World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Medicine 80 17121 16095 544 512 831 23124

Ken Haruma publications per year

The chart shows the history of publications by Ken Haruma between 1985 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Ken Haruma published across 41 years, from 1985 to 2025, averaging 21.5 papers a year. Output peaked at 47 publications in 2000. 42 of the 881 publications appeared in the last two years.

No. of publications
10 20 30 40
Bar chart. Horizontal axis: year, 1985 to 2025. Vertical axis: number of publications, 0 to 47. Peak 47 publications in 2000. 1985: 1 publication 1986: 2 publications 1987: 7 publications 1988: 7 publications 1989: 6 publications 1990: 8 publications 1991: 6 publications 1992: 13 publications 1993: 18 publications 1994: 11 publications 1995: 21 publications 1996: 5 publications 1997: 13 publications 1998: 31 publications 1999: 11 publications 2000: 47 publications 2001: 33 publications 2002: 28 publications 2003: 39 publications 2004: 12 publications 2005: 11 publications 2006: 22 publications 2007: 29 publications 2008: 29 publications 2009: 35 publications 2010: 34 publications 2011: 34 publications 2012: 29 publications 2013: 37 publications 2014: 23 publications 2015: 29 publications 2016: 26 publications 2017: 29 publications 2018: 20 publications 2019: 16 publications 2020: 18 publications 2021: 34 publications 2022: 38 publications 2023: 27 publications 2024: 24 publications 2025: 18 publications
1985 2025

881 publications in total across all disciplines

View publications per year as a table
Ken Haruma: publications per year, 1985 to 2025
Year Publications
1985 1
1986 2
1987 7
1988 7
1989 6
1990 8
1991 6
1992 13
1993 18
1994 11
1995 21
1996 5
1997 13
1998 31
1999 11
2000 47
2001 33
2002 28
2003 39
2004 12
2005 11
2006 22
2007 29
2008 29
2009 35
2010 34
2011 34
2012 29
2013 37
2014 23
2015 29
2016 26
2017 29
2018 20
2019 16
2020 18
2021 34
2022 38
2023 27
2024 24
2025 18
Total 881
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Ken Haruma 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 Ken Haruma 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, 821–840 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: 831 publications — 89th percentile

89% 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
821–840 186 831
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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Ken Haruma 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 Ken Haruma 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, 80–81 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: 80 D-Index — 16th percentile

16% 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 80
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
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

Ken Haruma is affiliated with Hiroshima University in Japan, contributing extensively to the field of medicine with a focus on gastroenterology and related subfields. Their scholarly output spans numerous publications with an emphasis on surgery, pulmonary and respiratory medicine, epidemiology, and oncology.

The scientist's primary areas of research cover a range of topics, including:

  • Helicobacter pylori-related gastroenterology studies
  • Eosinophilic Esophagitis
  • Gastroesophageal reflux and treatments
  • Gastric Cancer Management and Outcomes
  • Esophageal and GI Pathology
  • Esophageal Cancer Research and Treatment
  • Gastrointestinal disorders and treatments

Ken Haruma's recent academic papers demonstrate engagement with current issues in gastroenterology and digestive diseases. Notable publications include:

  • "Endoscopic screening for gastric cancer in Japan: Current status and future perspectives" (2021) published in Digestive Endoscopy
  • "Linked Color Imaging Focused on Neoplasm Detection in the Upper Gastrointestinal Tract" (2020) published in Annals of Internal Medicine
  • "Endoscopic features and clinical importance of autoimmune gastritis" (2021) published in Digestive Endoscopy
  • "Epidemiological Review of Gastroesophageal Junction Adenocarcinoma in Asian Countries" (2021) published in Digestion
  • "Diagnostic criteria and endoscopic and histological findings of autoimmune gastritis in Japan" (2023) published in Journal of Gastroenterology

The scientist collaborates frequently with other researchers, including:

  • Noriaki Manabe
  • Mitsuhiko Suehiro
  • Hirofumi Kawamoto
  • Maki Ayaki
  • Minoru Fujita

Ken Haruma has published mainly in recognized journals, with a concentration in venues such as:

  • Gastroenterology
  • Internal Medicine
  • Clinical Journal of Gastroenterology
  • Gastrointestinal Endoscopy
  • Digestive Endoscopy

This body of work places Ken Haruma prominently within the medical research community focusing on digestive diseases, surgical techniques, and cancer epidemiology relevant to gastroenterology. Their contributions to these areas are supported by extensive collaborations and publications in specialized and high-impact journals.

Best Publications

  • Kyoto global consensus report on Helicobacter pylori gastritis

    Kentaro Sugano;Jan Tack;Ernst J Kuipers;David Y Graham

  • Clinicopathologic features and endoscopic treatment of superficially spreading colorectal neoplasms larger than 20 mm

    Shinji Tanaka;Ken Haruma;Shiro Oka;Ryoji Takahashi

  • Expression of interleukin-8 correlates with vascularity in human gastric carcinomas.

    Yasuhiko Kitadai;Ken Haruma;Koji Sumii;Soichiro Yamamoto

  • Evidence-based Clinical Practice Guidelines for Gastroesophageal Reflux Disease 2015

    Katsuhiko Iwakiri;Yoshikazu Kinoshita;Yasuki Habu;Tadayuki Oshima

  • Clinicopathological significance of vascular endothelial growth factor (VEGF)-C in human esophageal squamous cell carcinomas.

    Yasuhiko Kitadai;Toru Amioka;Ken Haruma;Shinji Tanaka

  • Helicobacter pylori eradication therapy improves atrophic gastritis and intestinal metaplasia: a 5-year prospective study of patients with atrophic gastritis.

    M. Ito;K. Haruma;T. Kamada;M. Mihara

  • High incidence of reflux oesophagitis after eradication therapy for Helicobacter pylori: impacts of hiatal hernia and corpus gastritis

    H Hamada;K Haruma;M Mihara;T Kamada

  • Treatment of ulcerative colitis by feeding with germinated barley foodstuff: first report of a multicenter open control trial

    Osamu Kanauchi;Toshihiro Suga;Masahiro Tochihara;Toshifumi Hibi

  • Endoscopic treatment of submucosal invasive colorectal carcinoma with special reference to risk factors for lymph node metastasis

    Shinji Tanaka;Ken Haruma;Claudio R. Teixeira;Shigehiko Tatsuta

  • Monocyte chemoattractant protein-1 expression correlates with macrophage infiltration and tumor vascularity in human esophageal squamous cell carcinomas.

    Masahiro Ohta;Yasuhiko Kitadai;Shinji Tanaka;Masaharu Yoshihara

  • Evidence-based clinical practice guidelines for functional dyspepsia

    Hiroto Miwa;Motoyasu Kusano;Tomiyasu Arisawa;Tadayuki Oshima

  • Transfection of interleukin-8 increases angiogenesis and tumorigenesis of human gastric carcinoma cells in nude mice

    Y. Kitadai;Y. Takahashi;K. Haruma;K. Naka

  • Effect of age and Helicobacter pylori infection on gastric acid secretion

    Ken Haruma;Tomoari Kamada;Hiroyuki Kawaguchi;Shiro Okamoto

  • Monocyte chemoattractant protein-1 expression correlates with macrophage infiltration and tumor vascularity in human gastric carcinomas

    Masahiro Ohta;Yasuhiko Kitadai;Shinji Tanaka;Masaharu Yoshihara

  • Meta-analysis of the effects of prokinetic agents in patients with functional dyspepsia

    Toru Hiyama;Masaharu Yoshihara;Keitaro Matsuo;Hiroaki Kusunoki

  • Eradication of Helicobacter pylori increases gastric acidity in patients with atrophic gastritis of the corpus-evaluation of 24-h pH monitoring.

    K Haruma;M Mihara;E Okamoto;H Kusunoki

  • Correlation of ratio of serum pepsinogen I and II with prevalence of gastric cancer and adenoma in Japanese subjects.

    Masaharu Yoshihara;Koji Sumii;Ken Haruma;Kuninushi Kiyohira

  • Aged Garlic Extract Has Potential Suppressive Effect on Colorectal Adenomas in Humans

    Shinji Tanaka;Ken Haruma;Masaharu Yoshihara;Goro Kajiyama

  • Interleukin 8 and vascular endothelial growth factor -- prognostic factors in human gastric carcinomas?

    Soichiro Kido;Yasuhiko Kitadai;Nobuaki Hattori;Ken Haruma

  • Clinical features of gastric cancer discovered after successful eradication of Helicobacter pylori: results from a 9-year prospective follow-up study in Japan.

    T. Kamada;J. Hata;K. Sugiu;H. Kusunoki

Frequent Co-Authors

Masaharu Yoshihara
Masaharu Yoshihara Hiroshima University
Yasuhiko Kitadai
Yasuhiko Kitadai Prefectural University of Hiroshima
Shinji Tanaka
Shinji Tanaka Hiroshima University
Kazuaki Chayama
Kazuaki Chayama Hiroshima University
Eiichi Tahara
Eiichi Tahara Hiroshima University
Wataru Yasui
Wataru Yasui Hiroshima University
Hiroshi Yokozaki
Hiroshi Yokozaki Kobe University
Keizo Sugimachi
Keizo Sugimachi Kyushu University
Isaiah J. Fidler
Isaiah J. Fidler The University of Texas MD Anderson Cancer Center
Seigo Kitano
Seigo Kitano Oita University

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