Ken Haruma

22.2k total citations · 2 hit papers
638 papers, 16.2k citations indexed

About

Ken Haruma is a scholar working on Surgery, Gastroenterology and Pulmonary and Respiratory Medicine. According to data from OpenAlex, Ken Haruma has authored 638 papers receiving a total of 16.2k indexed citations (citations by other indexed papers that have themselves been cited), including 467 papers in Surgery, 262 papers in Gastroenterology and 205 papers in Pulmonary and Respiratory Medicine. Recurrent topics in Ken Haruma's work include Helicobacter pylori-related gastroenterology studies (317 papers), Gastroesophageal reflux and treatments (169 papers) and Gastric Cancer Management and Outcomes (155 papers). Ken Haruma is often cited by papers focused on Helicobacter pylori-related gastroenterology studies (317 papers), Gastroesophageal reflux and treatments (169 papers) and Gastric Cancer Management and Outcomes (155 papers). Ken Haruma collaborates with scholars based in Japan, United States and Germany. Ken Haruma's co-authors include Masaharu Yoshihara, Shinji Tanaka, Kazuaki Chayama, Tomoari Kamada, Goro Kajiyama, Yasuhiko Kitadai, Jiro Hata, Hiroaki Kusunoki, Noriaki Manabe and Masanori Ito and has published in prestigious journals such as SHILAP Revista de lepidopterología, Gastroenterology and PLoS ONE.

In The Last Decade

Ken Haruma

609 papers receiving 15.7k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Kyoto global consensus report onHelicobacter pylorigastritis

2015 1.2k citations David Y. Graham, Ken Haruma et al. profile →
Effect of Helicobacter pylori eradication on subsequent development of cancer after endoscopic resection of early gastric cancer.

1997 434 citations Naomi Uemura, Ken Haruma et al. PubMed profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Ken Haruma Japan	63	10.2k	5.7k	5.7k	2.8k	2.5k	638	16.2k
Stuart J. Spechler United States	68	16.6k 1.6×	5.7k 1.0×	9.2k 1.6×	1.7k 0.6×	1.7k 0.7×	352	20.0k
Robert H. Riddell Canada	56	6.4k 0.6×	3.9k 0.7×	2.9k 0.5×	4.1k 1.4×	1.8k 0.7×	215	15.3k
Hidemi Goto Japan	58	6.5k 0.6×	3.6k 0.6×	2.5k 0.4×	3.7k 1.3×	2.2k 0.9×	621	13.5k
Hironori Yamamoto Japan	57	7.2k 0.7×	4.7k 0.8×	5.0k 0.9×	2.1k 0.7×	1.1k 0.5×	419	12.4k
Yong Chan Lee South Korea	46	4.3k 0.4×	4.1k 0.7×	2.1k 0.4×	1.4k 0.5×	1.7k 0.7×	388	8.8k
Shuji Takiguchi Japan	57	4.8k 0.5×	4.7k 0.8×	1.4k 0.2×	2.5k 0.9×	2.5k 1.0×	432	11.1k
Poong‐Lyul Rhee South Korea	50	4.2k 0.4×	2.6k 0.5×	2.9k 0.5×	2.3k 0.8×	1.4k 0.6×	447	9.4k
C. B. H. W. Lamers Netherlands	63	5.0k 0.5×	1.9k 0.3×	2.3k 0.4×	4.6k 1.6×	2.7k 1.1×	518	15.3k
Guido N.J. Tytgat Netherlands	54	6.8k 0.7×	3.9k 0.7×	1.8k 0.3×	2.2k 0.8×	1.6k 0.6×	199	11.3k
Hidekazu Suzuki Japan	50	4.8k 0.5×	2.1k 0.4×	2.0k 0.4×	1.2k 0.4×	1.4k 0.6×	356	8.8k

Countries citing papers authored by Ken Haruma

Since Specialization

Citations

This map shows the geographic impact of Ken Haruma'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 Ken Haruma with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ken Haruma more than expected).

Fields of papers citing papers by Ken Haruma

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ken Haruma. 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 Ken Haruma. The network helps show where Ken Haruma may publish in the future.

Co-authorship network of co-authors of Ken Haruma

This figure shows the co-authorship network connecting the top 25 collaborators of Ken Haruma. A scholar is included among the top collaborators of Ken Haruma 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 Ken Haruma. Ken Haruma is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Ishimura, Norihisa, Nobuyuki Matsuhashi, Junko Fujisaki, et al.. (2025). Cancer Incidence in Japanese Patients With Long‐Segment Barrett's Esophagus—Japan Nationwide 10‐Year Prospective Cohort Study. Digestive Endoscopy. 38(1). e70070–e70070.

Fujita, Minoru, Noriaki Manabe, Munenori Takaoka, et al.. (2025). Clinical and Economic Insights Into Surgery for Colonic Diverticular Perforation: A Long‐Term Observational Cohort Study. Annals of Gastroenterological Surgery. 9(5). 1036–1046.

Kawanaka, Miwa, Ken Nishino, Katsunori Ishii, et al.. (2024). Predictors of Atherosclerotic Cardiovascular Disease Events in Patients with Metabolic Dysfunction-associated Steatotic Liver Disease. Internal Medicine. 64(12). 1791–1798.

Kamada, Tomoari, Hiroaki Kusunoki, Noriaki Manabe, et al.. (2024). Histamine-1 Receptor Antagonist. PubMed. 65(10). 468–469.

Konishi, Takako, Noriaki Manabe, Jun Nakamura, et al.. (2024). A case of strangulated bowel obstruction in which transabdominal ultrasound was useful for preoperative diagnosis. SHILAP Revista de lepidopterología. 19(4). 1480–1483.

Hosokawa, Takayuki, Noriaki Manabe, Hitoshi Mori, et al.. (2023). Brain activity in response to food images in patients with irritable bowel syndrome and functional dyspepsia. Journal of Gastroenterology. 58(12). 1178–1187. 4 indexed citations

Ayaki, Maki, Rika Aoki, Katsuhiro Mabe, et al.. (2023). Characteristic endoscopic findings in early-stage autoimmune gastritis. SHILAP Revista de lepidopterología. 12(3). E332–E338. 4 indexed citations

Ayaki, Maki, Noriaki Manabe, Akemi Gálvez, et al.. (2022). Beige mucosa observable under narrow‐band imaging indicates the active sites of eosinophilic esophagitis. Journal of Gastroenterology and Hepatology. 37(5). 891–897. 6 indexed citations

Matsumoto, Masaru, Noboru Misawa, Momoko Tsuda, et al.. (2022). Expert Consensus Document: Diagnosis for Chronic Constipation with Faecal Retention in the Rectum Using Ultrasonography. Diagnostics. 12(2). 300–300. 14 indexed citations

10.

Manabe, Noriaki, Maki Ayaki, Minoru Fujita, et al.. (2021). Differences in upper esophageal sphincter function and clinical characteristics among the three subtypes of Japanese patients with esophageal achalasia. Esophagus. 19(2). 316–323. 3 indexed citations

11.

Manabe, Noriaki, Minoru Fujita, Maki Ayaki, et al.. (2021). Colorectal neoplasms in melanosis coli: a survey in Japan and a worldwide meta-analysis. International Journal of Colorectal Disease. 36(10). 2177–2188. 8 indexed citations

12.

Nishiyama, Noriko, Hideki Kobara, Maki Ayaki, et al.. (2021). White Spot, a Novel Endoscopic Finding, May Be Associated with Acid-Suppressing Agents and Hypergastrinemia. Journal of Clinical Medicine. 10(12). 2625–2625. 4 indexed citations

13.

Kushima, Ryoji, et al.. (2020). A case of autoimmune gastritis with fundic gland polyp-like pseudopolyps presenting with nodular enterochromaffin-like cell hyperplasia. Clinical Journal of Gastroenterology. 14(1). 98–102. 3 indexed citations

14.

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

15.

Haruma, Ken, et al.. (2015). [Acid related diseases--comparison between western countries and Japan].. PubMed. 73(7). 1081–5. 2 indexed citations

16.

Shiotani, Akiko, Hiroaki Kusunoki, Masanobu Ishii, et al.. (2014). Pilot study of Biomarkers for predicting effectiveness of ramosetron in diarrhea‐predominant irritable bowel syndrome: expression of S100A10 and polymorphisms of TPH 1 . Neurogastroenterology & Motility. 27(1). 82–91. 16 indexed citations

17.

Ito, Masanori, S Tanaka, Toshio Kuwai, et al.. (2003). The specific expression of Hypoxia Inducible Factor‐1α in human gastric mucosa induced by nonsteroidal anti‐inflammatory drugs. Alimentary Pharmacology & Therapeutics. 18(s1). 90–98. 17 indexed citations

18.

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

19.

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

20.

Uemura, Naomi, et al.. (1993). THE CHARACTERISTIC CHANGE OF GASTRIC MUCOSA IN PATIENTS WITH FUNDIC GLAND POLYP AND GASTRIC CANCER. Acta gastro-enterologica belgica. 35(11). 2663–2671. 3 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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