Hiroki Koyama
- Oncology top 5%
- Surgery top 10%
- Cancer Research top 5%
- Hepatology top 2%
- Epidemiology top 10%
- Co-authors
- Takeshi IwanagaOsamu NakadeShingi ImaokaOsamu IshikawaYo SasakiHideo InajiTohru KakuYoshinori Asakawa
- Topics
- Breast Cancer Treatment Studies (19 papers)Cancer Treatment and Pharmacology (15 papers)Bryophyte Studies and Records (8 papers)
- Cited by
- HepatologyCancer ResearchOncology
In The Last Decade
Hiroki Koyama
92 papers receiving 1.9k citations
Peers
Comparison fields: 5 of 134
- Oncology 552
- Surgery 403
- Cancer Research 359
- Hepatology 346
- Epidemiology 298
Countries citing papers authored by Hiroki Koyama
This map shows the geographic impact of Hiroki Koyama'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 Hiroki Koyama with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Hiroki Koyama more than expected).
Fields of papers citing papers by Hiroki Koyama
This network shows the impact of papers produced by Hiroki Koyama. 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 Hiroki Koyama. The network helps show where Hiroki Koyama may publish in the future.
Co-authorship network of co-authors of Hiroki Koyama
This figure shows the co-authorship network connecting the top 25 collaborators of Hiroki Koyama. A scholar is included among the top collaborators of Hiroki Koyama 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 Hiroki Koyama. Hiroki Koyama is excluded from the visualization to improve readability, since they are connected to all nodes in the network.
All Works
| # | Work | Indexed citations |
|---|---|---|
| 1 | 1 | |
| 2 | 1 | |
| 3 | 4 | |
| 4 | 17 | |
| 5 | 5 | |
| 6 | 12 | |
| 7 | 35 | |
| 8 | 3 | |
| 9 | 10 | |
| 10 | 71 | |
| 11 | 16 | |
| 12 | 10 | |
| 13 | 45 | |
| 14 | 15 | |
| 15 | 17 | |
| 16 | 8 | |
| 17 | 30 | |
| 18 | 34 | |
| 19 | 1 | |
| 20 | 45 |
About Hiroki Koyama
Hiroki Koyama is a scholar working on Cancer Research, Oncology and Hepatology, having authored 98 papers that have together received 2.0k indexed citations. Recurring topics across this work include Breast Cancer Treatment Studies (19 papers), Cancer Treatment and Pharmacology (15 papers) and Bryophyte Studies and Records (8 papers). The work is most often cited by research in Hepatology (346 citations), Cancer Research (359 citations) and Oncology (552 citations). Hiroki Koyama has collaborated with scholars based in Japan, Thailand and Germany. Frequent co-authors include Takeshi Iwanaga, Osamu Nakade, Shingi Imaoka, Osamu Ishikawa, Yo Sasaki, Hideo Inaji, Tohru Kaku, Yoshinori Asakawa, Shinzaburo Noguchi and Hiroshi Furukawa. Their work appears in journals such as Journal of Clinical Oncology, PLoS ONE and Cancer.
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.