Keiichi Hatamaru

1.6k total citations
60 papers, 938 citations indexed

About

Keiichi Hatamaru is a scholar working on Surgery, Oncology and Pulmonary and Respiratory Medicine. According to data from OpenAlex, Keiichi Hatamaru has authored 60 papers receiving a total of 938 indexed citations (citations by other indexed papers that have themselves been cited), including 40 papers in Surgery, 36 papers in Oncology and 28 papers in Pulmonary and Respiratory Medicine. Recurrent topics in Keiichi Hatamaru's work include Pancreatic and Hepatic Oncology Research (34 papers), Gallbladder and Bile Duct Disorders (23 papers) and Hepatocellular Carcinoma Treatment and Prognosis (13 papers). Keiichi Hatamaru is often cited by papers focused on Pancreatic and Hepatic Oncology Research (34 papers), Gallbladder and Bile Duct Disorders (23 papers) and Hepatocellular Carcinoma Treatment and Prognosis (13 papers). Keiichi Hatamaru collaborates with scholars based in Japan. Keiichi Hatamaru's co-authors include Masayuki Kitano, Masahiro Itonaga, Takashi Tamura, Yasunobu Yamashita, Takeichi Yoshida, Yuki Kawaji, Hiroki Nishikawa, Sumio Saito, Tōru Kimura and Ryuichi Kita and has published in prestigious journals such as SHILAP Revista de lepidopterología, Medicine and World Journal of Gastroenterology.

In The Last Decade

Keiichi Hatamaru

58 papers receiving 918 citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Keiichi Hatamaru Japan	17	558	521	336	298	249	60	938
Yorihisa Sumida Japan	19	404 0.7×	597 1.1×	320 1.0×	233 0.8×	379 1.5×	111	1.0k
Koji Komeda Japan	22	540 1.0×	604 1.2×	372 1.1×	268 0.9×	637 2.6×	74	1.3k
Marcos V. Perini Australia	18	477 0.9×	567 1.1×	336 1.0×	147 0.5×	424 1.7×	97	1.2k
Yukio Iwashita Japan	20	536 1.0×	512 1.0×	289 0.9×	298 1.0×	478 1.9×	79	1.3k
Paolo Massucco Italy	16	709 1.3×	536 1.0×	351 1.0×	283 0.9×	347 1.4×	36	1.2k
Valentina Del Prete Italy	16	348 0.6×	260 0.5×	225 0.7×	233 0.8×	228 0.9×	28	749
Alessandro Valdegamberi Italy	18	667 1.2×	980 1.9×	568 1.7×	426 1.4×	567 2.3×	32	1.4k
Woohyung Lee South Korea	23	764 1.4×	953 1.8×	725 2.2×	156 0.5×	418 1.7×	126	1.5k
Masataka Kikuyama Japan	20	791 1.4×	860 1.7×	478 1.4×	319 1.1×	125 0.5×	89	1.4k
Hendrik A. Marsman Netherlands	19	464 0.8×	541 1.0×	217 0.6×	615 2.1×	465 1.9×	36	1.3k

Countries citing papers authored by Keiichi Hatamaru

Since Specialization

Citations

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

Fields of papers citing papers by Keiichi Hatamaru

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Keiichi Hatamaru

This figure shows the co-authorship network connecting the top 25 collaborators of Keiichi Hatamaru. A scholar is included among the top collaborators of Keiichi Hatamaru 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 Keiichi Hatamaru. Keiichi Hatamaru 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

Ogura, Takeshi, Hirotoshi Ishiwatari, Susumu Hijioka, et al.. (2024). Multicenter study comparing EUS‐guided hepaticogastrostomy and ERCP for malignant biliary obstruction in patients with accessible papillae. Journal of Hepato-Biliary-Pancreatic Sciences. 31(9). 680–687. 2 indexed citations

Yamashita, Yasunobu, Toshio Shimokawa, Tomohiro Tamura, et al.. (2024). Endoscopic ultrasonography for microvascular imaging without contrast enhancement in the differential diagnosis of pancreatic lesions. Digestive Endoscopy. 37(2). 192–198. 4 indexed citations

Itonaga, Masahiro, Reiko Ashida, Takashi Tamura, et al.. (2024). Impact of sarcopenia on recurrent biliary obstruction after EUS-guided biliary drainage in patients with malignant biliary obstruction. International Journal of Clinical Oncology. 29(3). 286–296. 1 indexed citations

Itonaga, Masahiro, Keiichi Hatamaru, Yasunobu Yamashita, et al.. (2024). Endoscopic ultrasound-guided hepaticogastrostomy vs. antegrade metal stent placement keeping an access route in patients with malignant biliary obstruction. International Journal of Clinical Oncology. 29(10). 1500–1508. 2 indexed citations

Yamashita, Yasunobu, Reiko Ashida, Fumiyoshi Kojima, et al.. (2023). Utility of contrast-enhanced harmonic endoscopic ultrasonography for prediction of pathological response after neoadjuvant chemotherapy in patients with pancreatic cancer. Pancreatology. 23(8). 1014–1019. 3 indexed citations

Yamashita, Yasunobu, Yuki Kawaji, Takashi Tamura, et al.. (2023). Utility of a partially covered metal stent for salvage sealing therapy for bleeding caused by duodenal invasion of pancreatobiliary cancers: Case series. SHILAP Revista de lepidopterología. 4(1). e253–e253.

Yamashita, Yasunobu, Yuki Kawaji, Toshio Shimokawa, et al.. (2022). Usefulness of Contrast-Enhanced Harmonic Endoscopic Ultrasonography for Diagnosis of Malignancy in Intraductal Papillary Mucinous Neoplasm. Diagnostics. 12(9). 2141–2141. 7 indexed citations

Yamashita, Yasunobu, Masahiro Itonaga, Yuki Kawaji, et al.. (2021). Usefulness of a newly designed laser-cut metal stent with an anchoring hook and thin delivery system for EUS-guided hepaticogastrostomy in experimental settings (with video). Gastrointestinal Endoscopy. 94(5). 999–1008.e1. 11 indexed citations

Yamashita, Yasunobu, Yuki Kawaji, Takashi Tamura, et al.. (2019). Utility of Elastography with Endoscopic Ultrasonography Shear-Wave Measurement for Diagnosing Chronic Pancreatitis. Gut and Liver. 14(5). 659–664. 41 indexed citations

10.

Kitano, Masayuki & Keiichi Hatamaru. (2019). EUS-guided biliary drainage for difficult cannulation. Endoscopic Ultrasound. 8(7). 67–67. 6 indexed citations

11.

Minaga, Kosuke, Tomoe Yoshikawa, Yukitaka Yamashita, et al.. (2019). Comparison of the Diagnostic Performance of Newly Designed 21-Gauge and Standard 22-Gauge Aspiration Needles in Patients with Solid Pancreatic Masses. Digestive Diseases and Sciences. 64(10). 2982–2991. 3 indexed citations

12.

Ogawa, Satoshi, Kosuke Minaga, Keiichi Hatamaru, et al.. (2017). The Feasibility of 18-mm-Diameter Colonic Stents for Obstructive Colorectal Cancers. Oncology. 93(Suppl. 1). 43–48. 5 indexed citations

13.

Ogura, Takeshi, Masayuki Kitano, Mamoru Takenaka, et al.. (2017). Multicenter prospective evaluation study of endoscopic ultrasound‐guided hepaticogastrostomy combined with antegrade stenting (with video). Digestive Endoscopy. 30(2). 252–259. 55 indexed citations

14.

Iwagami, Hiroyoshi, et al.. (2015). SUCCESSFUL ENDOSCOPIC ULTRASOUND-GUIDED RENDEZVOUS TECHNIQUE FOR A CASE OF MALIGNANT LOWER BILE DUCT OBSTRUCTION FOLLOWING BILLROTH II RECONSTRUCTION. Acta gastro-enterologica belgica. 57(1). 21–29. 1 indexed citations

15.

Takeda, Haruhiko, Yukio Osaki, Tadashi Inuzuka, et al.. (2012). Appropriateness and limitations of modified Response Evaluation Criteria in Solid Tumors (mRECIST) in evaluating the efficacy of molecular-targeted therapy for patients with hepatocellular carcinoma. Kanzo. 53(3). 147–154. 1 indexed citations

16.

Nishikawa, Hiroki, Eriko Iguchi, Tadashi Inuzuka, et al.. (2012). The effect of pegylated interferon-alpha2b and ribavirin combination therapy for chronic hepatitis C infection in elderly patients. BMC Research Notes. 5(1). 135–135. 20 indexed citations

17.

Nishikawa, Hiroki, Yukio Osaki, Eriko Iguchi, et al.. (2012). The Effect of Long-term Supplementation With Branched-chain Amino Acid Granules in Patients With Hepatitis C Virus-related Hepatocellular Carcinoma After Radiofrequency Thermal Ablation. Journal of Clinical Gastroenterology. 47(4). 359–366. 35 indexed citations

18.

Nishikawa, Hiroki, Yukio Osaki, Eriko Iguchi, et al.. (2012). Comparison of the efficacy of transcatheter arterial chemoembolization and sorafenib for advanced hepatocellular carcinoma. Experimental and Therapeutic Medicine. 4(3). 381–386. 14 indexed citations

19.

Nishikawa, Hiroki, Eriko Iguchi, Azusa Sakamoto, et al.. (2012). Impact of pretreatment serum cholinesterase level in unresectable advanced hepatocellular carcinoma patients treated with sorafenib. Molecular and Clinical Oncology. 1(2). 241–248. 19 indexed citations

20.

Nishikawa, Hiroki, Yukio Osaki, Eriko Iguchi, et al.. (2012). Radiofrequency ablation for hepatocellular carcinoma: the relationship between a new grading system for the ablative margin and clinical outcomes. Journal of Gastroenterology. 48(8). 951–965. 40 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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