Yoichi Ajioka

17.7k total citations · 3 hit papers
248 papers, 6.6k citations indexed

About

Yoichi Ajioka is a scholar working on Surgery, Oncology and Pulmonary and Respiratory Medicine. According to data from OpenAlex, Yoichi Ajioka has authored 248 papers receiving a total of 6.6k indexed citations (citations by other indexed papers that have themselves been cited), including 128 papers in Surgery, 117 papers in Oncology and 98 papers in Pulmonary and Respiratory Medicine. Recurrent topics in Yoichi Ajioka's work include Genetic factors in colorectal cancer (66 papers), Gastric Cancer Management and Outcomes (65 papers) and Cholangiocarcinoma and Gallbladder Cancer Studies (40 papers). Yoichi Ajioka is often cited by papers focused on Genetic factors in colorectal cancer (66 papers), Gastric Cancer Management and Outcomes (65 papers) and Cholangiocarcinoma and Gallbladder Cancer Studies (40 papers). Yoichi Ajioka collaborates with scholars based in Japan, United States and Australia. Yoichi Ajioka's co-authors include Hidenobu Watanabe, Katsuyoshi Hatakeyama, Jeremy R. Jass, Ken Nishikura, Toshifumi Wakai, Yoshio Shirai, Hajime Watanabe, Hiroyasu Iishi, Naohisa Yahagi and Mitsuhiro Fujishiro and has published in prestigious journals such as Journal of Clinical Oncology, SHILAP Revista de lepidopterología and The Journal of Immunology.

In The Last Decade

Yoichi Ajioka

225 papers receiving 6.5k 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.

Guidelines for endoscopic submucosal dissection and endoscopic mucosal resection for early gastric cancer

2015 389 citations Yoichi Ajioka et al. profile →
Guidelines for endoscopic submucosal dissection and endoscopic mucosal resection for early gastric cancer (second edition)

2020 264 citations Yoichi Ajioka et al. profile →
Japan Gastroenterological Endoscopy Society guidelines for colorectal endoscopic submucosal dissection/endoscopic mucosal resection

2019 252 citations Kenichi Sugihara, Yoichi Ajioka et al. profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Yoichi Ajioka Japan	44	3.5k	3.2k	3.1k	1.5k	1.0k	248	6.6k
Hidenobu Watanabe Japan	46	3.3k 1.0×	4.3k 1.3×	2.9k 0.9×	1.7k 1.1×	938 0.9×	192	7.0k
Amitabh Srivastava United States	38	2.2k 0.6×	1.8k 0.6×	2.6k 0.8×	993 0.7×	492 0.5×	123	4.7k
Yukihiro Nakanishi Japan	46	4.2k 1.2×	3.0k 0.9×	2.2k 0.7×	713 0.5×	1.6k 1.6×	189	8.3k
Ryoji Kushima Japan	45	3.0k 0.9×	2.7k 0.8×	2.0k 0.6×	1.1k 0.8×	1.2k 1.2×	321	7.1k
Toshio Uraoka Japan	42	5.2k 1.5×	2.9k 0.9×	3.2k 1.0×	586 0.4×	2.4k 2.4×	279	7.1k
Tamotsu Sugai Japan	36	1.7k 0.5×	1.6k 0.5×	2.2k 0.7×	1.4k 0.9×	509 0.5×	367	5.8k
Shunichi Tsujitani Japan	41	3.2k 0.9×	2.2k 0.7×	2.0k 0.6×	458 0.3×	1.2k 1.2×	198	6.1k
Tetsuo Ushiku Japan	35	1.5k 0.4×	1.6k 0.5×	2.0k 0.6×	719 0.5×	357 0.3×	305	5.0k
Do Youn Park South Korea	36	1.7k 0.5×	1.7k 0.5×	1.1k 0.3×	431 0.3×	988 1.0×	179	3.9k
I C Talbot United Kingdom	39	1.1k 0.3×	2.2k 0.7×	2.3k 0.7×	1.7k 1.1×	364 0.4×	93	4.8k

Countries citing papers authored by Yoichi Ajioka

Since Specialization

Citations

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

Fields of papers citing papers by Yoichi Ajioka

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Yoichi Ajioka

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

Ouchi, Akira, Koji Komori, Yusuke Kinugasa, et al.. (2025). Does surgical intervention contribute to survival for patients with para‐aortic lymph node metastasis from colorectal cancer?. Annals of Gastroenterological Surgery. 9(5). 997–1007.

Nozawa, Hiroaki, Kazuhito Sasaki, Shigenobu Emoto, et al.. (2024). Role of Adjuvant Chemotherapy After Surgical Resection of Paraaortic Lymph Node Metastasis from Colorectal Cancer—A Multicenter Retrospective Study. Annals of Surgical Oncology. 32(4). 2282–2291.

Yamada, Kazutaka, Yasumitsu Saiki, Yuki Iwasaki, et al.. (2024). The inguinal lymph nodes as regional lymph nodes in anal canal adenocarcinomas: a nationwide database analysis in Japan. Surgery Today. 54(12). 1505–1513.

Tanaka, Yusuke, Hitoshi Hino, Akio Shiomi, et al.. (2024). Efficacy of lateral lymph node dissection for local control of rectal cancer: A multicenter study. Annals of Gastroenterological Surgery. 8(4). 631–638.

Ueno, Hideki, Irıs D. Nagtegaal, Philip Quirke, Kenichi Sugihara, & Yoichi Ajioka. (2023). Tumor deposits in colorectal cancer: Refining their definition in the TNM system. Annals of Gastroenterological Surgery. 7(2). 225–235. 27 indexed citations

Yamamoto, Akira, Yuji Toiyama, Hiroki Ikeuchi, et al.. (2023). Oncological outcomes of Crohn's disease‐associated cancers focusing on disease behavior. Annals of Gastroenterological Surgery. 7(4). 615–625. 2 indexed citations

Uematsu, Kohya, Takashi Ushiki, Hajime Ishiguro, et al.. (2021). Osteoclastogenic Potential of Tissue-Engineered Periosteal Sheet: Effects of Culture Media on the Ability to Recruit Osteoclast Precursors. International Journal of Molecular Sciences. 22(4). 2169–2169. 1 indexed citations

Zhou, Qiliang, et al.. (2018). Trachea Engineering Using a Centrifugation Method and Mouse-Induced Pluripotent Stem Cells. Tissue Engineering Part C Methods. 24(9). 524–533. 5 indexed citations

Saitoh, Takashi, et al.. (2016). Effectiveness of Magnifying Narrow-Band Imaging Endoscopy for Differential Diagnosis between the High-Risk Mixed-Type and Low-Risk Simple-Type of Low-Grade, Well-Differentiated Gastric Tubular Adenocarcinoma. Gastroenterology Research and Practice. 2016. 1–10. 4 indexed citations

10.

Mizusawa, Takaki, et al.. (2012). A CASE OF TRUE URETERAL DIVERTICULUM ON FUNCTIONAL SOLITARY KIDNEY. The Japanese Journal of Urology. 103(3). 569–572. 1 indexed citations

11.

Nagahashi, Masayuki, Yoichi Ajioka, István Láng, et al.. (2008). Genetic changes of p53, K-ras, and microsatellite instability in gallbladder carcinoma in high-incidence areas of Japan and Hungary. World Journal of Gastroenterology. 14(1). 70–70. 49 indexed citations

12.

Ajioka, Yoichi, et al.. (2004). MUC1, MUC2, and MUC5AC Mucin Core Protein Expression in Ulcerative Colitis-associated Colorectal Carcinoma. 52(1). 21–27. 1 indexed citations

13.

Ajioka, Yoichi, et al.. (2004). The Absence of a Significant Role for β-Catenin in the Tumorigenesis of the Serrated Adenoma of the Colorectum : A Comparative Study with the Traditional Tubular Colorectal Adenoma. 52(4). 127–132. 1 indexed citations

14.

Nishikura, Ken, et al.. (2003). Carcinogenesis of gastric endocrine cell carcinoma: analysis of histopathology and p53 gene alteration. Gastric Cancer. 6(4). 203–209. 77 indexed citations

15.

Komori, Koji, Yoichi Ajioka, Hidenobu Watanabe, Koji Oda, & Yuji Nimura. (2003). p21^ and Ki-67 Expression of Serrated Adenoma of the Colorectum : An Investigation of Cell Differentiation/Maturation and its Relationship with Cell Proliferation. 51(4). 117–124. 1 indexed citations

16.

Yokoyama, Junji, Yoichi Ajioka, & Hidenobu Watanabe. (2002). Lymph Node Metastasis and Micrometastasis of Submucosal Invasive Colorectal Carcinoma: An Indicator of the Curative Potential of Endoscopic Treatment. 50(1). 1–8. 17 indexed citations

17.

Kazama, Shinsuke, Yoichi Ajioka, Hidenobu Watanabe, Toshiaki Watanabe, & Hirokazu Nagawa. (2002). Histogenesis and morphogenesis of depressed‐type early colorectal carcinoma. Pathology International. 52(2). 119–125. 6 indexed citations

18.

Taguchi, Yumiko, et al.. (2000). CLINICOPATHOLOGICAL STUDY OF SERRATED ADENOMAS OF THE COLORECTUM. Acta gastro-enterologica belgica. 42(3). 247–257. 2 indexed citations

19.

Nakagawa, Satoru, Hidenobu Watanabe, Yoichi Ajioka, et al.. (1996). Archival Analysis of p53 Protein Overexpression and Genetic Mutation in Esophageal Squamous Cell Carcinoma. 44(2). 63–69. 5 indexed citations

20.

Ajioka, Yoichi, et al.. (1995). Macroscopic Characteristics of Tubular Adenomas in Familial Adenomatosis Coli : The Relationship between Size, Gross Configuration and Location. 43(2). 63–68. 2 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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