB-DTPA-Enhanced MRI with Dynamic CT for Detecting Recurrence of HCC after Radiofrequency Ablation.

Yasuharu Imai, Kazuhiro Katayama, Masatoshi Hori, Takayuki Yakushijin, Kenji Fujimoto, Toshifumi Itoh, Takumi Igura, Mitsuru Sakakibara, Manabu Takamura, Masakatsu Tsurusaki, Hiroto Takahashi, Katsuyuki Nakanishi, Noriaki Usuki, Koh Tsuji, Hiroshi Ohashi, Tonsok Kim, Tetsuo Takehara, Takamichi Murakami,

Background:We prospectively compared the efficacy of gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid (Gd-EOB-DTPA)-enhanced magnetic resonance imaging (MRI) with that of dynamic multidetector computed tomography (MDCT) for detection of recurrent hypervascular hepatocellular carcinoma (HCC) after radiofrequency ablation (RFA). Methods:Institutional review board approval and written informed consent were obtained for this multicenter study. Ninety-seven HCC ... Read more >>

Liver Cancer (Liver cancer)
[2017, 6(4):349-359]

Cited: 9 times

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Non-Hypervascular Hypointense Hepatic Nodules during the Hepatobiliary Phase of Gadolinium-Ethoxybenzyl-Diethylenetriamine Pentaacetic Acid-Enhanced MRI as a Risk Factor of Intrahepatic Distant Recurrence after Radiofrequency Ablation of Hepatocellular Carcinoma.

Takayuki Iwamoto, Yasuharu Imai, Takumi Igura, Sachiyo Kogita, Yoshiyuki Sawai, Kazuto Fukuda, Yoshitaka Yamaguchi, Yasushi Matsumoto, Masanori Nakahara, Osakuni Morimoto, Hiroshi Ohashi, Norihiko Fujita, Masatoshi Kudo, Tetsuo Takehara,

<h4>Background</h4>Non-hypervascular hypointense hepatic nodules during the hepatobiliary phase of gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid (Gd-EOB-DTPA)-enhanced MRI have been reported to be associated with intrahepatic distant recurrence (IDR) after hepatectomy or radiofrequency ablation (RFA) for hepatocellular carcinoma (HCC). IDR is categorized into hypervascular transformation of non-hypervascular hypointense hepatic nodules and new intrahepatic recurrence. ... Read more >>

Dig Dis (Digestive diseases (Basel, Switzerland))
[2017, 35(6):574-582]

Cited: 1 time

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Cost-effectiveness of EOB-MRI for Hepatocellular Carcinoma in Japan.

Akihiro Nishie, Satoshi Goshima, Hiroki Haradome, Etsuro Hatano, Yasuharu Imai, Masatoshi Kudo, Masanori Matsuda, Utaroh Motosugi, Satoshi Saitoh, Kengo Yoshimitsu, Bruce Crawford, Eliza Kruger, Graeme Ball, Hiroshi Honda,

<h4>Purpose</h4>The objective of the study was to evaluate the cost-effectiveness of gadoxetic acid-enhanced magnetic resonance imaging (EOB-MRI) in the diagnosis and treatment of hepatocellular carcinoma (HCC) in Japan compared with extracellular contrast media-enhanced MRI (ECCM-MRI) and contrast media-enhanced computed tomography (CE-CT) scanning.<h4>Methods</h4>A 6-stage Markov model was developed to estimate lifetime ... Read more >>

Clin Ther (Clinical therapeutics)
[2017, 39(4):738-750.e4]

Cited: 4 times

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Baseline quasispecies selection and novel mutations contribute to emerging resistance-associated substitutions in hepatitis C virus after direct-acting antiviral treatment.

Yugo Kai, Hayato Hikita, Naoki Morishita, Kazuhiro Murai, Tasuku Nakabori, Sadaharu Iio, Hideki Hagiwara, Yasuharu Imai, Shinji Tamura, Syusaku Tsutsui, Masafumi Naito, Meiko Nishiuchi, Yasuteru Kondo, Takanobu Kato, Hiroshi Suemizu, Ryoko Yamada, Tsugiko Oze, Takayuki Yakushijin, Naoki Hiramatsu, Ryotaro Sakamori, Tomohide Tatsumi, Tetsuo Takehara,

Resistance-associated substitutions (RASs) in hepatitis C virus (HCV) appear upon failure of treatment with direct-acting antivirals (DAAs). However, their origin has not been clarified in detail. Among 11 HCV genotype 1b patients who experienced virologic failure with asunaprevir (ASV)/daclatasvir (DCV), 10 had major NS5A L31M/V-Y93H variants after treatment. L31M/V-Y93H variants ... Read more >>

Sci Rep (Scientific reports)
[2017, 7:41660]

Cited: 12 times

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Ultra-deep sequencing analysis of resistance-associated variants during retreatment with simeprevir-based triple therapy after failure of telaprevir-based triple therapy in patients with genotype 1 hepatitis C virus infection.

Naoki Morishita, Naoki Hiramatsu, Tsugiko Oze, Ayako Urabe, Yuki Tahata, Ryoko Yamada, Takayuki Yakushijin, Atsushi Hosui, Sadaharu Iio, Akira Yamada, Hideki Hagiwara, Eiji Mita, Yukinori Yamada, Toshifumi Ito, Masami Inada, Kazuhiro Katayama, Iwao Yabuuchi, Yasuharu Imai, Hayato Hikita, Ryotaro Sakamori, Yuichi Yoshida, Tomohide Tatsumi, Norio Hayashi, Tetsuo Takehara,

<h4>Aim</h4>Simeprevir (SMV)-based triple therapy is an effective retreatment option following failure of telaprevir (TVR)-based triple therapy. However, it is unclear whether the persistence of resistance-associated variants (RAVs) induced by TVR-based therapy may reduce the treatment effect of SMV-based therapy.<h4>Methods</h4>The factors associated with the treatment effect, including RAVs in the NS3 ... Read more >>

Hepatol Res (Hepatology research : the official journal of the Japan Society of Hepatology)
[2017, 47(8):773-782]

Cited: 2 times

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Comparison of Contrast-Enhanced Ultrasound and Gadolinium-Ethoxybenzyl-Diethylenetriamine Pentaacetic Acid-Enhanced MRI for the Diagnosis of Macroscopic Type of Hepatocellular Carcinoma.

Takayuki Iwamoto, Yasuharu Imai, Sachiyo Kogita, Takumi Igura, Yoshiyuki Sawai, Kazuto Fukuda, Yoshitaka Yamaguchi, Yasushi Matsumoto, Masanori Nakahara, Osakuni Morimoto, Yasushi Seki, Hiroshi Ohashi, Norihiko Fujita, Masatoshi Kudo, Tetsuo Takehara,

<h4>Objective</h4>We compared the efficacy of contrast-enhanced ultrasound sonography (CEUS) with sonazoid and gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid (Gd-EOB-DTPA)-enhanced MRI for the assessment of macroscopic classification of nodular hepatocellular carcinoma (HCC).<h4>Methods</h4>Seventy-seven consecutive patients with 79 surgically resected HCCs who underwent both preoperative CEUS and Gd-EOB-DTPA-enhanced MRI were enrolled in this retrospective study. Based ... Read more >>

Dig Dis (Digestive diseases (Basel, Switzerland))
[2016, 34(6):679-686]

Cited: 7 times

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