Shigemasa Koga
- Gastroenterology top 1%
- Gastrointestinal Tumor Research and Treatment 13
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- Gastric Cancer Management and Outcomes 36
- Metastasis and carcinoma case studies 24
- Surgery top 5%
- Helicobacter pylori-related gastroenterology studies 11
- Pediatric Hepatobiliary Diseases and Treatments 7
- Cholangiocarcinoma and Gallbladder Cancer Studies 7
- Esophageal and GI Pathology 7
- Oncology top 10%
- Reproductive Medicine top 10%
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- Ultrasound and Hyperthermia Applications 8
Shigemasa Koga
87 papers receiving 1.6k citations
Peers
Comparison fields: 5 of 101
- Gastroenterology 339
- Pulmonary and Respiratory Medicine 839
- Surgery 787
- Oncology 423
- Reproductive Medicine 85
Countries citing papers authored by Shigemasa Koga
This map shows the geographic impact of Shigemasa Koga'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 Shigemasa Koga with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Shigemasa Koga more than expected).
Fields of papers citing papers by Shigemasa Koga
This network shows the impact of papers produced by Shigemasa Koga. 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 Shigemasa Koga. The network helps show where Shigemasa Koga may publish in the future.
Co-authorship network
The 25 scholars most cited alongside Shigemasa Koga, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.
All Works
| # | Work | ||
|---|---|---|---|
| 1 | 1991 | 7 | |
| 2 | 1990 | 56 | |
| 3 | 1990 | 7 | |
| 4 | 1990 | 11 | |
| 5 | 1989 | 0 | |
| 6 | 1989 | 2 | |
| 7 | 1988 | 4 | |
| 8 | 1988 | 16 | |
| 9 | 1988 | 3 | |
| 10 | 1988 | 19 | |
| 11 | 1987 | 1 | |
| 12 | 1987 | 7 | |
| 13 | 1987 | 9 | |
| 14 | 1987 | 2 | |
| 15 | 1987 | 58 | |
| 16 | Carcinoembryonic antigen in gastric cancer patients -prognostic value of preoperative serum cea level and predictor of response to chemotherapy- | 1984 | 1 |
| 17 | 1984 | 3 | |
| 18 | 1983 | 24 | |
| 19 | 1979 | 2 | |
| 20 | 1978 | 6 |
About Shigemasa Koga
Shigemasa Koga is a scholar working on Gastroenterology, Pulmonary and Respiratory Medicine and Surgery, having authored 92 papers that have together received 1.6k indexed citations. Recurring topics across this work include Gastric Cancer Management and Outcomes (36 papers), Metastasis and carcinoma case studies (24 papers), Gastrointestinal Tumor Research and Treatment (13 papers), Helicobacter pylori-related gastroenterology studies (11 papers), Ultrasound and Hyperthermia Applications (8 papers), Pediatric Hepatobiliary Diseases and Treatments (7 papers), Cholangiocarcinoma and Gallbladder Cancer Studies (7 papers) and Esophageal and GI Pathology (7 papers). The work is most often cited by research in Gastroenterology (339 citations), Pulmonary and Respiratory Medicine (839 citations) and Surgery (787 citations). Shigemasa Koga has collaborated with scholars based in Japan and Pakistan. Frequent co-authors include Nobuaki Kaibara, Hideaki Nishidoi, Michio Maeta, Osamu Kimura, Yasuo IITSUKA, Ryuichi Hamazoe, Norio Shimizu, Hiroyuki Kishimoto, Takashi Takeuchi and Yukio Osaki. Their work appears in journals such as Cancer, The American Journal of Surgery and Diseases of the Colon & Rectum.
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.