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Hiroaki Okamoto

Active 1975–2025

222
Papers
35,308
Citations
103
h-index
213
i10-index

Citations

Citations per year for Hiroaki Okamoto1975: 1 citations1976: 1 citations1977: 2 citations1978: 4 citations1979: 2 citations1980: 3 citations1981: 1 citations1982: 1 citations1984: 1 citations1986: 2 citations1987: 6 citations1988: 7 citations1989: 8 citations1990: 21 citations1991: 74 citations1992: 136 citations1993: 142 citations1994: 285 citations1995: 237 citations1996: 214 citations1997: 259 citations1998: 183 citations1999: 294 citations2000: 249 citations2001: 219 citations2002: 175 citations2003: 170 citations2004: 209 citations2005: 218 citations2006: 172 citations2007: 224 citations2008: 226 citations2009: 169 citations2010: 167 citations2011: 191 citations2012: 135 citations2013: 168 citations2014: 141 citations2015: 96 citations2016: 145 citations2017: 133 citations2018: 76 citations2019: 464 citations2020: 511 citations2021: 536 citations2022: 325 citations2023: 236 citations2024: 559 citations2025: 186 citations2026: 3 citations1983: no citations, so this year is not shown1985: no citations, so this year is not shown

Citation sources

Countries

World map of the countries and regions citing this authorUnited States: 1,295 citing papers, 20.3% of this breakdownJapan: 776 citing papers, 12.2% of this breakdownChina: 459 citing papers, 7.2% of this breakdownFrance: 396 citing papers, 6.2% of this breakdownGermany: 367 citing papers, 5.8% of this breakdownUnited Kingdom: 354 citing papers, 5.5% of this breakdownItaly: 334 citing papers, 5.2% of this breakdownSpain: 174 citing papers, 2.7% of this breakdownNetherlands: 150 citing papers, 2.4% of this breakdownIndia: 129 citing papers, 2% of this breakdownCanada: 123 citing papers, 1.9% of this breakdownTaiwan: 120 citing papers, 1.9% of this breakdown
0%20.3%Other 26.7%

Institutions

Fields

  • Medicine81.5%
  • Biochemistry, Genetics and Molecular Biology6.3%
  • Agricultural and Biological Sciences6.1%
  • Immunology and Microbiology2.8%
  • Dentistry0.9%
  • Environmental Science0.6%
  • Other1.8%

Topics

  • Hepatitis C virus research13.7%
  • Hepatitis B Virus Studies11.5%
  • Hepatitis Viruses Studies and Epidemiology8.4%
  • Viral gastroenteritis research and epidemiology6.5%
  • Liver Disease Diagnosis and Treatment5.7%
  • Liver Disease and Transplantation3.6%
  • Other50.6%

Coauthors

All papers

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  1. ICTV Virus Taxonomy Profile: Hepeviridae 2022

    Authors: Michael A. Purdy, Jan Felix Drexler, Xiang‐Jin Meng, Heléne Norder, Hiroaki Okamoto, Wim H. M. van der Poel, Gábor Reuter, William Marciel de Souza, Rainer G. Ulrich, Donald B. Smith - Journal of General Virology 2022 cited by 312

  2. Update: proposed reference sequences for subtypes of hepatitis E virus (species Orthohepevirus A)

    Authors: Donald B. Smith, Jacques Izopet, Florence Nicot, Peter Simmonds, Shahid Jameel, Xiang‐Jin Meng, Heléne Norder, Hiroaki Okamoto, Wim H. M. van der Poel, Gábor Reuter, Michael A. Purdy - Journal of General Virology 2020 cited by 367

  3. Carboplatin- or Cisplatin-Based Chemotherapy in First-Line Treatment of Small-Cell Lung Cancer: The COCIS Meta-Analysis of Individual Patient Data

    Authors: Antônio Rossi, Massimo Di Maïo, Paolo Chiodini, Robin Rudd, Hiroaki Okamoto, Dimosthenis Skarlos, Martin Früh, Wendi Qian, Tomohide Tamura, E. Samantas, Taro Shibata, Francesco Perrone, Ciro Gallo, Cesare Gridelli, Olga Martelli, Siow Ming Lee - Journal of Clinical Oncology 2012 cited by 565

  4. Hepatitis E virus egress depends on the exosomal pathway, with secretory exosomes derived from multivesicular bodies

    Authors: Shigeo Nagashima, Suljid Jirintai, Masaharu Takahashi, Tominari Kobayashi, Tanggis, Tsutomu Nishizawa, Tom Kouki, Takashi Yashiro, Hiroaki Okamoto - Journal of General Virology 2014 cited by 211

  5. Characterization of the Quasi-Enveloped Hepatitis E Virus Particles Released by the Cellular Exosomal Pathway

    Authors: Shigeo Nagashima, Masaharu Takahashi, Tominari Kobayashi, Tanggis, Tsutomu Nishizawa, Takashi Nishiyama, Putu Prathiwi Primadharsini, Hiroaki Okamoto - Journal of Virology 2017 cited by 214

  6. A Novel DNA Virus (TTV) Associated with Elevated Transaminase Levels in Posttransfusion Hepatitis of Unknown Etiology

    Authors: Tsutomu Nishizawa, Hiroaki Okamoto, Keiko Konishi, Hiroshi Yoshizawa, Yuzo Miyakawa, Makoto Mayumi - Biochemical and Biophysical Research Communications 1997 cited by 1,242

  7. Taxonomic update for mammalian anelloviruses (family Anelloviridae)

    Authors: Arvind Varsani, Tanja Opriessnig, V. Celer, Fabrizio Maggi, Hiroaki Okamoto, Anne-Lie Blomström, Dániel Cadar, Balázs Harrach, Philippe Biagini, Simona Kraberger - Archives of Virology 2021 cited by 104

  8. ORF3 protein of hepatitis E virus is essential for virion release from infected cells

    Authors: Kentaro Yamada, Masaharu Takahashi, Yu Hoshino, Hideyuki Takahashi, Koji Ichiyama, Shigeo Nagashima, Toshinori Tanaka, Hiroaki Okamoto - Journal of General Virology 2009 cited by 236

  9. Inverse relationship between the titre of TT virus DNA and the CD4 cell count in patients infected with HIV

    Authors: Takao Shibayama, Gohta MASUDA, Atsushi Ajisawa, Masaharu Takahashi, Tsutomu Nishizawa, Fumio Tsuda, Hiroaki Okamoto - AIDS 2001 cited by 132

  10. Hepatitis E Virus (HEV) Strains in Serum Samples Can Replicate Efficiently in Cultured Cells Despite the Coexistence of HEV Antibodies: Characterization of HEV Virions in Blood Circulation

    Authors: Masaharu Takahashi, Toshinori Tanaka, Hideyuki Takahashi, Yu Hoshino, Shigeo Nagashima, Jirintai, Hitoshi Mizuo, Yasuyuki Yazaki, Tomofumi Takagi, Masahiro Azuma, Eiji Kusano, Norio Isoda, Kentaro Sugano, Hiroaki Okamoto - Journal of Clinical Microbiology 2010 cited by 277

  11. Randomized Phase III Study of Pemetrexed Plus Cisplatin Versus Vinorelbine Plus Cisplatin for Completely Resected Stage II to IIIA Nonsquamous Non–Small-Cell Lung Cancer

    Authors: Hirotsugu Kenmotsu, Nobuyuki Yamamoto, Takeharu Yamanaka, Katsuo Yoshiya, Toshiaki Takahashi, Tsuyoshi Ueno, Kōichi Goto, Haruko Daga, Norihiko Ikeda, Kenji Sugio, Takashi Seto, Shinichi Toyooka, Hiroshi Date, Tetsuya Mitsudomi, Isamu Okamoto, Kohei Yokoi, Hideo Saka, Hiroaki Okamoto, Yuichi Takiguchi, Masahiro Tsuboi - Journal of Clinical Oncology 2020 cited by 114

  12. A Phase 2 Study of Atezolizumab for Pretreated NSCLC With Idiopathic Interstitial Pneumonitis

    Authors: Satoshi Ikeda, Terufumi Kato, Hirotsugu Kenmotsu, Takashi Ogura, Shunichiro Iwasawa, Yuki Sato, Toshiyuki Harada, Kaoru Kubota, Takaaki Tokito, Isamu Okamoto, Naoki Furuya, Toshihide Yokoyama, Shinobu Hosokawa, Tae Iwasawa, Takeharu Yamanaka, Hiroaki Okamoto - Journal of Thoracic Oncology 2020 cited by 103

  13. Anelloviridae taxonomy update 2023

    Authors: Arvind Varsani, Simona Kraberger, Tanja Opriessnig, Fabrizio Maggi, V. Celer, Hiroaki Okamoto, Philippe Biagini - Archives of Virology 2023 cited by 43

  14. Monoclonal antibodies raised against the ORF3 protein of hepatitis E virus (HEV) can capture HEV particles in culture supernatant and serum but not those in feces

    Authors: Masaharu Takahashi, Kentaro Yamada, Yu Hoshino, Hideyuki Takahashi, Koji Ichiyama, Toshinori Tanaka, Hiroaki Okamoto - Archives of Virology 2008 cited by 165

  15. Tumour susceptibility gene 101 and the vacuolar protein sorting pathway are required for the release of hepatitis E virions

    Authors: Shigeo Nagashima, Masaharu Takahashi, Suljid Jirintai, Toshinori Tanaka, Tsutomu Nishizawa, Jiro Yasuda, Hiroaki Okamoto - Journal of General Virology 2011 cited by 118

  16. Comparison of platinum combination chemotherapy plus pembrolizumab versus platinum combination chemotherapy plus nivolumab–ipilimumab for treatment-naive advanced non-small-cell lung cancer in Japan (JCOG2007): an open-label, multicentre, randomised, phase 3 trial

    Authors: Yoshimasa Shiraishi, Shogo Nomura, Shunichi Sugawara, Hidehito Horinouchi, Yasuto Yoneshima, Hidetoshi Hayashi, Koichi Azuma, Satoshi Hara, Seiji Niho, Ryo Morita, Masafumi Yamaguchi, Toshihide Yokoyama, Kiyotaka Yoh, Takayasu Kurata, Hiroaki Okamoto, Masaki Okamoto, Takashi Kijima, Kazuo Kasahara, Yutaka Fujiwara, Shuji Murakami, Shintaro Kanda, Hiroaki Akamatsu, Shinnosuke Takemoto, Hiroyasu Kaneda, Toshiyuki Kozuki, Masahiko Ando, Yuta Sekino, Haruhiko Fukuda, Yuichiro Ohe, Isamu Okamoto - The Lancet Respiratory Medicine 2024 cited by 39

  17. LBA66 Afatinib versus chemotherapy for treatment-naïve non-small cell lung cancer with a sensitizing uncommon epidermal growth factor receptor mutation: A phase III study (ACHILLES/TORG1834)

    Authors: Satoru Miura, Hiroshi Tanaka, T. Misumi, Hiroshige Yoshioka, Takayasu Kurata, Takaaki Tokito, T. Fukuhara, Yuki Sato, Yoshimasa Shiraishi, Shota Kusuhara, Shunsuke Teraoka, Terufumi Kato, Hidehito Horinouchi, Yuichi Takiguchi, Yasushi Goto, Kosuke Tanaka, Masaki Kanazu, Satoshi Ikeda, Eiki Ichihara, Hiroaki Okamoto - Annals of Oncology 2023 cited by 27

  18. Consensus proposals for classification of the family Hepeviridae

    Authors: Donald B. Smith, Peter Simmonds, Shahid Jameel, Suzanne U. Emerson, Tim J. Harrison, Xiang‐Jin Meng, Hiroaki Okamoto, Wim H. M. van der Poel, Michael A. Purdy - Journal of General Virology 2014 cited by 673

  19. A PSAP motif in the ORF3 protein of hepatitis E virus is necessary for virion release from infected cells

    Authors: Shigeo Nagashima, Masaharu Takahashi, Jirintai, Toshinori Tanaka, Kentaro Yamada, T. Nishizawa, Hiroaki Okamoto - Journal of General Virology 2010 cited by 158

  20. Proposed reference sequences for hepatitis E virus subtypes

    Authors: Donald B. Smith, Peter Simmonds, Jacques Izopet, Edmilson Ferreira de Oliveira-Filho, Rainer G. Ulrich, Reimar Johne, M. Glenn Koenig, Shahid Jameel, Tim J. Harrison, Xiang‐Jin Meng, Hiroaki Okamoto, Wim H. M. van der Poel, Michael A. Purdy - Journal of General Virology 2016 cited by 381

  21. The Japanese Intensive care PAtient Database (JIPAD): A national intensive care unit registry in Japan

    Authors: Hiromasa Irie, Hiroaki Okamoto, Shigehiko Uchino, Hideki Endo, Masatoshi Uchida, Tatsuya Kawasaki, Junji Kumasawa, Takashi Tagami, Hidenobu Shigemitsu, Eiji Hashiba, Yoshitaka Aoki, Hiroshi Kurosawa, Junji Hatakeyama, Nao Ichihara, Satoru Hashimoto, Masaji Nishimura - Journal of Critical Care 2019 cited by 125

  22. Consensus Proposals for a Unified System of Nomenclature of Hepatitis C Virus Genotypes *

    Authors: Peter Simmonds, Jens Bukh, Christophe Combet, Gilbert Deléage, Nobuyuki Enomoto, Stephen M. Feinstone, P. Halfon, Geneviève Inchauspé, Carla Kuiken, Geert Maertens, Masashi Mizokami, Donald G. Murphy, Hiroaki Okamoto, Jean–Michel Pawlotsky, François Pénin, Erwin Sablon, Tadasu Shin‐I, Lieven Stuyver, Heinz‐Jürgen Thiel, Sergei Viazov, Amy J. Weiner, Anders Widell - Hepatology 2005 cited by 1,505

  23. Low-Dose Erlotinib Treatment in Elderly or Frail Patients With EGFR Mutation–Positive Non–Small Cell Lung Cancer

    Authors: Shingo Miyamoto, Koichi Azuma, Hidenobu Ishii, Akihiro Bessho, Shinobu Hosokawa, Nobuaki Fukamatsu, Hideo Kunitoh, Mari Ishii, Hiroshi Tanaka, Hiromi Aono, Yoshiro Nakahara, Kei Kusaka, Yukio Hosomi, Norihiro Kikuchi, Yoshiaki Mori, Hidetoshi Itani, Akinobu Hamada, Kazuhiko Yamada, Hiroaki Okamoto - JAMA Oncology 2020 cited by 50

  24. Polyphyletic Strains of Hepatitis E Virus Are Responsible for Sporadic Cases of Acute Hepatitis in Japan

    Authors: Hitoshi Mizuo, Kazuyuki Suzuki, Yasuhiro Takikawa, Yoshiki Sugai, Hajime Tokita, Yoshihiro Akahane, Keiichi Itoh, Yuhko Gotanda, Masaharu Takahashi, Tsutomu Nishizawa, Hiroaki Okamoto - Journal of Clinical Microbiology 2002 cited by 296