Hiroshi Obata

4.8k total citations · 1 hit paper
106 papers, 3.8k citations indexed

About

Hiroshi Obata is a scholar working on Epidemiology, Hepatology and Molecular Biology. According to data from OpenAlex, Hiroshi Obata has authored 106 papers receiving a total of 3.8k indexed citations (citations by other indexed papers that have themselves been cited), including 41 papers in Epidemiology, 39 papers in Hepatology and 17 papers in Molecular Biology. Recurrent topics in Hiroshi Obata's work include Liver Disease Diagnosis and Treatment (25 papers), Hepatitis B Virus Studies (21 papers) and Liver Disease and Transplantation (12 papers). Hiroshi Obata is often cited by papers focused on Liver Disease Diagnosis and Treatment (25 papers), Hepatitis B Virus Studies (21 papers) and Liver Disease and Transplantation (12 papers). Hiroshi Obata collaborates with scholars based in Japan, United States and Pakistan. Hiroshi Obata's co-authors include Kunio Okuda, Yukio Nakajima, Nobuo Okazaki, Toshio Ohtsuki, Kunihiko Ohnishi, Masahiko Tomimatsu, Hiroshi Hasegawa, Hiroaki Okuda, Yoji Motoike and Yasuhiko Kubo and has published in prestigious journals such as The Lancet, Gastroenterology and Hepatology.

In The Last Decade

Hiroshi Obata

102 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.

Natural history of hepatocellular carcinoma and prognosis in relation to treatment study of 850 patients

1985 1.6k citations Hiroshi Obata, Masahiko Tomimatsu et al. profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Hiroshi Obata Japan	26	2.6k	1.7k	873	607	525	106	3.8k
Shigetoshi Fujiyama Japan	29	3.0k 1.2×	2.4k 1.4×	348 0.4×	500 0.8×	295 0.6×	124	4.2k
Ja Kyung Kim South Korea	34	2.5k 1.0×	2.1k 1.2×	800 0.9×	383 0.6×	319 0.6×	149	3.8k
Fukuo Kondo Japan	34	1.8k 0.7×	1.3k 0.8×	1.2k 1.4×	1.1k 1.8×	312 0.6×	140	3.7k
Loreto Boix Spain	29	2.7k 1.0×	1.9k 1.1×	694 0.8×	845 1.4×	810 1.5×	68	4.4k
Kazuhiro Nouso Japan	39	2.5k 1.0×	1.9k 1.1×	819 0.9×	1.1k 1.8×	1.1k 2.1×	221	5.0k
Mary A. Maluccio United States	26	1.7k 0.7×	1.0k 0.6×	1.2k 1.4×	1.1k 1.8×	662 1.3×	77	4.4k
Si Hyun Bae South Korea	40	3.9k 1.5×	2.7k 1.6×	1.1k 1.2×	818 1.3×	672 1.3×	250	5.6k
Kaoru Tsuchiya Japan	30	2.5k 1.0×	2.0k 1.2×	357 0.4×	305 0.5×	256 0.5×	140	3.2k
Katsunori Yoshida Japan	32	1.2k 0.5×	882 0.5×	604 0.7×	782 1.3×	239 0.5×	122	3.6k
David K. Imagawa United States	36	1.7k 0.7×	1.0k 0.6×	2.2k 2.5×	547 0.9×	158 0.3×	131	4.0k

Countries citing papers authored by Hiroshi Obata

Since Specialization

Citations

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

Fields of papers citing papers by Hiroshi Obata

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Hiroshi Obata

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

Doi, Hiroyuki, et al.. (2024). Sex determination by ultrasonography prior to artificial breeding of the pufferfish Arothron manilensis (Tetraodontiformes, Tetraodontidae). Zoo Biology. 43(3). 287–291.

Shizuma, Toru, Hiroshi Obata, Etsuko Hashimoto, & Keiko Shiratori. (2003). Relationship between bacteremia and severity of liver dysfunction in patients with liver cirrhosis. Kanzo. 44(12). 641–648. 3 indexed citations

Shizuma, Toru, Hiroshi Obata, Etsuko Hashimoto, Kiyoshi Hasegawa, & Naoaki Hayashi. (2002). Clinical analysis of drug-induced liver injury.. Kanzo. 43(7). 309–315. 1 indexed citations

Shizuma, Toru, Hiroshi Obata, Etsuko Hashimoto, & Naoaki Hayashi. (2002). Clinical analysis of bacterial infections in cirrhotic patients with ascites.. Kanzo. 43(10). 446–452. 3 indexed citations

Ludwig, Jürgen, Etsuko Hashimoto, Hiroshi Obata, & William P. Baldus. (1993). Idiopathic portal hypertension. Hepatology. 17(6). 1157–1162. 28 indexed citations

Ando, Yukio, et al.. (1993). Two cases of fulminant hepatic failure in malignant lymphoma.. Kanzo. 34(10). 819–824. 1 indexed citations

Hashimoto, Etsuko, et al.. (1993). A case of post-infantile giant cell hapatitis with positive of LE cell, antinuclear antibody.. Kanzo. 34(3). 239–243. 2 indexed citations

Hashimoto, Etsuko, et al.. (1993). Liver biopsy features of acute hepatitis C compared with hepatitis A, B, and non‐A, non‐B, non‐C. Liver International. 13(2). 69–73. 25 indexed citations

Kojimahara, Noriko, et al.. (1992). A case report. Middle-aged congenital hepatic fibrosis followed up as idiopathic portal hypertension.. Kanzo. 33(8). 643–648. 1 indexed citations

10.

Nakano, Masayuki, et al.. (1990). A histopathologic study of early hepatocellular carcinoma (HCC): Portal tract invasion and progression to advanced HCC. Kanzo. 31(7). 754–761. 11 indexed citations

11.

Nakanishi, Toshimi, et al.. (1989). Comparison of Effects of Menaquinone-4 and Menaquinone-7 Assessed by Decrease of PIVKA-II Levels in Human Hepatoma Cells in Culture. 63(5). 253–257. 6 indexed citations

12.

Mariyama, Mariko, Kiyozo Kishi, Kozo Nakamura, Hiroshi Obata, & Susumu Nishimura. (1989). Frequency and Types of Point Mutation at the 12th Codon of the c‐Ki‐ras Gene Found in Pancreatic Cancers from Japanese Patients. Japanese Journal of Cancer Research. 80(7). 622–626. 104 indexed citations

13.

Okuda, Hiroaki, et al.. (1988). Production of abnormal prothrombin(PIVKA-II) by human hepatoma cells in culture.. Kanzo. 29(1). 47–51. 3 indexed citations

14.

Komatsu, Tatsuji, Katsumi Yamauchi, Kiyoshi Hasegawa, et al.. (1987). Clinical trial of trans-arterial administration of LAK and IL-2 to patient with hepatocellural carcinoma - Case reports.. Kanzo. 28(4). 477–482. 2 indexed citations

15.

Hashimoto, Etsuko, Toshimi Nakanishi, Takeshi Kurihara, et al.. (1986). Long-term outcome of hepatitis B vaccination and memory of immunization.. Kanzo. 27(10). 1371–1375. 1 indexed citations

16.

Okuda, Hiroaki, Toshimi Nakanishi, Ryuji FURUKAWA, Etsuko Hashimoto, & Hiroshi Obata. (1986). Production of abnormal prothrombin (PIVKA-II) by hepatocellular carcinoma. A clinical and experimental study.. Kanzo. 27(12). 1697–1702. 2 indexed citations

17.

Hashimoto, Etsuko, Hiroshi Obata, Toshimi Nakanishi, et al.. (1985). HLA antigens and anti-HBs response to hepatitis B vaccine.. Kanzo. 26(2). 157–164. 6 indexed citations

18.

Takasaki, Ken, Seiichi Tanaka, Akiko Saito, et al.. (1982). Experiences with hepatic resection of 60 cases of hepatocellular carcinoma. Kanzo. 23(2). 159–164. 2 indexed citations

19.

Tanaka, Seiichi, et al.. (1982). . Kanzo. 23(2). 159–164. 2 indexed citations

20.

Obata, Hiroshi, Naoaki Hayashi, T Hisamitsu, et al.. (1976). Development of Hepatocellular Carcinoma on the Ground of Chronic Liver Diseases. Kanzo. 17(5). 335–347. 1 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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