Ken Namikawa

932 total citations
43 papers, 596 citations indexed

About

Ken Namikawa is a scholar working on Pulmonary and Respiratory Medicine, Surgery and Oncology. According to data from OpenAlex, Ken Namikawa has authored 43 papers receiving a total of 596 indexed citations (citations by other indexed papers that have themselves been cited), including 35 papers in Pulmonary and Respiratory Medicine, 31 papers in Surgery and 11 papers in Oncology. Recurrent topics in Ken Namikawa's work include Gastric Cancer Management and Outcomes (30 papers), Esophageal Cancer Research and Treatment (18 papers) and Helicobacter pylori-related gastroenterology studies (13 papers). Ken Namikawa is often cited by papers focused on Gastric Cancer Management and Outcomes (30 papers), Esophageal Cancer Research and Treatment (18 papers) and Helicobacter pylori-related gastroenterology studies (13 papers). Ken Namikawa collaborates with scholars based in Japan, Iceland and India. Ken Namikawa's co-authors include Junko Fujisaki, Yusuke Horiuchi, Toshiaki Hirasawa, Toshiyuki Yoshio, Akiyoshi Ishiyama, Shoichi Yoshimizu, Tomohiro Tsuchida, Tomohiro Tada, Yoshitaka Tokai and Mitsuaki Ishioka and has published in prestigious journals such as SHILAP Revista de lepidopterología, Scientific Reports and International Journal of Molecular Sciences.

In The Last Decade

Ken Namikawa

38 papers receiving 576 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Ken Namikawa Japan 12 424 319 282 141 92 43 596
Katsuro Ichimasa Japan 16 436 1.0× 561 1.8× 283 1.0× 135 1.0× 63 0.7× 63 719
Xiaoping Zou China 16 535 1.3× 308 1.0× 413 1.5× 69 0.5× 102 1.1× 40 659
Takahide Shinagawa Japan 9 168 0.4× 225 0.7× 162 0.6× 82 0.6× 62 0.7× 33 415
Naoto Tamai Japan 17 516 1.2× 474 1.5× 282 1.0× 134 1.0× 136 1.5× 60 721
Kenichi Takeda Japan 9 252 0.6× 433 1.4× 155 0.5× 235 1.7× 60 0.7× 21 575
Yantao Tian China 13 328 0.8× 192 0.6× 199 0.7× 62 0.4× 121 1.3× 61 533
Hirotaka Nakashima Japan 9 339 0.8× 316 1.0× 207 0.7× 164 1.2× 98 1.1× 21 542
Qiu-Cheng Wang China 5 173 0.4× 188 0.6× 123 0.4× 193 1.4× 38 0.4× 7 422
Takemasa Hayashi Japan 19 665 1.6× 875 2.7× 401 1.4× 249 1.8× 177 1.9× 73 1.1k
Yoshimasa Horie Japan 7 306 0.7× 166 0.5× 262 0.9× 158 1.1× 38 0.4× 16 497

Countries citing papers authored by Ken Namikawa

Since Specialization
Citations

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

Fields of papers citing papers by Ken Namikawa

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Ken Namikawa

This figure shows the co-authorship network connecting the top 25 collaborators of Ken Namikawa. A scholar is included among the top collaborators of Ken Namikawa 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 Namikawa. Ken Namikawa 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.
Takamatsu, Manabu, Ken Namikawa, Yoshitaka Tokai, et al.. (2025). Differences in Clinical Characteristics Between Missed and Detected Laryngopharyngeal Cancers. Journal of Gastroenterology and Hepatology. 40(8). 2037–2045. 1 indexed citations
2.
Kodama, Masaaki, Osamu Handa, Mitsushige Sugimoto, et al.. (2025). Endoscopic risk factors to inform early detection of gastric cancer after Helicobacter pylori eradication: Meta‐analysis and systematic review. DEN Open. 5(1). e70086–e70086.
3.
Namikawa, Ken, Manabu Takamatsu, Yoshitaka Tokai, et al.. (2024). Long- vs short-segment Barrett’s esophagus-derived adenocarcinoma: clinical features and outcomes of endoscopic submucosal dissection. Surgical Endoscopy. 38(7). 3636–3644.
4.
Namikawa, Ken & Einar S. Björnsson. (2024). Rebound Acid Hypersecretion after Withdrawal of Long-Term Proton Pump Inhibitor (PPI) Treatment—Are PPIs Addictive?. International Journal of Molecular Sciences. 25(10). 5459–5459. 5 indexed citations
5.
Yoshimizu, Shoichi, Manabu Takamatsu, Hiroshi Kawachi, et al.. (2023). Prediction of the invasion depth of superficial nonampullary duodenal adenocarcinoma. Digestive Endoscopy. 36(8). 927–938. 1 indexed citations
6.
Yoshio, Toshiyuki, Takashi Sasaki, Mitsuaki Ishioka, et al.. (2023). Efficacy and Safety of Self-Expandable Metallic Stent Placement for Malignant Esophageal Fistula. Journal of Clinical Medicine. 12(18). 5859–5859. 2 indexed citations
7.
Tokai, Yoshitaka, Yusuke Horiuchi, Noriko Yamamoto, et al.. (2023). Effect of Helicobacter pylori eradication evaluated using magnifying endoscopy with narrow-band imaging in mixed-type early gastric Cancer. BMC Gastroenterology. 23(1). 425–425.
8.
Namikawa, Ken, Toshiaki Hirasawa, Kaoru Nakano, et al.. (2022). Risk factors for lymph node metastasis and indication of local resection in duodenal neuroendocrine tumors. JGH Open. 6(3). 189–195. 5 indexed citations
9.
Namikawa, Ken, Kaoru Nakano, Yoshitaka Tokai, et al.. (2022). Clinicopathological characteristics of advanced gastric cancer after Helicobacter pylori eradication. JGH Open. 6(12). 833–838.
10.
Yagi, Shusuke, Satoshi Ida, Ken Namikawa, et al.. (2022). Clinical outcomes of palliative treatment for gastric bleeding from incurable gastric cancer. Surgery Today. 53(3). 360–368. 9 indexed citations
11.
Ishioka, Mitsuaki, Toshiyuki Yoshio, Takashi Sasaki, et al.. (2022). Safety and Efficacy of Self-Expandable Metallic Stent Placement Using Low Radial Force Stent for Malignant Dysphagia after Radiotherapy. Digestion. 103(4). 261–268. 2 indexed citations
12.
13.
Tokai, Yoshitaka, Junko Fujisaki, Naoki Ishizuka, et al.. (2021). Usefulness of the l‐type Wako Helicobacter pylori antibody J test. JGH Open. 5(6). 673–678. 6 indexed citations
14.
Ishiyama, Akiyoshi, Ken Namikawa, Yoshitaka Tokai, et al.. (2021). Effect of sprayingl‐menthol on peristalsis resumption during endoscopic submucosal dissection of gastric tumors. JGH Open. 5(6). 653–657. 1 indexed citations
15.
Horiuchi, Yusuke, Toshiaki Hirasawa, Naoki Ishizuka, et al.. (2021). Evaluation of Microvascular Patterns Alone Using Endocytoscopy with Narrow-Band Imaging for Diagnosing Gastric Cancer. Digestion. 103(2). 159–168. 4 indexed citations
16.
Yoshio, Toshiyuki, Yusuke Kato, Yoshimasa Horie, et al.. (2021). Ability of artificial intelligence to detect T1 esophageal squamous cell carcinoma from endoscopic videos and the effects of real-time assistance. Scientific Reports. 11(1). 7759–7759. 31 indexed citations
17.
Namikawa, Ken, Toshiyuki Yoshio, Shoichi Yoshimizu, et al.. (2021). Clinical outcomes of endoscopic resection of preoperatively diagnosed non-circumferential T1a-muscularis mucosae or T1b-submucosa 1 esophageal squamous cell carcinoma. Scientific Reports. 11(1). 6554–6554. 10 indexed citations
18.
Horiuchi, Yusuke, Toshiaki Hirasawa, Naoki Ishizuka, et al.. (2020). Performance of a computer-aided diagnosis system in diagnosing early gastric cancer using magnifying endoscopy videos with narrow-band imaging (with videos). Gastrointestinal Endoscopy. 92(4). 856–865.e1. 59 indexed citations
19.
Ishioka, Mitsuaki, Toshiyuki Yoshio, Yuji Miyamoto, et al.. (2020). Incidence of metachronous cancer after endoscopic submucosal dissection: a comparison between undifferentiated-type and differentiated-type early gastric cancer. Gastrointestinal Endoscopy. 93(3). 557–564.e1. 10 indexed citations
20.
Yagi, Shusuke, Takeru Wakatsuki, Noriko Yamamoto, et al.. (2018). Clinical significance of intratumoral HER2 heterogeneity on trastuzumab efficacy using endoscopic biopsy specimens in patients with advanced HER2 positive gastric cancer. Gastric Cancer. 22(3). 518–525. 57 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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