Kunio Okajima

4.6k total citations · 3 hit papers
82 papers, 3.3k citations indexed

About

Kunio Okajima is a scholar working on Pulmonary and Respiratory Medicine, Surgery and Gastroenterology. According to data from OpenAlex, Kunio Okajima has authored 82 papers receiving a total of 3.3k indexed citations (citations by other indexed papers that have themselves been cited), including 53 papers in Pulmonary and Respiratory Medicine, 40 papers in Surgery and 26 papers in Gastroenterology. Recurrent topics in Kunio Okajima's work include Gastric Cancer Management and Outcomes (40 papers), Metastasis and carcinoma case studies (32 papers) and Gastrointestinal Tumor Research and Treatment (24 papers). Kunio Okajima is often cited by papers focused on Gastric Cancer Management and Outcomes (40 papers), Metastasis and carcinoma case studies (32 papers) and Gastrointestinal Tumor Research and Treatment (24 papers). Kunio Okajima collaborates with scholars based in Japan, United States and Austria. Kunio Okajima's co-authors include Mitsuo Narusue, Katsusuke Tabuchi, Takuji Todani, Yasuhiro Watanabe, Hiroshi Isozaki, Yoshitaka Yamamura, Mitsuru Sasako, Masahiro Hiratsuka, Akira Kurita and Atsushi Nashimoto and has published in prestigious journals such as New England Journal of Medicine, Journal of Clinical Oncology and Cancer.

In The Last Decade

Kunio Okajima

77 papers receiving 3.2k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Congenital bile duct cysts

1977 907 citations Kunio Okajima et al. profile →
D2 Lymphadenectomy Alone or with Para-aortic Nodal Dissection for Gastric Cancer

2008 747 citations Kunio Okajima et al. profile →
Gastric Cancer Surgery: Morbidity and Mortality Results From a Prospective Randomized Controlled Trial Comparing D2 and Extended Para-Aortic Lymphadenectomy—Japan Clinical Oncology Group Study 9501

2004 532 citations Kunio Okajima et al. profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Kunio Okajima Japan	19	2.8k	2.0k	1.1k	474	129	82	3.3k
Natsuya Katada Japan	29	1.5k 0.6×	1.6k 0.8×	1.2k 1.1×	381 0.8×	359 2.8×	105	2.6k
Paolo Morgagni Italy	27	2.2k 0.8×	1.3k 0.6×	999 0.9×	389 0.8×	132 1.0×	76	2.5k
Grant Fullarton United Kingdom	22	947 0.3×	1.5k 0.7×	435 0.4×	385 0.8×	109 0.8×	57	1.8k
Adriana Vaz Safatle‐Ribeiro Brazil	21	833 0.3×	1.0k 0.5×	455 0.4×	443 0.9×	148 1.1×	120	1.6k
Byung Moo Yoo South Korea	27	1.3k 0.5×	1.5k 0.7×	171 0.2×	843 1.8×	76 0.6×	98	1.9k
Shoichi Fujii Japan	25	755 0.3×	1.1k 0.5×	261 0.2×	1.1k 2.4×	85 0.7×	101	1.8k
J F Botet United States	15	768 0.3×	685 0.3×	197 0.2×	575 1.2×	79 0.6×	23	1.4k
Tadashi Nishimaki Japan	24	1.4k 0.5×	1.5k 0.7×	184 0.2×	548 1.2×	240 1.9×	105	2.2k
Pauline Afchain France	17	578 0.2×	637 0.3×	674 0.6×	689 1.5×	56 0.4×	53	1.6k
Jae Chul Hwang South Korea	22	908 0.3×	988 0.5×	228 0.2×	514 1.1×	70 0.5×	90	1.4k

Countries citing papers authored by Kunio Okajima

Since Specialization

Citations

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

Fields of papers citing papers by Kunio Okajima

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Kunio Okajima

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

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Okajima, Kunio, et al.. (2006). Usefulness of preoperative FDG-PET for detection of gastric cancer. Gastric Cancer. 9(3). 192–196. 127 indexed citations

Takahashi, Yutaka, Junichi Sakamoto, Masayoshi Mai, et al.. (2003). The usefulness of CEA and/or CA19-9 in monitoring for recurrence in gastric cancer patients: a prospective clinical study. Gastric Cancer. 6(3). 142–145. 117 indexed citations

Fujii, Keizo, Kunio Okajima, Hiroshi Isozaki, et al.. (1998). A Clinicopathological Study on the Indications of Limited Surgery for Submucosal Gastric Cancer.. The Japanese Journal of Gastroenterological Surgery. 31(10). 2055–2062. 18 indexed citations

Ashida, Kiyoshi, et al.. (1997). Endocrine neoplasm arising from duodenal heterotopic pancreas: a case report. Gastrointestinal Endoscopy. 46(2). 172–176. 7 indexed citations

Isozaki, Hiroshi, et al.. (1997). Proliferating cell nuclear antigen expression in the gallbladder with pancreaticobiliary maljunction. Journal of Surgical Oncology. 65(1). 46–49. 8 indexed citations

Isozaki, Hiroshi, et al.. (1997). Distant lymph node metastasis of early gastric cancer. Surgery Today. 27(7). 600–605. 12 indexed citations

Hara, Hitoshi, Kunio Okajima, Hiroshi Isozaki, et al.. (1995). Two cases of cholecystolithiasis in children and review of 102 operated cases in Japan. 31(2). 225–230. 1 indexed citations

Hamamoto, Norihiro, Tetsuya Takashima, Takeshi Higashino, et al.. (1995). A CASE OF PANCREATIC LEIOYOSARCOMA. Acta gastro-enterologica belgica. 37(6). 1210–1215. 1 indexed citations

Okajima, Kunio, et al.. (1995). Clinical Evaluation of Preoperative Measurement of the Serum Human Hepatocyte Growth Factor Levels in Patients of Gastric Cancer.. The Japanese Journal of Gastroenterological Surgery. 28(11). 2139–2144. 1 indexed citations

10.

Isozaki, Hiroshi, et al.. (1995). Proximal subtotal gastrectomy for the treatment of carcinoma of the upper third of the stomach: Its indications based on lymph node metastasis and perigastric lymphatic flow. Surgery Today. 25(1). 21–26. 11 indexed citations

11.

Okajima, Kunio, Hiroshi Isozaki, Eiji Nakata, et al.. (1995). A CASE OF MALIGNANT LYMPHOMA IN THE RESIDUAL STOMACH. The journal of the Japanese Practical Surgeon Society. 56(9). 1838–1844. 1 indexed citations

12.

Hamamoto, Norihiro, Yutaro Egashira, Chikao Shimamoto, et al.. (1994). A CASE OF JUVENILE POLYPOSIS LOCALIZED IN THE STOMACH ACCOMPANIED BY GASTRIC CANCER. Acta gastro-enterologica belgica. 36(11).

13.

Isozaki, Hiroshi, et al.. (1994). The significance of Proliferating Cell Nuclear Antigen (PCNA) expression in cancer of the ampulla of vater in terms of prognosis. Surgery Today. 24(6). 494–499. 9 indexed citations

14.

Isozaki, Hiroshi, et al.. (1993). The successful surgical management of perforation after endoscopic sphincterotomy: Report of two cases. Surgery Today. 23(11). 1018–1022. 8 indexed citations

15.

Okajima, Kunio, et al.. (1992). Studies of Preoperative Imaging Diagnosis for the Assessment on the Lymph Node Metastasis of Gastric Cancer.. The Japanese Journal of Gastroenterological Surgery. 25(4). 1156–1160. 1 indexed citations

16.

Isozaki, Hiroshi, et al.. (1991). Optimum extent of lymph node dissection in the surgical treatment of gastric cancer accompanied by liver cirrhosis.. The Japanese Journal of Gastroenterological Surgery. 24(3). 798–804. 4 indexed citations

17.

Hara, Hitoshi, et al.. (1989). A case report of colon cancer with Crohn's disease.. The Japanese Journal of Gastroenterological Surgery. 22(8). 2130–2133. 1 indexed citations

18.

Okajima, Kunio, et al.. (1989). Clinico-pathological studies and indication of the operative procedures for advanced gastric cancer located in the lower third of stomach.. The Japanese Journal of Gastroenterological Surgery. 22(10). 2486–2489. 2 indexed citations

19.

Okajima, Kunio, et al.. (1987). [A case of focal nodular hyperplasia of the liver and review of previously reported 44 cases in Japan].. PubMed. 84(2). 302–6.

20.

Isozaki, Hiroshi, et al.. (1987). Retrospective analysis of the cases died of the recurrent gastric cancer.. The Japanese Journal of Gastroenterological Surgery. 20(9). 2097–2102. 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.

Explore authors with similar magnitude of impact