Keiichi Maruyama

4.8k total citations · 2 hit papers
72 papers, 3.8k citations indexed

About

Keiichi Maruyama is a scholar working on Pulmonary and Respiratory Medicine, Surgery and Gastroenterology. According to data from OpenAlex, Keiichi Maruyama has authored 72 papers receiving a total of 3.8k indexed citations (citations by other indexed papers that have themselves been cited), including 60 papers in Pulmonary and Respiratory Medicine, 37 papers in Surgery and 20 papers in Gastroenterology. Recurrent topics in Keiichi Maruyama's work include Gastric Cancer Management and Outcomes (54 papers), Metastasis and carcinoma case studies (27 papers) and Gastrointestinal Tumor Research and Treatment (19 papers). Keiichi Maruyama is often cited by papers focused on Gastric Cancer Management and Outcomes (54 papers), Metastasis and carcinoma case studies (27 papers) and Gastrointestinal Tumor Research and Treatment (19 papers). Keiichi Maruyama collaborates with scholars based in Japan, United States and United Kingdom. Keiichi Maruyama's co-authors include Taira Kinoshitá, Mitsuru Sasako, Kenzo Okabayashi, Hitoshi Katai, Takeshi Sano, Peter McCulloch, Peter Gunvén, M. Sasako, Kan Okabayashi and Cornelis J.�H. van de Velde and has published in prestigious journals such as Cancer, Annals of Surgery and British Journal of Cancer.

In The Last Decade

Keiichi Maruyama

71 papers receiving 3.6k 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.

Progress in gastric cancer surgery in Japan and its limits of radicality

1987 534 citations Keiichi Maruyama, Kenzo Okabayashi et al. profile →
Lymph Node Metastases of Gastric Cancer

1989 361 citations Keiichi Maruyama, Kenzo Okabayashi et al. profile →

Peers

Keiichi Maruyama

PRM

SURGE

GASTR

ONCOL

Ilfet Songun Netherlands

Kuniyoshi Arai Japan

Shinichi Sakuramoto Japan

Hiroshi Yabusaki Japan

Jeong Hwan Yook South Korea

Chizu Yokoi Japan

Leon M.G. Moons Netherlands

Xin‐Zu Chen China

Tsuyoshi Etoh Japan

Prateek Sharma United States

Ilfet Songun Netherlands

Keiichi Maruyama

4.2k ×1.3

PRM

2.2k ×1.3

SURGE

2.4k ×1.5

GASTR

777 ×1.0

ONCOL

142 ×0.9

Citations per year, relative to Keiichi Maruyama Keiichi Maruyama (= 1×) peers Ilfet Songun

Countries citing papers authored by Keiichi Maruyama

Since Specialization

Citations

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

Fields of papers citing papers by Keiichi Maruyama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Keiichi Maruyama

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

Fukagawa, Takeo, Mitsuru Sasako, G. Bruce Mann, et al.. (2001). Immunohistochemically detected micrometastases of the lymph nodes in patients with gastric carcinoma. Cancer. 92(4). 753–760. 95 indexed citations

Sano, Takeshi, Hitoshi Katai, Mitsuru Sasako, & Keiichi Maruyama. (2000). Gastric Lymphography and Detection of Sentinel Nodes. Recent results in cancer research. 157. 253–258. 36 indexed citations

Sano, Takeshi, Hitoshi Katai, Mitsuru Sasako, & Keiichi Maruyama. (2000). The management of early gastric cancer. Surgical Oncology. 9(1). 17–22. 32 indexed citations

Nomura, Sachiyo, Mitsuru Sasako, Hitoshi Katai, Takeshi Sano, & Keiichi Maruyama. (2000). Decreasing complication rates with stapled esophagojejunostomy following a learning curve. Gastric Cancer. 3(2). 97–101. 60 indexed citations

Katai, Hitoshi, Mitsuru Sasako, Takaaki Sano, & Keiichi Maruyama. (1998). The Outcome of Surgical Treatment for Gastric Carcinoma in the Elderly. Japanese Journal of Clinical Oncology. 28(2). 112–115. 67 indexed citations

Takenaka, T, Keiichi Maruyama, Taira Kinoshitá, et al.. (1997). A prospective study of surgery and adjuvant chemotherapy for primary gastric lymphoma stage II. British Journal of Cancer. 76(11). 1484–1488. 9 indexed citations

Sano, Takeshi, Mitsuru Sasako, Taira Kinoshitá, et al.. (1997). Total gastrectomy for primary gastric lymphoma at stages IE and IIE: A prospective study of fifty cases. Surgery. 121(5). 501–505. 17 indexed citations

Katai, Hitoshi, Mitsuru Sasako, Takeshi Sano, & Keiichi Maruyama. (1996). Gastric Carcinoma in Young Adults. Japanese Journal of Clinical Oncology. 26(3). 139–143. 29 indexed citations

Sano, Tetsuro, Kuniaki Shirao, Hiroyuki Ono, et al.. (1996). A Case of Bone Marrow Recurrence from Gastric Carcinoma after a Nine-year Disease-free Interval. Japanese Journal of Clinical Oncology. 26(6). 472–475. 19 indexed citations

10.

Katai, Hitoshi, Keiichi Maruyama, Takeshi Sano, Mitsuru Sasako, & Kiyoshi Miwa. (1995). TREATMENT RESULTS OF GASTRIC CANCER PATIENTS : AN ANALYSIS OF NATIONWIDE DATABASE. 43. 47–56. 3 indexed citations

11.

Guadagni, Stefano, Letizia Marsili, Marco Catarci, et al.. (1995). Arterial vasculature of the stomach and oncologic gastrectomies. Surgical and Radiologic Anatomy. 17(3). 269–276. 8 indexed citations

12.

Endo, Masato, Keiichi Maruyama, Taira Kinoshitá, & Mitsuru Sasako. (1994). Chylous Ascites after Extended Lymphnode Dissection for Gastric Cancer.. The Japanese Journal of Gastroenterological Surgery. 27(4). 917–921. 7 indexed citations

13.

Uchino, Shinya, Hitoshi Tsuda, Keiichi Maruyama, et al.. (1993). Overexpression of c‐ erb B‐2 protein in gastric cancer. Its correlation with long‐term survival of patients. Cancer. 72(11). 3179–3184. 114 indexed citations

14.

Sano, Takeshi, Mitsuru Sasako, Taira Kinoshitá, & Keiichi Maruyama. (1993). Recurrence of early gastric cancer. Follow-up of 1475 patients and review of the Japanese literature. Cancer. 72(11). 3174–3178. 265 indexed citations

15.

Kinoshitá, Taira, et al.. (1992). A Comparison of Distal Pancreatectomy and the Cancreas-preserving Operation for Advanced Gastric Cancer in Regard to the Quality of Life of the Patients and the Treatment Results.. The Japanese Journal of Gastroenterological Surgery. 25(10). 2618–2623. 3 indexed citations

16.

Yamaguchi, Naohito, Shaw Watanabe, Keiichi Maruyama, & Toshiteru Okubo. (1990). Analysis of Stomach Cancer Incidence by Histologic Subtypes Based on a Mathematical Model of Multistage Cancer Induction and Exponential Growth. Japanese Journal of Cancer Research. 81(11). 1109–1117. 4 indexed citations

17.

Sasako, Mitsuru, Taira Kinoshitá, Keiichi Maruyama, et al.. (1989). Surgical treatment for gastric leiomyosarcoma clinicopathological study of 51 resected cases.. The Japanese Journal of Gastroenterological Surgery. 22(9). 2212–2216. 5 indexed citations

18.

Maruyama, Keiichi, et al.. (1980). Effects of 1-Hexylcarbamoyl-5-fluorouracil (HCFU) and Its Metabolites on Bladder Movement. Rinsho yakuri/Japanese Journal of Clinical Pharmacology and Therapeutics. 11(1). 27–36. 2 indexed citations

19.

Maruyama, Keiichi. (1979). A NEW DISSECTION TECHNIQUE OF SUPERIOR PANCREATIC LYMPH NODES. The Japanese Journal of Gastroenterological Surgery. 12(12). 961–965. 14 indexed citations

20.

Maruyama, Keiichi, Kiyoshi Miwa, Masaki Kitajima, et al.. (1974). PREVENTION OF LEAKAGE OF GASTRO-INTESTINAL ANASTOMOSIS PRINCIPLES OBTAIND FROM PATHOLOGIC, MICROAMGIRAPHIC AND BIOCHEMICAL STUDIES. The Japanese Journal of Gastroenterological Surgery. 7(1). 18–25. 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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