Toshiyasu Ojima
About
Toshiyasu Ojima is a scholar working on Pulmonary and Respiratory Medicine, Surgery and Gastroenterology.
According to data from OpenAlex, Toshiyasu Ojima has authored 131 papers receiving a total of 2.0k indexed citations (citations by other indexed papers that have themselves been cited), including 77 papers in Pulmonary and Respiratory Medicine, 66 papers in Surgery and 39 papers in Gastroenterology. Recurrent topics in Toshiyasu Ojima's work include Gastric Cancer Management and Outcomes (70 papers), Gastrointestinal Tumor Research and Treatment (38 papers) and Esophageal Cancer Research and Treatment (33 papers). Toshiyasu Ojima is often cited by papers focused on Gastric Cancer Management and Outcomes (70 papers), Gastrointestinal Tumor Research and Treatment (38 papers) and Esophageal Cancer Research and Treatment (33 papers). Toshiyasu Ojima collaborates with scholars based in Japan, United States and United Kingdom. Toshiyasu Ojima's co-authors include Hiroki Yamaue, Masaki Nakamura, Mikihito Nakamori, Masahiro Katsuda, Keiji Hayata, Makoto Iwahashi, Takeshi Iida, Teiji Naka, Kentaro Ueda and Junya Kitadani and has published in prestigious journals such as Journal of Clinical Oncology, SHILAP Revista de lepidopterología and Gastroenterology.
In The Last Decade
Toshiyasu Ojima
125 papers receiving 2.0k citations
Hit Papers
Peers — A (Enhanced Table)
Peers by citation overlap · career bar shows stage (early→late) cites · hero ref
| Name | h | Career | Trend | Papers | Cites | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Toshiyasu Ojima Japan | 25 | 1.1k | 939 | 563 | 498 | 346 | 131 | 2.0k | ||
| Masahiro Katsuda Japan | 23 | 808 0.7× | 688 0.7× | 559 1.0× | 313 0.6× | 307 0.9× | 92 | 1.6k | ||
| Hidefumi Higashi Japan | 23 | 444 0.4× | 749 0.8× | 633 1.1× | 257 0.5× | 272 0.8× | 78 | 1.9k | ||
| Kazuto Harada Japan | 26 | 885 0.8× | 1.1k 1.2× | 749 1.3× | 161 0.3× | 203 0.6× | 129 | 2.3k | ||
| Shigenori Homma Japan | 20 | 503 0.5× | 467 0.5× | 786 1.4× | 185 0.4× | 348 1.0× | 112 | 1.5k | ||
| Keiji Hayata Japan | 21 | 748 0.7× | 601 0.6× | 313 0.6× | 332 0.7× | 124 0.4× | 89 | 1.2k | ||
| Tomoki Inaba Japan | 19 | 530 0.5× | 821 0.9× | 162 0.3× | 444 0.9× | 155 0.4× | 76 | 1.3k | ||
| Junichirou Nasu Japan | 19 | 1.1k 1.0× | 686 0.7× | 523 0.9× | 547 1.1× | 138 0.4× | 60 | 1.7k | ||
| Tomofumi Akasaka Japan | 22 | 1.0k 0.9× | 724 0.8× | 364 0.6× | 454 0.9× | 63 0.2× | 65 | 1.4k | ||
| Takeyuki Misawa Japan | 25 | 514 0.5× | 931 1.0× | 1.1k 1.9× | 73 0.1× | 169 0.5× | 168 | 1.9k | ||
| Kee Myung Lee South Korea | 23 | 636 0.6× | 716 0.8× | 278 0.5× | 296 0.6× | 69 0.2× | 85 | 1.3k |
Countries citing papers authored by Toshiyasu Ojima
Since
Specialization
Citations
This map shows the geographic impact of Toshiyasu Ojima'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 Toshiyasu Ojima with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Toshiyasu Ojima more than expected).
Fields of papers citing papers by Toshiyasu Ojima
Since
Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences
This network shows the impact of papers produced by Toshiyasu Ojima. 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 Toshiyasu Ojima. The network helps show where Toshiyasu Ojima may publish in the future.
Co-authorship network of co-authors of Toshiyasu Ojima
This figure shows the co-authorship network connecting the top 25 collaborators of Toshiyasu Ojima. A scholar is included among the top collaborators of Toshiyasu Ojima 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 Toshiyasu Ojima. Toshiyasu Ojima is excluded from the visualization to improve readability, since they are connected to all nodes in the network.
All Works
1.
Ueda, Yôko, Hiroshi Iwakura, Asako Doi, et al.. (2025). Tryptophan‐sensing receptor GPR142 expression levels are directly regulated by proinflammatory cytokines in ghrelin‐producing cells. FEBS Open Bio. 15(5). 763–772.
2.
Kitadani, Junya, Toshiyasu Ojima, Keiji Hayata, et al.. (2023). Impact of zero anastomotic leakage after esophagectomy followed by whole stomach reconstruction for esophageal cancer: prospective cohort study. Langenbeck s Archives of Surgery. 408(1). 451–451.
3.
Tominaga, Shinta, Toshiyasu Ojima, Motoki Miyazawa, et al.. (2023). Induced pluripotent stem cell-derived dendritic cell vaccine therapy genetically modified on the ubiquitin-proteasome system. Gene Therapy. 30(7-8). 552–559.
4.
Takeuchi, Akihiro, Toshiyasu Ojima, Masahiro Katsuda, et al.. (2022). Venous Invasion Is a Risk Factor for Recurrence of pT1 Gastric Cancer with Lymph Node Metastasis. Journal of Gastrointestinal Surgery. 26(4). 757–763.
5.
Ojima, Toshiyasu, Keiji Hayata, & Hiroki Yamaue. (2022). Robotic Ivor Lewis esophagectomy for gastroesophageal junction cancer (with video). Journal of Visceral Surgery. 159(2). 171–172.
6.
Ojima, Toshiyasu, Keiji Hayata, Junya Kitadani, Akihiro Takeuchi, & Hiroki Yamaue. (2022). Risk Factors of Postoperative Intra-Abdominal Infectious Complications after Robotic Gastrectomy for Gastric Cancer. Oncology. 100(11). 583–590.
7.
Kitadani, Junya, Toshiyasu Ojima, Keiji Hayata, et al.. (2021). Single-incision laparoscopic antrectomy for type I gastric neuroendocrine tumor: a case report. SHILAP Revista de lepidopterología. 7(1). 15–15.
8.
Ojima, Toshiyasu, Masaki Nakamura, Keiji Hayata, et al.. (2020). Laparoscopic Limited Resection for Duodenal Gastrointestinal Stromal Tumors. Journal of Gastrointestinal Surgery. 24(10). 2404–2408.
9.
Nakamura, Masaki, Toshiyasu Ojima, Masahiro Katsuda, et al.. (2020). Phase 1 Study of Combined Chemotherapy of Nab-Paclitaxel, S-1, and Oxaliplatin for Gastric Cancer with Peritoneal Metastasis (NSOX Study). Oncology. 99(1). 57–61.
10.
Ojima, Toshiyasu, Katsunari Takifuji, Masaki Nakamura, et al.. (2020). Endoscopic submucosal tunnel dissection versus conventional endoscopic submucosal dissection for early gastric cancers: outcomes of 799 consecutive cases in a single institution. Surgical Endoscopy. 34(12). 5625–5631.
11.
Ojima, Toshiyasu, Masaki Nakamura, Keiji Hayata, & Hiroki Yamaue. (2020). Robotic D2 total gastrectomy with en-mass removal of the spleen and body and tail of the pancreas for locally advanced gastric cancer. Surgical Oncology. 35. 22–23.
12.
Ojima, Toshiyasu, Masaki Nakamura, Mikihito Nakamori, et al.. (2019). Robotic radical lymphadenectomy without touching the pancreas during gastrectomy for gastric cancer. Medicine. 98(13). e15091–e15091.
13.
Tsuji, Toshiaki, Toshiyasu Ojima, Mikihito Nakamori, et al.. (2019). Triangulating stapling vs functional end-to-end stapling for cervical esophagogastric anastomosis after esophagectomy for thoracic esophageal cancer: study protocol for a randomized controlled trial. Trials. 20(1). 83–83.
14.
Hayata, Keiji, Toshiyasu Ojima, Mikihito Nakamori, et al.. (2018). Neoadjuvant Chemotherapy with Docetaxel, Cisplatin and S-1 for Resectable Advanced Esophageal Cancer. Anticancer Research. 38(9). 5267–5273.
15.
Nakamura, Masaki, Mikihito Nakamori, Toshiyasu Ojima, et al.. (2016). The effects of rikkunshito on body weight loss after esophagectomy. Journal of Surgical Research. 204(1). 130–138.
16.
Ojima, Toshiyasu, Mikihito Nakamori, Masaki Nakamura, et al.. (2016). Expression of BRCA1, a factor closely associated with relapse-free survival, in patients who underwent neoadjuvant chemotherapy with docetaxel, cisplatin, and fluorouracil for squamous cell carcinoma of the esophagus. Surgery Today. 47(1). 65–73.
17.
Ojima, Toshiyasu, Katsunari Takifuji, Masaki Nakamura, Mikihito Nakamori, & Hiroki Yamaue. (2015). Long-term Survival of Patients With Endoscopic Submucosal Dissection for Remnant Gastric Cancers. Surgical Laparoscopy Endoscopy & Percutaneous Techniques. 26(1). 78–81.
18.
Nakamura, Masaki, et al.. (2011). A CASE OF PSEUDOMEMBRANOUS ENTEROCOLITIS CAUSED BY METHICILLIN-RESISTANT STAPHYLOCOCCUS AUREUS IN THE INTERPOSED ILEUM AFTER ESOPHAGECTOMY. Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association). 72(10). 2524–2529.
19.
Koike, Yumi, Makoto Iwahashi, Mikihito Nakamori, et al.. (2010). The Prospective Study to Evaluate the Effect of Preoperative Cardiopulmonary Function Reinforcement Training for Patients with Esophageal Cancer. The Japanese Journal of Gastroenterological Surgery. 43(5). 487–494.
20.
Naka, Teiji, Makoto Iwahashi, Masaki Nakamura, et al.. (2008). Tumor vaccine therapy against recrudescent tumor using dendritic cells simultaneously transfected with tumor RNA and granulocyte macrophage colony‐stimulating factor RNA. Cancer Science. 99(2). 407–413.
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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