Koji Sumii

2.4k total citations
77 papers, 2.0k citations indexed

About

Koji Sumii is a scholar working on Surgery, Pulmonary and Respiratory Medicine and Oncology. According to data from OpenAlex, Koji Sumii has authored 77 papers receiving a total of 2.0k indexed citations (citations by other indexed papers that have themselves been cited), including 46 papers in Surgery, 29 papers in Pulmonary and Respiratory Medicine and 19 papers in Oncology. Recurrent topics in Koji Sumii's work include Helicobacter pylori-related gastroenterology studies (37 papers), Gastric Cancer Management and Outcomes (22 papers) and Gastroesophageal reflux and treatments (13 papers). Koji Sumii is often cited by papers focused on Helicobacter pylori-related gastroenterology studies (37 papers), Gastric Cancer Management and Outcomes (22 papers) and Gastroesophageal reflux and treatments (13 papers). Koji Sumii collaborates with scholars based in Japan, United States and Australia. Koji Sumii's co-authors include Ken Haruma, Masaharu Yoshihara, Goro Kajiyama, Shinji Tanaka, Yasuhiko Kitadai, Fumio Shimamoto, Tomoari Kamada, Kazuaki Chayama, Akira Tari and Hiroyuki Kawaguchi and has published in prestigious journals such as Gastroenterology, Cancer and Oncogene.

In The Last Decade

Koji Sumii

77 papers receiving 1.9k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Koji Sumii Japan 25 1.0k 617 604 550 470 77 2.0k
Shusaku Tsutsui Japan 23 697 0.7× 306 0.5× 625 1.0× 390 0.7× 482 1.0× 65 1.6k
Tomio Ueno Japan 25 725 0.7× 880 1.4× 378 0.6× 391 0.7× 101 0.2× 90 1.8k
Tamotsu Miyazaki Japan 19 598 0.6× 137 0.2× 266 0.4× 424 0.8× 207 0.4× 88 1.5k
Kenichiro Watanabe Japan 20 340 0.3× 313 0.5× 303 0.5× 428 0.8× 178 0.4× 134 1.5k
Hirofumi Koga Japan 24 553 0.5× 379 0.6× 589 1.0× 569 1.0× 40 0.1× 85 2.1k
S A Watson United Kingdom 19 490 0.5× 382 0.6× 194 0.3× 277 0.5× 87 0.2× 34 1.1k
K Kinoshita Japan 16 308 0.3× 298 0.5× 238 0.4× 425 0.8× 59 0.1× 65 1.2k
Akira Tari Japan 17 444 0.4× 275 0.4× 241 0.4× 115 0.2× 313 0.7× 52 990
Steffan D. Bos Netherlands 21 252 0.2× 170 0.3× 219 0.4× 526 1.0× 225 0.5× 44 1.5k
Revati Shreeniwas United States 16 292 0.3× 179 0.3× 198 0.3× 1.2k 2.2× 197 0.4× 18 2.3k

Countries citing papers authored by Koji Sumii

Since Specialization
Citations

This map shows the geographic impact of Koji Sumii's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Koji Sumii with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Koji Sumii more than expected).

Fields of papers citing papers by Koji Sumii

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Koji Sumii. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Koji Sumii. The network helps show where Koji Sumii may publish in the future.

Co-authorship network of co-authors of Koji Sumii

This figure shows the co-authorship network connecting the top 25 collaborators of Koji Sumii. A scholar is included among the top collaborators of Koji Sumii based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Koji Sumii. Koji Sumii is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Kamada, Tomoari, Ken Haruma, Masanori Ito, et al.. (2015). Time Trends in Helicobacter pylori Infection and Atrophic Gastritis Over 40 Years in Japan. Helicobacter. 20(3). 192–198. 78 indexed citations
2.
Tari, Akira, Masanori Kawano, Yoshikazu Yonei, et al.. (2002). The effects of rabeprazole on parietal cells and enterochromaffin-like cells in rats: a comparison with omeprazole. Journal of Gastroenterology. 37(3). 177–185. 7 indexed citations
3.
Tanaka, Shinji, Ken Haruma, Shinji Nagata, et al.. (2001). Evaluation of diagnostic yield in relation to procedure time of screening or surveillance colonoscopy. Gastrointestinal Endoscopy. 53(5). AB185–AB185. 1 indexed citations
4.
Hiyama, Toru, Ken Haruma, Yasuhiko Kitadai, et al.. (2001). Clinicopathological features of gastric mucosa‐associated lymphoid tissue lymphoma: A comparison with diffuse large B‐cell lymphoma without a mucosa‐associated lymphoid tissue lymphoma component. Journal of Gastroenterology and Hepatology. 16(7). 734–739. 23 indexed citations
5.
Kusunoki, Hiroaki, Ken Haruma, Jiro Hata, et al.. (2000). Real‐time ultrasonographic assessment of antroduodenal motility after ingestion of solid and liquid meals by patients with functional dyspepsia. Journal of Gastroenterology and Hepatology. 15(9). 1022–1027. 65 indexed citations
6.
Haruma, Ken, et al.. (2000). Enhanced tumorigenicity of insulinoma by X‐irradiation of the gastric regions in Sprague–Dawley male rats. Journal of Gastroenterology and Hepatology. 15(7). 766–770. 3 indexed citations
7.
Haruma, Ken, Tomoari Kamada, Hiroyuki Kawaguchi, et al.. (2000). Effect of age and Helicobacter pylori infection on gastric acid secretion. Journal of Gastroenterology and Hepatology. 15(3). 277–283. 121 indexed citations
8.
Haruma, Ken, et al.. (2000). Evaluation of lower oesophageal sphincter pressure using endoscopic manometric sleeve assembly. Journal of Gastroenterology and Hepatology. 15(2). 121–126. 9 indexed citations
9.
Nagata, Shinji, Shinji Tanaka, Ken Haruma, et al.. (1999). CLINICOPATHOLOGIC ANALYSIS OF NINE CASESWITH SMALL ADVANCED COLORECTAL CARCINOMAS LESS THAN 10 mm IN MAXIMUM DIAMETER. Acta gastro-enterologica belgica. 41(11). 2358–2367. 1 indexed citations
10.
Kamada, Tomoari, Ken Haruma, Hiroyuki Kawaguchi, et al.. (1998). The Association Between Antral G and D Cells and Mucosal Inflammation, Atrophy, and Helicobacter pylori Infection in Subjects With Normal Mucosa, Chronic Gastritis, and Duodenal Ulcer. The American Journal of Gastroenterology. 93(5). 748–752. 33 indexed citations
11.
Hiraga, Yuko, Shinji Tanaka, Ken Haruma, et al.. (1998). FOLLOW-UP STUDY ON LOCAL RESIDUALI RECURRENCE AND PROGNOSIS OF EARL, Y GASTRIC CANCERS RESECTED ENDOSCO PICALLY. Acta gastro-enterologica belgica. 40(12). 2102–2112. 1 indexed citations
12.
Tanaka, Shinji, Ken Haruma, Jiro Hata, et al.. (1997). ACASE OFI CRONKHITE-CANADA SYNDROME COM:PHCAT:ED WITH CO:LONIC INVAGINATION. Acta gastro-enterologica belgica. 39(9). 1602–1607. 1 indexed citations
13.
Haruma, Ken, Hiroyuki Kawaguchi, Masaharu Yoshihara, et al.. (1994). Relationship Between Helicobacter pylori Infection and Gastric Acid Secretion in Young Healthy Subjects. Journal of Clinical Gastroenterology. 19(1). 20–22. 24 indexed citations
14.
Teixeira, Cláudio Rolim, et al.. (1992). Heterotopic Pancreas Diagnosed by Endoscopic Ultrasonography and Endoscopic Injection of Ethanol to Make a Histologic Diagnosis. Journal of Clinical Gastroenterology. 15(1). 52–54. 6 indexed citations
15.
Haruma, Ken, et al.. (1992). Flow cytometric DNA analysis of gastric smooth muscle tumors. Cancer. 70(8). 2031–2034. 9 indexed citations
16.
Haruma, Ken, Takehiko Suzuki, Toshitaka Tsuda, et al.. (1991). Evaluation of tumor growth rate in patients with early gastric carcinoma of the elevated type. Abdominal Imaging. 16(1). 289–292. 30 indexed citations
17.
Yoshihara, Masaharu, Koji Sumii, Goro Kajiyama, et al.. (1990). Clinical management of group iii lesion. Acta gastro-enterologica belgica. 32(5). 1133–1139. 1 indexed citations
18.
Wu, S. Vincent, Koji Sumii, Akira Tari, M.H. Mogard, & John H. Walsh. (1990). Regulation of gastric somatostatin gene expression. Metabolism. 39(9). 125–130. 16 indexed citations
19.
Haruma, Ken, et al.. (1989). GASTRIC MUCOSA IN PATIENTS WITH FOVEOLAR HYPERPLASTIC GASTRIC POLYPS. Acta gastro-enterologica belgica. 31(8). 2051–2059. 1 indexed citations
20.
Sumii, Koji, Naomi Uemura, Manabu Kimura, et al.. (1987). Recurrence of duodenal ulcers. With special reference to serum pepsinogen 1.:-WITH SPECIAL REFERENCE TO SERUM PEPSINOGEN 1-. Acta gastro-enterologica belgica. 29(1). 23–27. 2 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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