Kazutaka Obama

4.8k total citations · 1 hit paper
176 papers, 2.9k citations indexed

About

Kazutaka Obama is a scholar working on Surgery, Pulmonary and Respiratory Medicine and Oncology. According to data from OpenAlex, Kazutaka Obama has authored 176 papers receiving a total of 2.9k indexed citations (citations by other indexed papers that have themselves been cited), including 98 papers in Surgery, 75 papers in Pulmonary and Respiratory Medicine and 64 papers in Oncology. Recurrent topics in Kazutaka Obama's work include Gastric Cancer Management and Outcomes (59 papers), Esophageal and GI Pathology (33 papers) and Colorectal Cancer Surgical Treatments (30 papers). Kazutaka Obama is often cited by papers focused on Gastric Cancer Management and Outcomes (59 papers), Esophageal and GI Pathology (33 papers) and Colorectal Cancer Surgical Treatments (30 papers). Kazutaka Obama collaborates with scholars based in Japan, United States and South Korea. Kazutaka Obama's co-authors include Yoshiharu Sakai, Hiroshi Okabe, Kenji Kawada, Shigeru Tsunoda, Takehito Yamamoto, Eiji Tanaka, Shigeo Hisamori, Yoichi Furukawa, Hisahiro Hosogi and Ichiro Uyama and has published in prestigious journals such as Proceedings of the National Academy of Sciences, Nature Communications and SHILAP Revista de lepidopterología.

In The Last Decade

Kazutaka Obama

152 papers receiving 2.9k 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.

Inflammation-Related Biomarkers for the Prediction of Prognosis in Colorectal Cancer Patients

2021 265 citations Takehito Yamamoto, Kenji Kawada et al. International Journal of Molecular Sciences profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Kazutaka Obama Japan	30	1.7k	1.4k	838	758	386	176	2.9k
Manabu Ohashi Japan	27	2.1k 1.2×	1.5k 1.1×	850 1.0×	583 0.8×	364 0.9×	154	2.8k
Norihito Wada Japan	25	1.5k 0.9×	1.6k 1.1×	508 0.6×	648 0.9×	261 0.7×	170	2.6k
Yun‐Suhk Suh South Korea	28	1.5k 0.9×	1.1k 0.8×	583 0.7×	459 0.6×	230 0.6×	120	2.3k
Ru‐Hong Tu China	31	1.8k 1.1×	1.2k 0.8×	718 0.9×	983 1.3×	313 0.8×	152	2.9k
Xiao‐Long Chen China	25	1.1k 0.6×	745 0.5×	357 0.4×	590 0.8×	389 1.0×	100	1.9k
Nobuhiro Takiguchi Japan	26	1.2k 0.7×	1.2k 0.8×	373 0.4×	1.2k 1.6×	233 0.6×	131	2.5k
Hiroyuki Osawa Japan	31	1.2k 0.7×	2.0k 1.4×	686 0.8×	667 0.9×	451 1.2×	118	3.3k
Sung Kwan Shin South Korea	31	2.1k 1.2×	1.6k 1.2×	978 1.2×	859 1.1×	354 0.9×	174	3.3k
Satoshi Tanabe Japan	34	3.1k 1.8×	2.2k 1.6×	1.4k 1.7×	860 1.1×	372 1.0×	185	4.4k
Tsuyoshi Etoh Japan	27	1.4k 0.8×	1.0k 0.7×	625 0.7×	1.0k 1.4×	470 1.2×	111	2.7k

Countries citing papers authored by Kazutaka Obama

Since Specialization

Citations

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

Fields of papers citing papers by Kazutaka Obama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Kazutaka Obama

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

Yoshida, Yu, Yoshiro Itatani, Koya Hida, et al.. (2025). Robot-Assisted Total Proctocolectomy for Familial Adenomatous Polyposis with Multiple Colorectal Cancers Using the Hugo RAS System. Surgical Case Reports. 11(1). n/a–n/a.

Wada, Hiroshi, Shinichiro Hasegawa, Kei Asukai, et al.. (2024). Prediction for oxaliplatin‐induced liver injury using patient‐derived liver organoids. Cancer Medicine. 13(3). e7042–e7042. 5 indexed citations

Kawada, Kenji, et al.. (2024). Neutrophil and Colorectal Cancer. International Journal of Molecular Sciences. 26(1). 6–6. 3 indexed citations

Yoshida, Shinya, et al.. (2024). Anterior versus posterior mediastinal reconstruction after esophagectomy in esophageal cancer patients: a systematic review and meta-analysis. Langenbeck s Archives of Surgery. 409(1). 88–88. 1 indexed citations

Itatani, Yoshiro, Kenji Kawada, Rei Mizuno, et al.. (2023). Downregulation of osteoprotegerin in colorectal cancer cells promotes liver metastasis via activating tumor-associated macrophage. Scientific Reports. 13(1). 22217–22217.

Hida, Koya, Yutaka Yonemura, Toshiyuki Kitai, et al.. (2023). Analysis of the characteristics and outcomes of patients with pseudomyxoma peritonei of appendiceal origin treated with curative-intent surgery. Surgical Oncology. 51. 102012–102012. 4 indexed citations

Matsubara, Hiroyuki, Hiroyuki Miyoshi, Fumihiko Kakizaki, et al.. (2023). Efficacious Combination Drug Treatment for Colorectal Cancer That Overcomes Resistance to KRAS G12C Inhibitors. Molecular Cancer Therapeutics. 22(4). 529–538. 4 indexed citations

Yoshida, Shinya, Koya Hida, Kazuyuki Okada, et al.. (2023). Comparison of Cytoreductive Surgery and Resection of Isolated Peritoneal Metastases in Patients with Peritoneal Metastases from Colorectal Cancer: A Retrospective Study. SHILAP Revista de lepidopterología. 7(2). 91–101. 1 indexed citations

Fujita, Yusuke, Yoshiro Itatani, Kenji Kawada, et al.. (2023). Total pelvic exenteration for mucinous adenocarcinoma arising from an implantation cyst 26 years after surgery for rectal cancer. Asian Journal of Endoscopic Surgery. 16(3). 558–562.

10.

Murakami, Takaaki, Shigeru Tsunoda, Atsushi Ikeda, et al.. (2023). Big insulin-like growth factor 2-producing multiple solitary fibrous tumors treated with debulking surgery: A case report. Frontiers in Endocrinology. 14. 1071899–1071899. 5 indexed citations

11.

Shimizu, Shota, Jumpei Kondo, Kunishige Onuma, et al.. (2023). Inhibition of the bone morphogenetic protein pathway suppresses tumor growth through downregulation of epidermal growth factor receptor in MEK/ERK‐dependent colorectal cancer. Cancer Science. 114(9). 3636–3648. 6 indexed citations

12.

Hisamori, Shigeo, Yasunori Deguchi, Tatsuto Nishigori, et al.. (2021). PTEN is a predictive biomarker of trastuzumab resistance and prognostic factor in HER2-overexpressing gastroesophageal adenocarcinoma. Scientific Reports. 11(1). 9013–9013. 9 indexed citations

13.

Yoshida, Shinya, Tatsuto Nishigori, Shigeru Tsunoda, et al.. (2021). Chronological Changes in Skeletal Muscle Mass Two Years after Minimally Invasive Esophagectomy: A Prospective Cohort Study. Surgical Endoscopy. 36(2). 1527–1535. 10 indexed citations

14.

Ueda, Yôko, Shigeru Tsunoda, Shigeo Hisamori, et al.. (2020). Laparoscopic surgery for ventrally located epiphrenic diverticulum with esophageal achalasia. Clinical Journal of Gastroenterology. 13(4). 491–494. 2 indexed citations

15.

Uyama, Ichiro, Koichi Suda, Masaya Nakauchi, et al.. (2018). Clinical advantages of robotic gastrectomy for clinical stage I/II gastric cancer: a multi-institutional prospective single-arm study. Gastric Cancer. 22(2). 377–385. 158 indexed citations

16.

Obama, Kazutaka, et al.. (2016). Proposal of Laparoscopic Surgery Support System using View Sharing. The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec). 2016(0). 1A1–02b2.

17.

Obama, Kazutaka, et al.. (2013). A novel drug delivery system of intraperitoneal chemotherapy for peritoneal carcinomatosis using gelatin microspheres incorporating cisplatin. Surgery. 154(5). 991–999. 35 indexed citations

18.

Okabe, Hiroshi, Kazutaka Obama, Eiji Tanaka, et al.. (2013). Functional end-to end esophago-jejunal anastomosis using linear staplers following laparoscopic total gastrectomy. 2(2). 81–82.

19.

Woo, Yanghee, Woo Jin Hyung, Kyung Ho Pak, Kazutaka Obama, & Sung Hoon Noh. (2011). Successful cholecystectomy during robotic gastrectomy. Minimally Invasive Therapy & Allied Technologies. 21(4). 276–281. 1 indexed citations

20.

Obama, Kazutaka, Seiji Satoh, Ryuji Hamamoto, et al.. (2008). Enhanced Expression of RAD51 Associating Protein-1 Is Involved in the Growth of Intrahepatic Cholangiocarcinoma Cells. Clinical Cancer Research. 14(5). 1333–1339. 40 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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