Koji Asai

4.9k total citations
49 papers, 379 citations indexed

About

Koji Asai is a scholar working on Surgery, Pulmonary and Respiratory Medicine and Oncology. According to data from OpenAlex, Koji Asai has authored 49 papers receiving a total of 379 indexed citations (citations by other indexed papers that have themselves been cited), including 29 papers in Surgery, 23 papers in Pulmonary and Respiratory Medicine and 22 papers in Oncology. Recurrent topics in Koji Asai's work include Pancreatic and Hepatic Oncology Research (12 papers), Gallbladder and Bile Duct Disorders (10 papers) and Colorectal Cancer Surgical Treatments (5 papers). Koji Asai is often cited by papers focused on Pancreatic and Hepatic Oncology Research (12 papers), Gallbladder and Bile Duct Disorders (10 papers) and Colorectal Cancer Surgical Treatments (5 papers). Koji Asai collaborates with scholars based in Japan and United States. Koji Asai's co-authors include Shinya Kusachi, Yoshihisa Saida, Toshiyuki Enomoto, Hiroshi Matsukiyo, Tomoaki Saito, Yoichi Nakamura, Manabu Watanabe, Yasushi Okamoto, Jirō Nagao and Manabu Watanabe and has published in prestigious journals such as Frontiers in Microbiology, Surgical Endoscopy and Pathology International.

In The Last Decade

Koji Asai

38 papers receiving 359 citations

Peers

Koji Asai

SURGE

PRM

ONCOL

EPIDE

Helmut Alfredo Segovia Lohse Paraguay

Koray Atila Türkiye

J.A. Álvarez Pérez Spain

Pier Giorgio Rabitti Italy

Timothy Gardner United States

Narendra Dhaka India

Eugene Golts United States

Edgar D. Sy Taiwan

Bahjat Barakat Italy

Juan Mier Mexico

Helmut Alfredo Segovia Lohse Paraguay

Koji Asai

515 ×2.3

SURGE

127 ×0.7

PRM

299 ×2.0

ONCOL

91 ×1.1

72 ×1.9

EPIDE

Citations per year, relative to Koji Asai Koji Asai (= 1×) peers Helmut Alfredo Segovia Lohse

Countries citing papers authored by Koji Asai

Since Specialization

Citations

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

Fields of papers citing papers by Koji Asai

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Koji Asai

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

Asai, Koji, Makoto Kuroda, Osahiko Hagiwara, et al.. (2025). Multiplex PCR-based rapid pathogen identification in acute cholecystitis using the FilmArray BCID2 panel. Frontiers in Microbiology. 16. 1687205–1687205.

Asai, Koji, et al.. (2023). Validation of a surgical difficulty grading system in laparoscopic cholecystectomy for acute cholecystitis. Journal of Hepato-Biliary-Pancreatic Sciences. 31(2). 80–88. 1 indexed citations

Asai, Koji, et al.. (2023). Rapid identification of bacteria using a multiplex polymerase chain reaction system for acute abdominal infections. Frontiers in Microbiology. 14. 1220651–1220651. 9 indexed citations

Endo, Yuichi, Tatsushi Tokuyasu, Yasuhisa Mori, et al.. (2023). Impact of AI system on recognition for anatomical landmarks related to reducing bile duct injury during laparoscopic cholecystectomy. Surgical Endoscopy. 37(7). 5752–5759. 17 indexed citations

Shirai, Yoko, Yasunori Enomoto, Koji Asai, et al.. (2017). Solid pseudopapillary neoplasm expresses inhibin‐α and Tcf‐3. Pathology International. 67(4). 228–229.

Enomoto, Toshiyuki, Yoshihisa Saida, Ryohei Watanabe, et al.. (2016). Open surgery versus laparoscopic surgery after stent insertion for obstructive colorectal cancer. Surgery Today. 46(12). 1383–1386. 18 indexed citations

Nakamura, Yoichi, Ryohei Watanabe, Yoshihisa Saida, et al.. (2016). Neutrophil/lymphocyte ratio has a prognostic value for patients with terminal cancer. World Journal of Surgical Oncology. 14(1). 148–148. 21 indexed citations

Asai, Koji, Manabu Watanabe, Shinya Kusachi, et al.. (2014). Risk factors for conversion of laparoscopic cholecystectomy to open surgery associated with the severity characteristics according to the Tokyo guidelines. Surgery Today. 44(12). 2300–2304. 53 indexed citations

Matsukiyo, Hiroshi, Manabu Watanabe, Koji Asai, et al.. (2013). A case of liver metastasis of rectal cancer with intrabiliary tumor growth required differentiation from intrahepatic cholangiocarcinoma. Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association). 74(2). 493–497. 1 indexed citations

10.

Okuda, J., Keitaro Tanaka, Keisaku Kondo, et al.. (2011). Safe anastomosis in laparoscopic low anterior resection for rectal cancer. Asian Journal of Endoscopic Surgery. 4(2). 68–72. 17 indexed citations

11.

Kusachi, Shinya, Jirō Nagao, Yoshihisa Saida, et al.. (2011). Twenty years of countermeasures against postoperative methicillin-resistant Staphylococcus aureus infections. Surgery Today. 41(5). 630–636. 3 indexed citations

12.

Asai, Koji, Manabu Watanabe, Hiroshi Matsukiyo, et al.. (2011). Combined hepatic resection with the inferior vena cava and diaphragm and reconstruction using an equine pericardial patch: Report of a case. Surgery Today. 41(12). 1670–1673. 7 indexed citations

13.

Kusachi, Shinya, Jirō Nagao, Yoshihisa Saida, et al.. (2010). Antibiotic time-lag combination therapy with fosfomycin for postoperative intra-abdominal abscesses. Journal of Infection and Chemotherapy. 17(1). 91–96. 9 indexed citations

14.

Saito, Tomoaki, Manabu Watanabe, Hidenori Tanaka, et al.. (2009). Cholangiocellular Carcinoma Associated with Wilson's Disease. The Japanese Journal of Gastroenterological Surgery. 42(10). 1574–1579. 3 indexed citations

15.

Watanabe, Manabu, et al.. (2009). A CASE OF "SO-CALLED CARCINOSARCOMA OF THE GALLBLADDER" ASSOCIATED WITH ACUTE CHOLECYSTITIS. Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association). 70(5). 1491–1496. 3 indexed citations

16.

Asai, Koji, Yoshinobu Sumiyama, Manabu Watanabe, et al.. (2007). Multiple necrotic nodules of the liver simulating liver metastasis. Journal of Hepato-Biliary-Pancreatic Surgery. 14(4). 414–420. 2 indexed citations

17.

Asai, Koji, Yoshinobu Sumiyama, Manabu Watanabe, & Katsuo Aizawa. (2006). Tumor Viability Using Real-Time Spectral Images. Surgery Today. 36(12). 1075–1084. 7 indexed citations

18.

Asai, Koji, Seiji Igarashi, Takashi Matsui, Jun Horiguchi, & Kenjiro Kotake. (2003). Risk Factors of Lymph Node Metastasis in Colorectal Cancer, Invading to Submucosal Layer. The Japanese Journal of Gastroenterological Surgery. 36(10). 1365–1369. 2 indexed citations

19.

Asai, Koji, et al.. (2003). A Case of Rapidly Enlarged G-CSF Producing Esophageal So-called Carcinosacoma Showing a Variety of Lesions. The Japanese Journal of Gastroenterological Surgery. 36(6). 464–469. 10 indexed citations

20.

Saida, Yoshihisa, Yoichi Nakamura, Yasushi Nakamura, et al.. (2001). Omental Cyst: Report of a Case. Surgery Today. 31(12). 1104–1106. 16 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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