Fumihiko Koiwa

2.2k total citations
93 papers, 1.2k citations indexed

About

Fumihiko Koiwa is a scholar working on Nephrology, Genetics and Nutrition and Dietetics. According to data from OpenAlex, Fumihiko Koiwa has authored 93 papers receiving a total of 1.2k indexed citations (citations by other indexed papers that have themselves been cited), including 75 papers in Nephrology, 20 papers in Genetics and 19 papers in Nutrition and Dietetics. Recurrent topics in Fumihiko Koiwa's work include Parathyroid Disorders and Treatments (55 papers), Dialysis and Renal Disease Management (30 papers) and Magnesium in Health and Disease (18 papers). Fumihiko Koiwa is often cited by papers focused on Parathyroid Disorders and Treatments (55 papers), Dialysis and Renal Disease Management (30 papers) and Magnesium in Health and Disease (18 papers). Fumihiko Koiwa collaborates with scholars based in Japan, Greece and United States. Fumihiko Koiwa's co-authors include Tadao Akizawa, Etsuro Ogata, Eriko Kinugasa, Masahide Mizobuchi, Masafumi Fukagawa, Takashi Shigematsu, Keitaro Yokoyama, Hitoshi Kato, Noritaka Onoda and Tomoyuki Okada and has published in prestigious journals such as PLoS ONE, The Journal of Clinical Endocrinology & Metabolism and Scientific Reports.

In The Last Decade

Fumihiko Koiwa

86 papers receiving 1.2k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Fumihiko Koiwa Japan 19 917 341 251 243 230 93 1.2k
Vincent Brandenburg Germany 20 730 0.8× 427 1.3× 220 0.9× 183 0.8× 122 0.5× 41 1.4k
Laura Kooienga United States 9 1.1k 1.2× 461 1.4× 295 1.2× 152 0.6× 135 0.6× 27 1.2k
Brice Mayor France 14 820 0.9× 230 0.7× 306 1.2× 192 0.8× 168 0.7× 30 953
Kátia R. Neves Brazil 12 991 1.1× 329 1.0× 263 1.0× 123 0.5× 181 0.8× 15 1.1k
João Frazão Portugal 18 898 1.0× 250 0.7× 377 1.5× 127 0.5× 133 0.6× 66 1.1k
Karen Laliberte United States 15 797 0.9× 227 0.7× 307 1.2× 154 0.6× 257 1.1× 28 1.3k
Rupal Mehta United States 17 519 0.6× 131 0.4× 109 0.4× 112 0.5× 145 0.6× 55 937
Melani Ribeiro Custódio Brazil 14 563 0.6× 143 0.4× 167 0.7× 162 0.7× 123 0.5× 45 774
Nadine Kaesler Germany 18 415 0.5× 275 0.8× 73 0.3× 166 0.7× 102 0.4× 26 1.1k
Lourdes Craver Spain 14 410 0.4× 167 0.5× 250 1.0× 140 0.6× 79 0.3× 24 824

Countries citing papers authored by Fumihiko Koiwa

Since Specialization
Citations

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

Fields of papers citing papers by Fumihiko Koiwa

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Fumihiko Koiwa

This figure shows the co-authorship network connecting the top 25 collaborators of Fumihiko Koiwa. A scholar is included among the top collaborators of Fumihiko Koiwa 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 Fumihiko Koiwa. Fumihiko Koiwa 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.
Saito, Tomohiro, Tadashi Kato, Noriyuki Kato, et al.. (2025). Phosphate binder pill burden and cardiovascular events in patients undergoing hemodialysis. Therapeutic Apheresis and Dialysis. 29(3). 333–344.
2.
Kawanishi, Kunio, Masaki Baba, Dedong Kang, et al.. (2024). Acute Tubular Injury and Fanconi Syndrome Associated With Red Yeast Rice Supplement. Kidney International Reports. 10(3). 956–959.
3.
Inaguma, Daijo, Fumihiko Koiwa, Masanori Tokumoto, et al.. (2023). Phase 2 study of upacicalcet in Japanese haemodialysis patients with secondary hyperparathyroidism: an intraindividual dose-adjustment study. Clinical Kidney Journal. 16(12). 2614–2625. 1 indexed citations
4.
Shigematsu, Takashi, Fumihiko Koiwa, Yoshitaka Isaka, et al.. (2023). Efficacy and Safety of Upacicalcet in Hemodialysis Patients with Secondary Hyperparathyroidism. Clinical Journal of the American Society of Nephrology. 18(10). 1300–1309. 15 indexed citations
5.
Saito, Tomohiro, Masahide Mizobuchi, Tadashi Kato, et al.. (2023). Fibroblast Growth Factor 23 Exacerbates Cardiac Fibrosis in Deoxycorticosterone Acetate-Salt Mice With Hypertension. Laboratory Investigation. 103(1). 100003–100003. 4 indexed citations
6.
Kazama, Junichiro James, Fumihiko Koiwa, Keitaro Yokoyama, et al.. (2022). First-in-Patient Phase I/II Study of Upacicalcet in Japanese Patients with Secondary Hyperparathyroidism Undergoing Hemodialysis: Pharmacokinetic and Pharmacodynamic Properties. Clinical Pharmacokinetics. 61(9). 1271–1284. 8 indexed citations
7.
Nishiwaki, Hiroki, et al.. (2021). Granulomatosis with polyangiitis in a patient with a thoracic vertebral lesion: a case report. Modern Rheumatology Case Reports. 5(2). 347–353.
8.
Koiwa, Fumihiko, et al.. (2021). Efficacy of Evocalcet in Previously Cinacalcet-Treated Secondary Hyperparathyroidism Patients. Kidney International Reports. 6(11). 2830–2839. 6 indexed citations
9.
Mizobuchi, Masahide, et al.. (2020). Lower soluble Klotho levels in the pretransplant period are associated with an increased risk of renal function decline in renal transplant patients. Therapeutic Apheresis and Dialysis. 25(3). 331–340. 2 indexed citations
10.
Nishiwaki, Hiroki, Takeshi Hasegawa, Fumihiko Koiwa, Takayuki Hamano, & Ikuto Masakane. (2019). The association of the difference in hemoglobin levels before and after hemodialysis with the risk of 1-year mortality in patients undergoing hemodialysis. Results from a nationwide cohort study of the Japanese Renal Data Registry. PLoS ONE. 14(1). e0210533–e0210533. 2 indexed citations
11.
12.
Maruta, Yuichi, Takeshi Hasegawa, Hiroki Nishiwaki, et al.. (2018). Association between serum Na–Cl level and renal function decline in chronic kidney disease: results from the chronic kidney disease Japan cohort (CKD-JAC) study. Clinical and Experimental Nephrology. 23(2). 215–222. 14 indexed citations
13.
Hayashi, Toshihide, Yuri Tanaka, Masaki Iwasaki, et al.. (2018). Association of Circulatory Iron Deficiency With an Enlarged Heart in Patients With End-Stage Kidney Disease. Journal of Renal Nutrition. 29(1). 39–47. 1 indexed citations
14.
Taketani, Yutaka, Fumihiko Koiwa, & Keitaro Yokoyama. (2016). Management of phosphorus load in CKD patients. Clinical and Experimental Nephrology. 21(S1). 27–36. 16 indexed citations
15.
Akizawa, Tadao & Fumihiko Koiwa. (2015). Clinical Expectation of Online Hemodiafiltration: A Japanese Perspective. Blood Purification. 40(Suppl. 1). 12–16. 14 indexed citations
16.
Ohya, Masaki, Shigeo Negi, Toshifumi Sakaguchi, et al.. (2014). Significance of Serum Magnesium as an Independent Correlative Factor on the Parathyroid Hormone Level in Uremic Patients. The Journal of Clinical Endocrinology & Metabolism. 99(10). 3873–3878. 25 indexed citations
17.
Honda, Hirokazu, Fumihiko Koiwa, Etsuro Ogata, et al.. (2014). Active vitamin D analogs, maxacalcitol and alfacalcidol, as maintenance therapy for mild secondary hyperparathyroidism in hemodialysis patients â a randomized study. International Journal of Clinical Pharmacology and Therapeutics. 52(5). 360–368. 1 indexed citations
18.
Koiwa, Fumihiko & Yoshinori Sato. (2009). [Management of phosphate in chronic kidney disease--Chemistry and history of phosphate binder].. PubMed. 19(2). 198–204. 1 indexed citations
19.
Koiwa, Fumihiko & Takeshi Hasegawa. (2007). [Indication of parathyroid intervention].. PubMed. 17(5). 760–6.
20.
Ogata, Etsuro, et al.. (1999). Plasma Exchange for Acquired Hemophilia: A Case Report. Therapeutic Apheresis. 3(4). 320–322. 11 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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