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Tadatoshi Takayama

Tadatoshi Takayama

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Medicine 101 7873 7402 196 187 815 44784

Tadatoshi Takayama publications per year

The chart shows the history of publications by Tadatoshi Takayama between 1984 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Tadatoshi Takayama published across 42 years, from 1984 to 2025, averaging 20.2 papers a year. Output peaked at 51 publications in 2000. 3 of the 850 publications appeared in the last two years.

No. of publications
10 20 30 40 50
Bar chart. Horizontal axis: year, 1984 to 2025. Vertical axis: number of publications, 0 to 51. Peak 51 publications in 2000. 1984: 1 publication 1985: 0 publications 1986: 0 publications 1987: 1 publication 1988: 1 publication 1989: 4 publications 1990: 6 publications 1991: 13 publications 1992: 16 publications 1993: 13 publications 1994: 9 publications 1995: 10 publications 1996: 9 publications 1997: 10 publications 1998: 20 publications 1999: 24 publications 2000: 51 publications 2001: 37 publications 2002: 45 publications 2003: 35 publications 2004: 27 publications 2005: 28 publications 2006: 25 publications 2007: 21 publications 2008: 19 publications 2009: 23 publications 2010: 22 publications 2011: 19 publications 2012: 29 publications 2013: 28 publications 2014: 39 publications 2015: 37 publications 2016: 37 publications 2017: 34 publications 2018: 25 publications 2019: 23 publications 2020: 32 publications 2021: 27 publications 2022: 15 publications 2023: 32 publications 2024: 2 publications 2025: 1 publication
1984 2025

850 publications in total across all disciplines

View publications per year as a table
Tadatoshi Takayama: publications per year, 1984 to 2025
Year Publications
1984 1
1985 0
1986 0
1987 1
1988 1
1989 4
1990 6
1991 13
1992 16
1993 13
1994 9
1995 10
1996 9
1997 10
1998 20
1999 24
2000 51
2001 37
2002 45
2003 35
2004 27
2005 28
2006 25
2007 21
2008 19
2009 23
2010 22
2011 19
2012 29
2013 28
2014 39
2015 37
2016 37
2017 34
2018 25
2019 23
2020 32
2021 27
2022 15
2023 32
2024 2
2025 1
Total 850
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Tadatoshi Takayama publication distribution in Medicine in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Medicine in 2026. The highlighted bar marks where Tadatoshi Takayama sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 86 bars. Horizontal axis: publications, 101–120 to 1,796+. Vertical axis: number of scientists, 0 to 922. Most scientists, 922, have 341–360 publications. The last bar groups every scientist with 1,796 publications or more. The highlighted bar, 801–820 publications, is where this scientist sits. 101–120 publications: 5 scientists 121–140 publications: 26 scientists 141–160 publications: 73 scientists 161–180 publications: 155 scientists 181–200 publications: 230 scientists 201–220 publications: 363 scientists 221–240 publications: 487 scientists 241–260 publications: 545 scientists 261–280 publications: 722 scientists 281–300 publications: 768 scientists 301–320 publications: 834 scientists 321–340 publications: 895 scientists 341–360 publications: 922 scientists 361–380 publications: 838 scientists 381–400 publications: 861 scientists 401–420 publications: 918 scientists 421–440 publications: 806 scientists 441–460 publications: 771 scientists 461–480 publications: 751 scientists 481–500 publications: 713 scientists 501–520 publications: 617 scientists 521–540 publications: 610 scientists 541–560 publications: 537 scientists 561–580 publications: 504 scientists 581–600 publications: 509 scientists 601–620 publications: 396 scientists 621–640 publications: 386 scientists 641–660 publications: 371 scientists 661–680 publications: 340 scientists 681–700 publications: 336 scientists 701–720 publications: 307 scientists 721–740 publications: 259 scientists 741–760 publications: 230 scientists 761–780 publications: 228 scientists 781–800 publications: 217 scientists 801–820 publications: 204 scientists 821–840 publications: 186 scientists 841–860 publications: 177 scientists 861–880 publications: 155 scientists 881–900 publications: 139 scientists 901–920 publications: 145 scientists 921–940 publications: 116 scientists 941–960 publications: 133 scientists 961–980 publications: 91 scientists 981–1,000 publications: 96 scientists 1,001–1,020 publications: 77 scientists 1,021–1,040 publications: 70 scientists 1,041–1,060 publications: 63 scientists 1,061–1,080 publications: 77 scientists 1,081–1,100 publications: 49 scientists 1,101–1,120 publications: 54 scientists 1,121–1,140 publications: 49 scientists 1,141–1,160 publications: 51 scientists 1,161–1,180 publications: 35 scientists 1,181–1,200 publications: 39 scientists 1,201–1,220 publications: 26 scientists 1,221–1,240 publications: 37 scientists 1,241–1,260 publications: 36 scientists 1,261–1,280 publications: 27 scientists 1,281–1,300 publications: 32 scientists 1,301–1,320 publications: 28 scientists 1,321–1,340 publications: 17 scientists 1,341–1,360 publications: 30 scientists 1,361–1,380 publications: 28 scientists 1,381–1,400 publications: 17 scientists 1,401–1,420 publications: 21 scientists 1,421–1,440 publications: 15 scientists 1,441–1,460 publications: 12 scientists 1,461–1,480 publications: 12 scientists 1,481–1,500 publications: 18 scientists 1,501–1,520 publications: 14 scientists 1,521–1,540 publications: 17 scientists 1,541–1,560 publications: 15 scientists 1,561–1,580 publications: 6 scientists 1,581–1,600 publications: 2 scientists 1,601–1,620 publications: 12 scientists 1,621–1,640 publications: 11 scientists 1,641–1,660 publications: 8 scientists 1,661–1,680 publications: 5 scientists 1,681–1,700 publications: 5 scientists 1,701–1,720 publications: 10 scientists 1,721–1,740 publications: 12 scientists 1,741–1,760 publications: 14 scientists 1,761–1,780 publications: 6 scientists 1,781–1,795 publications: 5 scientists 1,796+ publications: 100 scientists
101–120 publications 1,796+

This scientist: 815 publications — 88th percentile

88% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,796 publications or more.

View publications distribution as a table
Number of Medicine scientists by publication count, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
Publications Scientists This scientist
101–120 5
121–140 26
141–160 73
161–180 155
181–200 230
201–220 363
221–240 487
241–260 545
261–280 722
281–300 768
301–320 834
321–340 895
341–360 922
361–380 838
381–400 861
401–420 918
421–440 806
441–460 771
461–480 751
481–500 713
501–520 617
521–540 610
541–560 537
561–580 504
581–600 509
601–620 396
621–640 386
641–660 371
661–680 340
681–700 336
701–720 307
721–740 259
741–760 230
761–780 228
781–800 217
801–820 204 815
821–840 186
841–860 177
861–880 155
881–900 139
901–920 145
921–940 116
941–960 133
961–980 91
981–1,000 96
1,001–1,020 77
1,021–1,040 70
1,041–1,060 63
1,061–1,080 77
1,081–1,100 49
1,101–1,120 54
1,121–1,140 49
1,141–1,160 51
1,161–1,180 35
1,181–1,200 39
1,201–1,220 26
1,221–1,240 37
1,241–1,260 36
1,261–1,280 27
1,281–1,300 32
1,301–1,320 28
1,321–1,340 17
1,341–1,360 30
1,361–1,380 28
1,381–1,400 17
1,401–1,420 21
1,421–1,440 15
1,441–1,460 12
1,461–1,480 12
1,481–1,500 18
1,501–1,520 14
1,521–1,540 17
1,541–1,560 15
1,561–1,580 6
1,581–1,600 2
1,601–1,620 12
1,621–1,640 11
1,641–1,660 8
1,661–1,680 5
1,681–1,700 5
1,701–1,720 10
1,721–1,740 12
1,741–1,760 14
1,761–1,780 6
1,781–1,795 5
1,796+ 100
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Tadatoshi Takayama D-index placement in Medicine in 2026

The chart shows the D-index (discipline H-index) distribution of Medicine scientists ranked by Research.com in 2026. The highlighted bar marks where Tadatoshi Takayama sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 75 bars. Horizontal axis: D-Index, 70–71 to 217+. Vertical axis: number of scientists, 0 to 1,027. Most scientists, 1,027, have 82–83 D-Index. The last bar groups every scientist with 217 D-Index or more. The highlighted bar, 100–101 D-Index, is where this scientist sits. 70–71 D-Index: 226 scientists 72–73 D-Index: 391 scientists 74–75 D-Index: 574 scientists 76–77 D-Index: 730 scientists 78–79 D-Index: 891 scientists 80–81 D-Index: 972 scientists 82–83 D-Index: 1,027 scientists 84–85 D-Index: 1,003 scientists 86–87 D-Index: 960 scientists 88–89 D-Index: 970 scientists 90–91 D-Index: 922 scientists 92–93 D-Index: 839 scientists 94–95 D-Index: 808 scientists 96–97 D-Index: 779 scientists 98–99 D-Index: 668 scientists 100–101 D-Index: 611 scientists 102–103 D-Index: 630 scientists 104–105 D-Index: 513 scientists 106–107 D-Index: 541 scientists 108–109 D-Index: 445 scientists 110–111 D-Index: 429 scientists 112–113 D-Index: 399 scientists 114–115 D-Index: 393 scientists 116–117 D-Index: 318 scientists 118–119 D-Index: 302 scientists 120–121 D-Index: 287 scientists 122–123 D-Index: 255 scientists 124–125 D-Index: 256 scientists 126–127 D-Index: 252 scientists 128–129 D-Index: 230 scientists 130–131 D-Index: 179 scientists 132–133 D-Index: 168 scientists 134–135 D-Index: 163 scientists 136–137 D-Index: 159 scientists 138–139 D-Index: 134 scientists 140–141 D-Index: 134 scientists 142–143 D-Index: 118 scientists 144–145 D-Index: 109 scientists 146–147 D-Index: 106 scientists 148–149 D-Index: 74 scientists 150–151 D-Index: 79 scientists 152–153 D-Index: 80 scientists 154–155 D-Index: 87 scientists 156–157 D-Index: 57 scientists 158–159 D-Index: 74 scientists 160–161 D-Index: 69 scientists 162–163 D-Index: 60 scientists 164–165 D-Index: 53 scientists 166–167 D-Index: 39 scientists 168–169 D-Index: 42 scientists 170–171 D-Index: 32 scientists 172–173 D-Index: 39 scientists 174–175 D-Index: 40 scientists 176–177 D-Index: 28 scientists 178–179 D-Index: 19 scientists 180–181 D-Index: 23 scientists 182–183 D-Index: 31 scientists 184–185 D-Index: 18 scientists 186–187 D-Index: 20 scientists 188–189 D-Index: 22 scientists 190–191 D-Index: 13 scientists 192–193 D-Index: 21 scientists 194–195 D-Index: 12 scientists 196–197 D-Index: 12 scientists 198–199 D-Index: 14 scientists 200–201 D-Index: 15 scientists 202–203 D-Index: 13 scientists 204–205 D-Index: 10 scientists 206–207 D-Index: 8 scientists 208–209 D-Index: 4 scientists 210–211 D-Index: 12 scientists 212–213 D-Index: 11 scientists 214–215 D-Index: 10 scientists 216 D-Index: 4 scientists 217+ D-Index: 98 scientists
70–71 D-Index 217+

This scientist: 101 D-Index — 61st percentile

61% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 217 D-Index or more.

View D-Index distribution as a table
Number of Medicine scientists by D-index, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
D-Index Scientists This scientist
70–71 226
72–73 391
74–75 574
76–77 730
78–79 891
80–81 972
82–83 1,027
84–85 1,003
86–87 960
88–89 970
90–91 922
92–93 839
94–95 808
96–97 779
98–99 668
100–101 611 101
102–103 630
104–105 513
106–107 541
108–109 445
110–111 429
112–113 399
114–115 393
116–117 318
118–119 302
120–121 287
122–123 255
124–125 256
126–127 252
128–129 230
130–131 179
132–133 168
134–135 163
136–137 159
138–139 134
140–141 134
142–143 118
144–145 109
146–147 106
148–149 74
150–151 79
152–153 80
154–155 87
156–157 57
158–159 74
160–161 69
162–163 60
164–165 53
166–167 39
168–169 42
170–171 32
172–173 39
174–175 40
176–177 28
178–179 19
180–181 23
182–183 31
184–185 18
186–187 20
188–189 22
190–191 13
192–193 21
194–195 12
196–197 12
198–199 14
200–201 15
202–203 13
204–205 10
206–207 8
208–209 4
210–211 12
212–213 11
214–215 10
216 4
217+ 98
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Overview

Tadatoshi Takayama is affiliated with Nihon University in Japan and has a research focus primarily within the field of medicine. Their work spans several subfields including hepatology, surgery, epidemiology, oncology, and pulmonary and respiratory medicine.

The scientist's research covers a variety of topics with significant contributions to studies on hepatocellular carcinoma treatment and prognosis, liver disease diagnosis and treatment, cholangiocarcinoma and gallbladder cancer, pancreatic and hepatic oncology, liver disease and transplantation, gallbladder and bile duct disorders, as well as cancer related to lipids and metabolism.

Takayama has contributed to multiple papers over recent years. Notable publications include:

  • Randomized phase III study of gemcitabine, cisplatin plus S-1 versus gemcitabine, cisplatin for advanced biliary tract cancer (KHBO1401-MITSUBA), 2022, Journal of Hepato-Biliary-Pancreatic Sciences
  • Surgery versus Radiofrequency Ablation for Small Hepatocellular Carcinoma: A Randomized Controlled Trial (SURF Trial), 2021, Liver Cancer
  • Report of the 21st Nationwide Follow-up Survey of Primary Liver Cancer in Japan (2010-2011), 2020, Hepatology Research
  • Liver Cancer Study Group of Japan Clinical Practice Guidelines for Intrahepatic Cholangiocarcinoma, 2022, Liver Cancer
  • Report of the 22nd nationwide follow-up Survey of Primary Liver Cancer in Japan (2012-2013), 2021, Hepatology Research

Frequent coauthors in Takayama's research include Tokio Higaki, Shintaro Yamazaki, Norihiro Kokudo, Nao Yoshida, and Hayato Abe.

Their publications are often found in key venues such as Hepatology Research, BioScience Trends, European Radiology, Surgery, and Journal of Clinical Oncology. These journals are known for their focus on clinical and translational research in digestive diseases and cancer treatment.

Tadatoshi Takayama's body of work encompasses 209 publications in medicine, with concentrated activity in hepatology (58 publications), surgery (46), and epidemiology (39). The scientist's research topics demonstrate an interdisciplinary approach, linking clinical surgery techniques with epidemiological data and oncology studies, thereby contributing to a broad understanding of liver-related diseases and cancers.

Best Publications

  • Risk factors contributing to early and late phase intrahepatic recurrence of hepatocellular carcinoma after hepatectomy

    Hiroshi Imamura;Yutaka Matsuyama;Eiji Tanaka;Takao Ohkubo

  • Preoperative portal embolization to increase safety of major hepatectomy for hilar bile duct carcinoma : a preliminary report

    M Makuuchi;B L Thai;K Takayasu;T Takayama

  • Adoptive immunotherapy to lower postsurgical recurrence rates of hepatocellular carcinoma: a randomised trial.

    Tadatoshi Takayama;Teruaki Sekine;Masatoshi Makuuchi;Susumu Yamasaki

  • One thousand fifty-six hepatectomies without mortality in 8 years.

    Hiroshi Imamura;Yasuji Seyama;Norihiro Kokudo;Atsushi Maema

  • Measurement of liver volume and hepatic functional reserve as a guide to decision-making in resectional surgery for hepatic tumors

    Keiichi Kubota;Masatoshi Makuuchi;Koji Kusaka;Takashi Kobayashi

  • Surgery for small liver cancers

    Masatoshi Makuuchi;Tomoo Kosuge;Tadatoshi Takayama;Susumu Yamazaki

  • Adjuvant sorafenib for hepatocellular carcinoma after resection or ablation (STORM): a phase 3, randomised, double-blind, placebo-controlled trial

    Jordi Bruix;Tadatoshi Takayama;Vincenzo Mazzaferro;Gar Yang Chau

  • Extension of the frontiers of surgical indications in the treatment of liver metastases from colorectal cancer: long-term results.

    Masami Minagawa;Masatoshi Makuuchi;Guido Torzilli;Tadatoshi Takayama

  • Prognostic impact of anatomic resection for hepatocellular carcinoma.

    Kiyoshi Hasegawa;Norihiro Kokudo;Hiroshi Imamura;Yutaka Matsuyama

  • Trans-ancestry mutational landscape of hepatocellular carcinoma genomes

    Yasushi Totoki;Kenji Tatsuno;Kyle R. Covington;Hiroki Ueda

  • Phase III study of sorafenib after transarterial chemoembolisation in Japanese and Korean patients with unresectable hepatocellular carcinoma.

    Masatoshi Kudo;Kazuho Imanaka;Nobuyuki Chida;Kohei Nakachi

  • A snapshot of the effective indications and results of surgery for hepatocellular carcinoma in tertiary referral centers: Is it adherent to the EASL/AASLD recommendations? An observational study of the HCC east-west study group

    Guido Torzilli;Jacques Belghiti;Norihiro Kokudo;Tadatoshi Takayama

  • Malignant transformation of adenomatous hyperplasia to hepatocellular carcinoma.

    T Takayama;T Kosuge;S Yamazaki;H Hasegawa

  • No-mortality liver resection for hepatocellular carcinoma in cirrhotic and noncirrhotic patients: is there a way? A prospective analysis of our approach

    Guido Torzilli;Masatoshi Makuuchi;Kazuto Inoue;Tadatoshi Takayama

  • Selection criteria for repeat hepatectomy in patients with recurrent hepatocellular carcinoma.

    Masami Minagawa;Masatoshi Makuuchi;Tadatoshi Takayama;Norihiro Kokudo

  • Early hepatocellular carcinoma as an entity with a high rate of surgical cure

    Tadatoshi Takayama;Masatoshi Makuuchi;Setsuo Hirohashi;Michiie Sakamoto

  • Survival benefit of liver resection for hepatocellular carcinoma associated with portal vein invasion

    Takashi Kokudo;Kiyoshi Hasegawa;Yutaka Matsuyama;Tadatoshi Takayama

  • Long-Term Outcome of Extended Hemihepatectomy for Hilar Bile Duct Cancer With No Mortality and High Survival Rate

    Yasuji Seyama;Keiichi Kubota;Keiji Sano;Tamaki Noie

  • Evidence-based Clinical Practice Guidelines for Hepatocellular Carcinoma: The Japan Society of Hepatology 2013 update (3rd JSH-HCC Guidelines)

    Norihiro Kokudo;Kiyoshi Hasegawa;Masaaki Akahane;Hiroshi Igaki

  • Clinical practice guidelines for hepatocellular carcinoma: The Japan Society of Hepatology 2017 (4th JSH-HCC guidelines) 2019 update.

    Norihiro Kokudo;Nobuyuki Takemura;Kiyoshi Hasegawa;Tadatoshi Takayama

Frequent Co-Authors

Masatoshi Makuuchi
Masatoshi Makuuchi University of Tokyo
Tomoo Kosuge
Tomoo Kosuge National Cancer Center
Norihiro Kokudo
Norihiro Kokudo National Center For Global Health and Medicine
Yasuhiko Sugawara
Yasuhiko Sugawara Kumamoto University
Michiie Sakamoto
Michiie Sakamoto Keio University
Kiyoshi Hasegawa
Kiyoshi Hasegawa University of Tokyo
Masatoshi Kudo
Masatoshi Kudo Kindai University
Namiki Izumi
Namiki Izumi Musashino Red Cross Hospital
Setsuo Hirohashi
Setsuo Hirohashi National Cancer Research Institute, UK
Hiroyuki Aburatani
Hiroyuki Aburatani University of Tokyo

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