Hiroki Oyama

904 total citations
39 papers, 311 citations indexed

About

Hiroki Oyama is a scholar working on Surgery, Oncology and Pulmonary and Respiratory Medicine. According to data from OpenAlex, Hiroki Oyama has authored 39 papers receiving a total of 311 indexed citations (citations by other indexed papers that have themselves been cited), including 28 papers in Surgery, 27 papers in Oncology and 20 papers in Pulmonary and Respiratory Medicine. Recurrent topics in Hiroki Oyama's work include Pancreatic and Hepatic Oncology Research (26 papers), Gallbladder and Bile Duct Disorders (17 papers) and Pancreatitis Pathology and Treatment (10 papers). Hiroki Oyama is often cited by papers focused on Pancreatic and Hepatic Oncology Research (26 papers), Gallbladder and Bile Duct Disorders (17 papers) and Pancreatitis Pathology and Treatment (10 papers). Hiroki Oyama collaborates with scholars based in Japan, New Zealand and Israel. Hiroki Oyama's co-authors include Atsushi Miyajima, Yuki Katou, Taketomo Kido, Yuta Koui, Katsuhiko Shirahige, Yousuke Nakai, Tsuyoshi Hamada, Kazunaga Ishigaki, Tatsuya Sato and Sachiko Kanai and has published in prestigious journals such as SHILAP Revista de lepidopterología, Gastroenterology and Gut.

In The Last Decade

Hiroki Oyama

33 papers receiving 301 citations

Peers

Hiroki Oyama
Masataka Hirabaru Japan
Lauren Tufts United States
Matteo Bianchini Italy
Alejandro Recio‐Boiles United States
Toshiyuki Natsume Japan
Songsong Wu China
Anuj Patel United States
Xiu‐He Lv China
Soichiro Kiyono Japan
Haichao Yan China
Masataka Hirabaru Japan
Hiroki Oyama
Citations per year, relative to Hiroki Oyama Hiroki Oyama (= 1×) peers Masataka Hirabaru

Countries citing papers authored by Hiroki Oyama

Since Specialization
Citations

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

Fields of papers citing papers by Hiroki Oyama

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Hiroki Oyama

This figure shows the co-authorship network connecting the top 25 collaborators of Hiroki Oyama. A scholar is included among the top collaborators of Hiroki Oyama 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 Oyama. Hiroki Oyama 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.
Hamada, Tsuyoshi, et al.. (2025). Intraductal Papillary Mucinous Neoplasm and Pancreatic Cancer: Opportunity Knocks Twice. The American Journal of Gastroenterology. 121(2). 312–321.
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Hamada, Tsuyoshi, Hiroki Oyama, Ataru Igarashi, et al.. (2024). Optimal age to discontinue long-term surveillance of intraductal papillary mucinous neoplasms: comparative cost-effectiveness of surveillance by age. Gut. 73(6). 955–965. 8 indexed citations
5.
Oyama, Hiroki, Yoshikuni Kawaguchi, Ryunosuke Hakuta, et al.. (2024). Older Age as a Worrisome Feature in Patients With Intraductal Papillary Mucinous Neoplasms: A Long-Term Surveillance Study. The American Journal of Gastroenterology. 120(2). 449–458. 3 indexed citations
6.
Saito, Kei, Yousuke Nakai, Takashi Sasaki, et al.. (2024). Impact of Statin Use on Survival in Patients With Unresectable Pancreatic cancer Receiving Gemcitabine Plus Nab-Paclitaxel. Pancreas. 54(2). e107–e113. 1 indexed citations
7.
Ouchida, Jun, Hiroaki Nakashima, Tokumi Kanemura, et al.. (2024). Analysis of spinopelvic parameters in adult patients with lumbosacral transitional vertebrae. European Spine Journal. 33(8). 2952–2959. 2 indexed citations
8.
Hamada, Tsuyoshi, Hiroki Oyama, Ryunosuke Hakuta, et al.. (2024). The Revised Kyoto Criteria and Risk of Malignancy Among Patients With Intraductal Papillary Mucinous Neoplasms. Clinical Gastroenterology and Hepatology. 22(12). 2413–2423.e18. 7 indexed citations
9.
Hamada, Tsuyoshi, Koichiro Yasaka, Yousuke Nakai, et al.. (2024). Computed tomography-based prediction of pancreatitis following biliary metal stent placement with the convolutional neural network. SHILAP Revista de lepidopterología. 12(6). E772–E780. 2 indexed citations
10.
Hakuta, Ryunosuke, Tatsuya Sato, Yousuke Nakai, et al.. (2024). Balloon endoscopy-assisted endoscopic retrograde cholangiopancreatography for hepatolithiasis in patients with hepaticojejunostomy. Surgical Endoscopy. 38(5). 2423–2432. 2 indexed citations
11.
Hamada, Tsuyoshi, Naminatsu Takahara, Kei Saito, et al.. (2024). Skeletal muscle status and survival among patients with advanced biliary tract cancer. International Journal of Clinical Oncology. 29(3). 297–308. 2 indexed citations
12.
Seimiya, Takahiro, Tatsunori Suzuki, Takahiro Kishikawa, et al.. (2023). Combination of serum human satellite RNA and miR-21-5p levels as a biomarker for pancreatic cancer. iScience. 26(2). 106021–106021. 5 indexed citations
13.
Hakuta, Ryunosuke, Yousuke Nakai, Tsuyoshi Hamada, et al.. (2023). Development and external validation of a nomogram for prediction of post-endoscopic retrograde cholangiopancreatography pancreatitis. Pancreatology. 23(7). 789–796. 6 indexed citations
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Ishigaki, Kazunaga, Yousuke Nakai, Hiroki Oyama, et al.. (2020). Endoscopic Ultrasound-Guided Tissue Acquisition by 22-Gauge Franseen and Standard Needles for Solid Pancreatic Lesions. Gut and Liver. 14(6). 817–825. 20 indexed citations
16.
Nakai, Yousuke, Hiroki Oyama, Sachiko Kanai, et al.. (2020). Double Guidewire Technique Using an Uneven Double Lumen Catheter for Endoscopic Ultrasound-Guided Interventions. Digestive Diseases and Sciences. 66(5). 1540–1547. 17 indexed citations
17.
Ishigaki, Kazunaga, Tsuyoshi Hamada, Yousuke Nakai, et al.. (2020). Lenvatinib-induced acute acalculous cholecystitis in a patient with hepatocellular carcinoma. Clinical Journal of Gastroenterology. 13(4). 568–571. 5 indexed citations
18.
Hakuta, Ryunosuke, Tsuyoshi Hamada, Yousuke Nakai, et al.. (2019). Natural history of asymptomatic bile duct stones and association of endoscopic treatment with clinical outcomes. Journal of Gastroenterology. 55(1). 78–85. 34 indexed citations
19.
Takahara, Naminatsu, Yousuke Nakai, Hiroyuki Isayama, et al.. (2018). Second-line chemotherapy in patients with advanced or recurrent biliary tract cancer: a single center, retrospective analysis of 294 cases. Investigational New Drugs. 36(6). 1093–1102. 13 indexed citations
20.
Shimokawa, Shinji, et al.. (2004). The Figure-L Unilateral Mini-Sternotomy for Anterior Mediastinal Tumor. The Thoracic and Cardiovascular Surgeon. 52(1). 54–56. 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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