Hirochika Toyama

2.7k total citations
155 papers, 1.6k citations indexed

About

Hirochika Toyama is a scholar working on Oncology, Surgery and Pulmonary and Respiratory Medicine. According to data from OpenAlex, Hirochika Toyama has authored 155 papers receiving a total of 1.6k indexed citations (citations by other indexed papers that have themselves been cited), including 90 papers in Oncology, 84 papers in Surgery and 50 papers in Pulmonary and Respiratory Medicine. Recurrent topics in Hirochika Toyama's work include Pancreatic and Hepatic Oncology Research (80 papers), Hepatocellular Carcinoma Treatment and Prognosis (40 papers) and Cholangiocarcinoma and Gallbladder Cancer Studies (26 papers). Hirochika Toyama is often cited by papers focused on Pancreatic and Hepatic Oncology Research (80 papers), Hepatocellular Carcinoma Treatment and Prognosis (40 papers) and Cholangiocarcinoma and Gallbladder Cancer Studies (26 papers). Hirochika Toyama collaborates with scholars based in Japan, United States and United Kingdom. Hirochika Toyama's co-authors include Takumi Fukumoto, Yoshikazu Kuroda, Tetsuo Ajiki, Seiji Okada, Hirohito Ichii, Masahiko Hatano, Masahiro Kido, Yonson Ku, Ippei Matsumoto and Makoto Shinzeki and has published in prestigious journals such as Journal of Clinical Oncology, Immunity and Nature Immunology.

In The Last Decade

Hirochika Toyama

133 papers receiving 1.6k citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Hirochika Toyama Japan	19	756	639	401	339	227	155	1.6k
Dalibor Antolovic Germany	22	782 1.0×	522 0.8×	271 0.7×	278 0.8×	80 0.4×	41	1.5k
Masahiro Ohira Japan	22	572 0.8×	491 0.8×	561 1.4×	306 0.9×	358 1.6×	185	2.0k
Jieer Ying China	18	850 1.1×	430 0.7×	175 0.4×	532 1.6×	196 0.9×	95	1.7k
Elena Magni Italy	18	558 0.7×	261 0.4×	160 0.4×	292 0.9×	227 1.0×	43	1.2k
Jeong Kim South Korea	17	335 0.4×	418 0.7×	234 0.6×	208 0.6×	134 0.6×	56	1.2k
Takeyuki Misawa Japan	25	1.1k 1.4×	931 1.5×	169 0.4×	514 1.5×	216 1.0×	168	1.9k
Zhi Peng China	26	1.3k 1.7×	434 0.7×	284 0.7×	669 2.0×	223 1.0×	106	2.1k
Masahiro Kido Japan	23	391 0.5×	812 1.3×	309 0.8×	338 1.0×	496 2.2×	153	1.9k
Toru Nakamura Japan	23	1.1k 1.5×	993 1.6×	254 0.6×	722 2.1×	167 0.7×	138	2.0k

Countries citing papers authored by Hirochika Toyama

Since Specialization

Citations

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

Fields of papers citing papers by Hirochika Toyama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Hirochika Toyama

This figure shows the co-authorship network connecting the top 25 collaborators of Hirochika Toyama. A scholar is included among the top collaborators of Hirochika Toyama 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 Hirochika Toyama. Hirochika Toyama is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Unno, Michiaki, Fuyuhiko Motoi, Yutaka Matsuyama, et al.. (2025). Neoadjuvant Chemotherapy With Gemcitabine and S-1 Versus Upfront Surgery for Resectable Pancreatic Cancer. Annals of Surgery. 283(1). 57–64. 7 indexed citations

Mizumoto, Takuya, Hirochika Toyama, Yoshihide Nanno, et al.. (2025). Utility of postoperative plasma D-Dimer testing for early prediction of venous thromboembolism after pancreatectomy: A retrospective study. Asian Journal of Surgery. 49(1). 90–97.

Sofue, Keitaro, Eisuke Ueshima, Naoki Sugiyama, et al.. (2024). Rim Enhancement on Contrast-Enhanced CT as a Predictor of Prognosis in Patients with Pancreatic Ductal Adenocarcinoma. Diagnostics. 14(8). 782–782. 1 indexed citations

Nanno, Yoshihide, Hirochika Toyama, Kazuyuki Nagai, et al.. (2024). Endoscopic ultrasound‐guided tissue acquisition allows a reliable proliferation assessment of small (≤20 mm) pancreatic neuroendocrine tumors. Annals of Gastroenterological Surgery. 9(2). 339–346.

Komatsu, Shohei, Keitaro Sofue, Eisuke Ueshima, et al.. (2024). Association between tumor morphology and efficacy of atezolizumab plus bevacizumab for advanced hepatocellular carcinoma. Hepatology Research. 54(8). 773–780. 5 indexed citations

Terashima, Kazuki, Jun Ishida, Yoshihide Nanno, et al.. (2023). Proton radiotherapy as a treatment strategy to increase survival in locally advanced pancreatic cancer in the body and tail: a retrospective study. Radiation Oncology. 18(1). 131–131. 1 indexed citations

Komatsu, Shohei, Kazuki Terashima, Yusuke Demizu, et al.. (2023). Clinical impact of spacer placement surgery with expanded polytetrafluoroethylene sheet for particle therapy. Radiation Oncology. 18(1). 173–173. 1 indexed citations

Yanagimoto, Hiroaki, Daisuke Tsugawa, Masayuki Akita, et al.. (2023). Prognostic Impact of Malnutrition Diagnosed by the GLIM Criteria for Resected Extrahepatic Cholangiocarcinoma. Anticancer Research. 43(5). 2299–2308. 2 indexed citations

Toyama, Hirochika, et al.. (2023). Laparoscopic Necrosectomy for walled‐off necrosis following necrotizing pancreatitis. Pediatrics International. 65(1). e15569–e15569.

10.

Ishida, Jun, Hirochika Toyama, Sadaki Asari, et al.. (2022). Use of a short cartridge stapler is beneficial in pancreatic transection at the neck during laparoscopic distal pancreatectomy. Surgery Today. 53(1). 153–157. 1 indexed citations

11.

Komatsu, Shohei, Kazuomi Ueshima, Masahiro Kido, et al.. (2022). Hepatectomy versus sorafenib for advanced hepatocellular carcinoma with macroscopic portal vein tumor thrombus: A bi‐institutional propensity‐matched cohort study. Journal of Hepato-Biliary-Pancreatic Sciences. 30(3). 303–314. 8 indexed citations

12.

Ishida, Jun, Hirochika Toyama, & Takumi Fukumoto. (2021). Portal vein tumor thrombosis after pancreaticoduodenectomy: An extremely rare case of recurrence of pancreatic neuroendocrine neoplasm. Journal of Hepato-Biliary-Pancreatic Sciences. 28(8). e36–e37.

13.

Gon, Hidetoshi, Shohei Komatsu, Masahiro Kido, et al.. (2019). Real-time navigation during hepatectomy using fusion indocyanine green-fluorescence imaging: protocol for a prospective cohort study. BMJ Open. 9(8). e030233–e030233. 6 indexed citations

14.

Ishida, Jun, Hirochika Toyama, Daisuke Tsugawa, Masahiro Kido, & Takumi Fukumoto. (2019). Two‐in‐one method: Novel pancreaticojejunostomy technique for the bifid pancreas. Annals of Gastroenterological Surgery. 4(2). 175–179. 4 indexed citations

15.

Tanaka, Motofumi, Masahiro Kido, Kaori Kuramitsu, et al.. (2019). Efficacy of the bile leak test using contrast-enhanced intraoperative ultrasonic cholangiography in liver resection: a study protocol for a non-randomised, prospective, off-label, single-arm trial. BMJ Open. 9(6). e029330–e029330. 3 indexed citations

16.

Gon, Hidetoshi, Masahiro Kido, Motofumi Tanaka, et al.. (2018). Growth velocity of the portal vein tumor thrombus accelerated by its progression, alpha-fetoprotein level, and liver fibrosis stage in patients with hepatocellular carcinoma. Surgery. 164(5). 1014–1022. 13 indexed citations

17.

Ueda, Yuki, et al.. (2018). Prognosis of Patients with Neuroendocrine Neoplasms of the Pancreas According to the World Health Organization 2017 Classification. JOP, journal of the pancreas. 4 indexed citations

18.

Shinzeki, Makoto, Yuichi Hori, Ippei Matsumoto, et al.. (2011). Endoscopic Sphincterotomy for Lemmel Syndrome presenting with Severe Acute Pancreatitis : A Case Report. The Japanese Journal of Gastroenterological Surgery. 44(2). 123–130.

19.

Matsumoto, Ippei, Makoto Shinzeki, Hirochika Toyama, et al.. (2011). Pancreas preservation for pancreas and islet transplantation. Suizo. 26(2). 142–152.

20.

Shirakawa, Sachiyo, Hirochika Toyama, Makoto Shinzeki, et al.. (2010). Successful Management of Ruptured Pseudoaneurysm of Superior Mesenteric Artery (SMA) after Pancreatoduodenectomy by SMA-iliac Artery Bypass Grafting; Report of A Case. The Japanese Journal of Gastroenterological Surgery. 43(5). 548–553. 1 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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