Ryoji Kushima

10.4k total citations
321 papers, 7.1k citations indexed

About

Ryoji Kushima is a scholar working on Surgery, Pulmonary and Respiratory Medicine and Oncology. According to data from OpenAlex, Ryoji Kushima has authored 321 papers receiving a total of 7.1k indexed citations (citations by other indexed papers that have themselves been cited), including 163 papers in Surgery, 137 papers in Pulmonary and Respiratory Medicine and 78 papers in Oncology. Recurrent topics in Ryoji Kushima's work include Gastric Cancer Management and Outcomes (100 papers), Helicobacter pylori-related gastroenterology studies (63 papers) and Gastrointestinal Tumor Research and Treatment (49 papers). Ryoji Kushima is often cited by papers focused on Gastric Cancer Management and Outcomes (100 papers), Helicobacter pylori-related gastroenterology studies (63 papers) and Gastrointestinal Tumor Research and Treatment (49 papers). Ryoji Kushima collaborates with scholars based in Japan, United States and Germany. Ryoji Kushima's co-authors include Takanori Hattori, Shigeki Sekine, Hitoshi Tsuda, Akihiko Yoshida, Hirokazu Taniguchi, F Borchard, Hitoshi Katai, Hidetoshi Okabe, Hisao Asamura and Hiroyuki Sugihara and has published in prestigious journals such as Journal of Clinical Oncology, SHILAP Revista de lepidopterología and Gastroenterology.

In The Last Decade

Ryoji Kushima

297 papers receiving 6.9k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Ryoji Kushima Japan 45 3.0k 2.7k 2.0k 1.5k 1.2k 321 7.1k
Takashi Yao Japan 50 4.3k 1.4× 4.5k 1.7× 3.2k 1.6× 1.9k 1.3× 2.1k 1.8× 451 10.3k
Tadashi Terada Japan 49 1.6k 0.5× 4.2k 1.5× 2.6k 1.3× 1.9k 1.2× 678 0.6× 443 8.7k
Hidetaka Yamamoto Japan 42 2.7k 0.9× 1.7k 0.6× 2.1k 1.1× 1.6k 1.0× 780 0.7× 336 6.9k
Shunichi Tsujitani Japan 41 3.2k 1.1× 2.2k 0.8× 2.0k 1.0× 1.5k 1.0× 1.2k 1.0× 198 6.1k
Yukihiro Nakanishi Japan 46 4.2k 1.4× 3.0k 1.1× 2.2k 1.1× 2.3k 1.5× 1.6k 1.3× 189 8.3k
Jean–François Fléjou France 50 2.4k 0.8× 4.8k 1.8× 4.3k 2.2× 1.6k 1.1× 698 0.6× 263 10.2k
Tetsuo Ushiku Japan 35 1.5k 0.5× 1.6k 0.6× 2.0k 1.0× 1.5k 1.0× 357 0.3× 305 5.0k
Hidenobu Watanabe Japan 46 3.3k 1.1× 4.3k 1.6× 2.9k 1.5× 882 0.6× 938 0.8× 192 7.0k
Elena Tamborini Italy 44 3.3k 1.1× 1.1k 0.4× 1.8k 0.9× 1.1k 0.7× 1.1k 0.9× 144 5.6k
Yoichi Ajioka Japan 44 3.5k 1.2× 3.2k 1.2× 3.1k 1.6× 806 0.5× 1.0k 0.9× 248 6.6k

Countries citing papers authored by Ryoji Kushima

Since Specialization
Citations

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

Fields of papers citing papers by Ryoji Kushima

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Ryoji Kushima

This figure shows the co-authorship network connecting the top 25 collaborators of Ryoji Kushima. A scholar is included among the top collaborators of Ryoji Kushima 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 Ryoji Kushima. Ryoji Kushima 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.
Yamazaki, Kenji, Yasuhiko Maruyama, Ryoji Kushima, et al.. (2025). Revealing autoimmune gastritis: Polypoid nodule scar development after endoscopic submucosal dissection for early gastric cancer. DEN Open. 5(1). e70094–e70094.
2.
Shibagaki, Kotaro, Ryoji Kushima, Shigeki Sekine, et al.. (2025). Spectrum of gastric neoplasms in Helicobacter pylori‐naïve patients. Digestive Endoscopy. 37(6). 611–628. 3 indexed citations
3.
Ishigaki, Hirohito, Toshimasa Ikeda, Akio Akagi, et al.. (2024). Histopathological Investigation of Progressive Encephalomyelitis with Rigidity and Myoclonus: An Autopsy Case Characterized by Oculomotor Dysfunction and Autonomic Failure. Internal Medicine. 64(4). 597–602. 1 indexed citations
4.
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
5.
Terao, Shuichi, Shiho Suzuki, & Ryoji Kushima. (2023). Histopathologic diagnosis of ultra‐early autoimmune gastritis: A case report. SHILAP Revista de lepidopterología. 11(6). e7458–e7458. 5 indexed citations
6.
Takao, Toshitatsu, M. Asahara, Tetsuya Yoshizaki, et al.. (2023). Clinicopathological Features and the Prevalence of Oxyntic Gland Neoplasm: A Single-center Retrospective Study. Internal Medicine. 62(19). 2763–2774. 4 indexed citations
7.
Pai, Rish K., Ian Brown, Anthony J. Gill, et al.. (2022). Subtyping intestinal metaplasia in patients with chronic atrophic gastritis: an interobserver variability study. Pathology. 54(3). 262–268. 6 indexed citations
8.
Yachida, Tatsuo, Taku Sakamoto, Takeshi Nakajima, et al.. (2022). Endoscopic features of colorectal lymphoma according to histological type. JGH Open. 6(4). 257–262. 6 indexed citations
9.
Kushima, Ryoji, et al.. (2022). Early autoimmune gastritis presenting with a normal endoscopic appearance. Clinical Journal of Gastroenterology. 15(3). 547–552. 11 indexed citations
10.
Mukaisho, Ken‐ichi, Susumu Kageyama, Takahisa Nakayama, et al.. (2021). Differences in the Central Energy Metabolism of Cancer Cells between Conventional 2D and Novel 3D Culture Systems. International Journal of Molecular Sciences. 22(4). 1805–1805. 28 indexed citations
11.
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
12.
Matsunaga, Takashi, Tsuyoshi Yamaguchi, Sachiko Kaida, et al.. (2019). [Study of Eight Cases of Retroperitoneal Liposarcoma].. PubMed. 46(13). 2104–2106. 1 indexed citations
13.
Taniguchi, Shoji, et al.. (2014). Duodenal mucosal damage is associated with proliferative activity of Brunner’s gland hamartoma: a case report. BMC Gastroenterology. 14(1). 14–14. 20 indexed citations
14.
Sekine, Shigeki, et al.. (2013). Consistent absence of HER2 expression, regardless of HER2 amplification status, in neuroendocrine carcinomas of the stomach. Histopathology. 64(7). 1027–1031. 11 indexed citations
15.
Kushima, Ryoji, Ken‐ichi Mukaisho, Shunsuke Takemura, et al.. (2013). Barrett-Ösophagus. Der Pathologe. 34(2). 138–147. 5 indexed citations
16.
Yamaguchi, Tomohiro, Hirokazu Taniguchi, Shin Fujita, et al.. (2012). Clinicopathological characteristics and prognostic factors of advanced colorectal mucinous adenocarcinoma. Histopathology. 61(2). 162–169. 32 indexed citations
17.
Minami, Kahori, Tokuhiro Chano, Takahiro Kawakami, et al.. (2010). DNMT3L Is a Novel Marker and Is Essential for the Growth of Human Embryonal Carcinoma. Clinical Cancer Research. 16(10). 2751–2759. 45 indexed citations
18.
Shintaku, Masayuki, Ryoji Kushima, & Kaoru Abiko. (2009). Colloid carcinoma of the intestinal type in the uterine cervix: Mucin immunohistochemistry. Pathology International. 60(2). 119–124. 5 indexed citations
19.
Ishida, Mitsuaki, et al.. (2009). A case of porocarcinoma arising in pigmented hidroacanthoma simplex with multiple lymph node, liver and bone metastases. Journal of Cutaneous Pathology. 38(2). 227–231. 12 indexed citations
20.
Hattori, Takanori & Ryoji Kushima. (2001). Das gastral differenzierte Magenadenokarzinom. Der Pathologe. 22(2). 97–104. 4 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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