Akihiko Oka

2.5k total citations
76 papers, 1.4k citations indexed

About

Akihiko Oka is a scholar working on Surgery, Epidemiology and Molecular Biology. According to data from OpenAlex, Akihiko Oka has authored 76 papers receiving a total of 1.4k indexed citations (citations by other indexed papers that have themselves been cited), including 34 papers in Surgery, 21 papers in Epidemiology and 16 papers in Molecular Biology. Recurrent topics in Akihiko Oka's work include Microscopic Colitis (15 papers), Inflammatory Bowel Disease (14 papers) and Gut microbiota and health (13 papers). Akihiko Oka is often cited by papers focused on Microscopic Colitis (15 papers), Inflammatory Bowel Disease (14 papers) and Gut microbiota and health (13 papers). Akihiko Oka collaborates with scholars based in Japan, United States and New Zealand. Akihiko Oka's co-authors include R. Balfour Sartor, Shunji Ishihara, Yoshikazu Kinoshita, Yoshiyuki Mishima, Ryusaku Kusunoki, Takafumi Yuki, Kousaku Kawashima, Yasumasa Tada, Naoki Oshima and Ichiro Moriyama and has published in prestigious journals such as Journal of Clinical Investigation, Nature Communications and Gastroenterology.

In The Last Decade

Akihiko Oka

70 papers receiving 1.4k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Akihiko Oka Japan 22 514 379 345 306 276 76 1.4k
Yoshiyuki Mishima Japan 24 508 1.0× 379 1.0× 333 1.0× 236 0.8× 541 2.0× 66 1.5k
Takehide Fujimoto Japan 13 628 1.2× 211 0.6× 380 1.1× 270 0.9× 236 0.9× 30 1.2k
David Neumann United States 19 443 0.9× 344 0.9× 222 0.6× 161 0.5× 241 0.9× 69 1.7k
Marijn C. Visschedijk Netherlands 15 656 1.3× 309 0.8× 573 1.7× 348 1.1× 205 0.7× 53 1.3k
Charlotte Hedin Sweden 21 848 1.6× 405 1.1× 716 2.1× 358 1.2× 397 1.4× 58 1.8k
Andreas Luegering Germany 10 408 0.8× 480 1.3× 387 1.1× 226 0.7× 447 1.6× 22 1.5k
Roberto Ferrarese Italy 19 880 1.7× 225 0.6× 224 0.6× 237 0.8× 216 0.8× 36 1.6k
Lucrezia Laterza Italy 18 430 0.8× 423 1.1× 253 0.7× 211 0.7× 88 0.3× 74 1.3k
Timothy L. Zisman United States 13 482 0.9× 250 0.7× 446 1.3× 383 1.3× 156 0.6× 21 1.2k
Ulrich Böcker Germany 19 381 0.7× 273 0.7× 312 0.9× 324 1.1× 290 1.1× 36 1.2k

Countries citing papers authored by Akihiko Oka

Since Specialization
Citations

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

Fields of papers citing papers by Akihiko Oka

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Akihiko Oka

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

All Works

20 of 20 papers shown
1.
Fukuba, Nobuhiko, Akihiko Oka, Naoki Oshima, et al.. (2025). Impact of a patient fixation device on healthcare worker radiation doses in fluoroscopy-assisted endoscopy. Radiation Protection Dosimetry. 201(17). 1159–1165.
2.
Oka, Akihiko, Muyiwa Awoniyi, Yuri Yoshida, et al.. (2024). Dynamic ultrasonography for optimizing treatment position in superior mesenteric artery syndrome: Two case reports and review of literature. World Journal of Gastroenterology. 30(5). 499–508. 2 indexed citations
3.
Tobita, Hiroshi, et al.. (2024). Changes in Hepatic Density Due to Oral Amiodarone-induced Liver injury Shown by Computed Tomography. Internal Medicine. 64(12). 1828–1833.
4.
Oka, Akihiko, Yuri Yoshida, Hiroshi Tobita, et al.. (2023). EP129 SUPERIOR MESENTERIC ARTERY SYNDROME -A SYSTEMATIC REVIEW OF 2,453 CASES IN THE LITERATURE. Gastroenterology. 164(6). S–1215. 1 indexed citations
5.
Oka, Akihiko, Muyiwa Awoniyi, Yuri Yoshida, et al.. (2023). Superior mesenteric artery syndrome: Diagnosis and management. World Journal of Clinical Cases. 11(15). 3369–3384. 31 indexed citations
6.
Zhang, Shiying, Xochitl C. Morgan, Belgin Dogan, et al.. (2022). Mucosal metabolites fuel the growth and virulence of E. coli linked to Crohn’s disease. JCI Insight. 7(10). 21 indexed citations
7.
Mishiro, Tsuyoshi, Kotaro Shibagaki, Masatoshi Kataoka, et al.. (2022). KLF4 Mutation Shapes Pathologic Characteristics of Foveolar-Type Gastric Adenoma in Helicobacter pylori–Naive Patients. American Journal Of Pathology. 192(9). 1250–1258. 11 indexed citations
8.
Oshima, Naoki, Eiko Okimoto, Hiroki Sonoyama, et al.. (2022). Long-lasting renal dysfunction following tacrolimus induction therapy in ulcerative colitis patients. Journal of Clinical Biochemistry and Nutrition. 70(3). 297–303.
9.
Kawashima, Kousaku, Naoki Oshima, Masatoshi Kataoka, et al.. (2022). Low Fecal Calprotectin Predicts Histological Healing in Patients with Ulcerative Colitis with Endoscopic Remission and Leads to Prolonged Clinical Remission. Inflammatory Bowel Diseases. 29(3). 359–366. 12 indexed citations
10.
Fornelos, Nadine, Eric A. Franzosa, Jason Bishai, et al.. (2020). Growth effects of N-acylethanolamines on gut bacteria reflect altered bacterial abundances in inflammatory bowel disease. Nature Microbiology. 5(3). 486–497. 74 indexed citations
11.
Montrose, David C., Srijani Basu, Xi Kathy Zhou, et al.. (2020). Dietary Fructose Alters the Composition, Localization, and Metabolism of Gut Microbiota in Association With Worsening Colitis. Cellular and Molecular Gastroenterology and Hepatology. 11(2). 525–550. 74 indexed citations
12.
Tobita, Hiroshi, Masatoshi Kataoka, Akihiko Oka, et al.. (2020). Comparison of dapagliflozin and teneligliptin in nonalcoholic fatty liver disease patients without type 2 diabetes mellitus: a prospective randomized study. Journal of Clinical Biochemistry and Nutrition. 68(2). 173–180. 29 indexed citations
13.
Kawashima, Kousaku, Naoki Oshima, Takafumi Yuki, et al.. (2020). Sa1876 LOW FECAL CALPROTECTIN LEVEL PREDICTS HISTOLOGICAL HEALING AND PROLONGED CLINICAL REMISSION IN ULCERATIVE COLITIS PATIENTS WITH CLINICAL REMISSION AND MUCOSAL HEALING. Gastroenterology. 158(6). S–461. 1 indexed citations
14.
Mishima, Yoshiyuki, Akihiko Oka, Bo Liu, et al.. (2019). Microbiota maintain colonic homeostasis by activating TLR2/MyD88/PI3K signaling in IL-10–producing regulatory B cells. Journal of Clinical Investigation. 129(9). 3702–3716. 125 indexed citations
15.
Kusunoki, Ryusaku, Shunji Ishihara, Yasumasa Tada, et al.. (2015). Role of milk fat globule-epidermal growth factor 8 in colonic inflammation and carcinogenesis. Journal of Gastroenterology. 50(8). 862–875. 20 indexed citations
16.
Oka, Akihiko, Ayumu Takeno, Ryusaku Kusunoki, et al.. (2015). Crowned Dens Syndrome: Report of Three Cases and a Review of the Literature. Journal of Emergency Medicine. 49(1). e9–e13. 28 indexed citations
17.
Kawashima, Kousaku, Shunji Ishihara, Takafumi Yuki, et al.. (2014). Therapeutic Efficacy of pH-Dependent Release Formulation of Mesalazine on Active Ulcerative Colitis Resistant to Time-Dependent Release Formulation: Analysis of Fecal Calprotectin Concentration. BioMed Research International. 2014. 1–6. 7 indexed citations
18.
Oka, Akihiko, et al.. (2013). [Small bowel obstruction and gastric ulceration resulting from rice cake ingestion -computed tomography diagnosis in eight patients-].. PubMed. 110(10). 1804–13. 4 indexed citations
19.
Kusunoki, Ryusaku, Shunji Ishihara, Monowar Aziz, et al.. (2012). Roles of Milk Fat Globule-Epidermal Growth Factor 8 in Intestinal Inflammation. Digestion. 85(2). 103–107. 23 indexed citations
20.
Ishihara, Shunji, M. A. Karim Rumi, Yoshiyuki Mishima, et al.. (2008). Prolactin induces MFG-E8 production in macrophages via transcription factor C/EBPβ-dependent pathway. APOPTOSIS. 13(5). 609–620. 32 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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