{"id":"https://openalex.org/A5084936688","orcid":"https://orcid.org/0000-0001-9743-6473","observed_orcids":["https://orcid.org/0000-0001-9743-6473"],"display_name":"Yu Koyama","raw_author_names":["KOYAMA, Yu","Y Koyama","Y. Koyama","YU KOYAMA","Yu KOYAMA","Yu Koyama"],"full_name":"Koyama, Yu","works_count":126,"cited_by_count":1863,"summary_stats":{"2yr_mean_citedness":1.8333333333333333,"h_index":23,"i10_index":32},"ids":{"openalex":"https://openalex.org/A5084936688","orcid":"https://orcid.org/0000-0001-9743-6473","observed_orcids":["https://orcid.org/0000-0001-9743-6473"]},"affiliations":[{"institution":{"id":"https://openalex.org/I1292894508","ror":"https://ror.org/0499dwk57","display_name":"Roswell Park Comprehensive Cancer Center","country_code":"US","type":"facility","lineage":["https://openalex.org/I1292894508"]},"years":[2019]},{"institution":{"id":"https://openalex.org/I13491362","ror":"https://ror.org/057vy9683","display_name":"Hamamatsu University","country_code":"JP","type":"education","lineage":["https://openalex.org/I13491362"]},"years":[2006]},{"institution":{"id":"https://openalex.org/I159385669","ror":"https://ror.org/01hjzeq58","display_name":"Chiba University","country_code":"JP","type":"education","lineage":["https://openalex.org/I159385669"]},"years":[2008]},{"institution":{"id":"https://openalex.org/I184840846","ror":"https://ror.org/02nkdxk79","display_name":"Virginia Commonwealth University","country_code":"US","type":"education","lineage":["https://openalex.org/I184840846"]},"years":[2016,2014]},{"institution":{"id":"https://openalex.org/I4210085859","ror":"https://ror.org/000889019","display_name":"Institute of Nephrology of the National Academy of Medical Sciences of Ukraine","country_code":"UA","type":"facility","lineage":["https://openalex.org/I4210085859","https://openalex.org/I4210144782","https://openalex.org/I4405285930"]},"years":[2001]},{"institution":{"id":"https://openalex.org/I4210092137","ror":"https://ror.org/00e18hs98","display_name":"Niigata Cancer Center Hospital","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210092137"]},"years":[2017]},{"institution":{"id":"https://openalex.org/I4210099339","ror":"https://ror.org/0126xah18","display_name":"Chiba University Hospital","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210099339"]},"years":[2008]},{"institution":{"id":"https://openalex.org/I4210124653","ror":"https://ror.org/03b0x6j22","display_name":"Niigata University Medical and Dental Hospital","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210124653"]},"years":[2020,2017,2009,2005]},{"institution":{"id":"https://openalex.org/I43777268","ror":"https://ror.org/058h74p94","display_name":"Nagasaki University","country_code":"JP","type":"education","lineage":["https://openalex.org/I43777268"]},"years":[1999]},{"institution":{"id":"https://openalex.org/I4390039382","ror":"https://ror.org/0173y3036","display_name":"VCU Massey Comprehensive Cancer Center","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I184840846","https://openalex.org/I4390039382"]},"years":[2016]},{"institution":{"id":"https://openalex.org/I4405284950","ror":"https://ror.org/04gpc9445","display_name":"Kansai Medical University Hospital","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4405284950"]},"years":[2017]},{"institution":{"id":"https://openalex.org/I63190737","ror":"https://ror.org/01y64my43","display_name":"University at Buffalo, State University of New York","country_code":"US","type":"education","lineage":["https://openalex.org/I63190737"]},"years":[2019]},{"institution":{"id":"https://openalex.org/I71395657","ror":"https://ror.org/04ww21r56","display_name":"Niigata University","country_code":"JP","type":"education","lineage":["https://openalex.org/I71395657"]},"years":[2026,2025,2024,2023,2022,2021,2020,2019,2018,2017,2016,2015,2014,2013,2011,2010,2008,2006,2005,2004,2003,2001,2000,1999,1998,1997,1993]},{"institution":{"id":"https://openalex.org/I82951845","ror":"https://ror.org/04ttjf776","display_name":"RMIT University","country_code":"AU","type":"education","lineage":["https://openalex.org/I82951845"]},"years":[2015]}],"last_known_institutions":[{"id":"https://openalex.org/I71395657","ror":"https://ror.org/04ww21r56","display_name":"Niigata University","country_code":"JP","type":"education","lineage":["https://openalex.org/I71395657"]}],"topics":[{"id":"https://openalex.org/T10858","display_name":"Clinical Nutrition and Gastroenterology","count":21,"subfield":{"id":"https://openalex.org/subfields/2916","display_name":"Nutrition and Dietetics"},"field":{"id":"https://openalex.org/fields/29","display_name":"Nursing"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10183","display_name":"Breast Cancer Treatment Studies","count":15,"subfield":{"id":"https://openalex.org/subfields/1306","display_name":"Cancer Research"},"field":{"id":"https://openalex.org/fields/13","display_name":"Biochemistry, Genetics and Molecular Biology"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T10619","display_name":"Esophageal Cancer Research and Treatment","count":13,"subfield":{"id":"https://openalex.org/subfields/2746","display_name":"Surgery"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T11134","display_name":"Breast Lesions and Carcinomas","count":13,"subfield":{"id":"https://openalex.org/subfields/2734","display_name":"Pathology and Forensic Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10397","display_name":"Nutrition and Health in Aging","count":10,"subfield":{"id":"https://openalex.org/subfields/2737","display_name":"Physiology (medical)"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}}],"topic_share":[{"id":"https://openalex.org/T11308","display_name":"Sphingolipid Metabolism and Signaling","value":7.84e-05,"subfield":{"id":"https://openalex.org/subfields/1312","display_name":"Molecular Biology"},"field":{"id":"https://openalex.org/fields/13","display_name":"Biochemistry, Genetics and Molecular Biology"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T13223","display_name":"Connective Tissue Growth Factor Research","value":7.71e-05,"subfield":{"id":"https://openalex.org/subfields/1312","display_name":"Molecular Biology"},"field":{"id":"https://openalex.org/fields/13","display_name":"Biochemistry, Genetics and Molecular Biology"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T10858","display_name":"Clinical Nutrition and Gastroenterology","value":6.63e-05,"subfield":{"id":"https://openalex.org/subfields/2916","display_name":"Nutrition and Dietetics"},"field":{"id":"https://openalex.org/fields/29","display_name":"Nursing"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T12465","display_name":"Cancer, Lipids, and Metabolism","value":5.57e-05,"subfield":{"id":"https://openalex.org/subfields/1306","display_name":"Cancer Research"},"field":{"id":"https://openalex.org/fields/13","display_name":"Biochemistry, Genetics and Molecular Biology"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T13097","display_name":"Male Breast Health Studies","value":4.85e-05,"subfield":{"id":"https://openalex.org/subfields/2730","display_name":"Oncology"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}}],"x_concepts":[{"id":"71924100","wikidata":"https://www.wikidata.org/wiki/Q11190","display_name":"Medicine","score":0.9923996329307556},{"id":"126322002","wikidata":"https://www.wikidata.org/wiki/Q11180","display_name":"Internal medicine","score":0.7557021379470825},{"id":"121608353","wikidata":"https://www.wikidata.org/wiki/Q12078","display_name":"Cancer","score":0.7174217700958252},{"id":"86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","score":0.6850735545158386},{"id":"142724271","wikidata":"https://www.wikidata.org/wiki/Q7208","display_name":"Pathology","score":0.5394943356513977}],"counts_by_year":[{"year":1989,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1990,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1992,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1993,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1995,"works_count":2,"oa_works_count":0,"cited_by_count":0},{"year":1997,"works_count":2,"oa_works_count":1,"cited_by_count":0},{"year":1998,"works_count":2,"oa_works_count":0,"cited_by_count":0},{"year":1999,"works_count":2,"oa_works_count":0,"cited_by_count":0},{"year":2000,"works_count":3,"oa_works_count":0,"cited_by_count":0},{"year":2001,"works_count":5,"oa_works_count":2,"cited_by_count":0},{"year":2002,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":2003,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":2004,"works_count":3,"oa_works_count":2,"cited_by_count":0},{"year":2005,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":2006,"works_count":6,"oa_works_count":2,"cited_by_count":0},{"year":2007,"works_count":2,"oa_works_count":1,"cited_by_count":0},{"year":2008,"works_count":2,"oa_works_count":0,"cited_by_count":0},{"year":2009,"works_count":3,"oa_works_count":1,"cited_by_count":0},{"year":2010,"works_count":3,"oa_works_count":1,"cited_by_count":0},{"year":2011,"works_count":4,"oa_works_count":1,"cited_by_count":0},{"year":2012,"works_count":1,"oa_works_count":0,"cited_by_count":66},{"year":2013,"works_count":4,"oa_works_count":3,"cited_by_count":62},{"year":2014,"works_count":11,"oa_works_count":1,"cited_by_count":69},{"year":2015,"works_count":6,"oa_works_count":2,"cited_by_count":73},{"year":2016,"works_count":9,"oa_works_count":4,"cited_by_count":63},{"year":2017,"works_count":4,"oa_works_count":2,"cited_by_count":49},{"year":2018,"works_count":6,"oa_works_count":3,"cited_by_count":60},{"year":2019,"works_count":4,"oa_works_count":3,"cited_by_count":69},{"year":2020,"works_count":5,"oa_works_count":2,"cited_by_count":86},{"year":2021,"works_count":5,"oa_works_count":3,"cited_by_count":87},{"year":2022,"works_count":5,"oa_works_count":4,"cited_by_count":79},{"year":2023,"works_count":6,"oa_works_count":5,"cited_by_count":112},{"year":2024,"works_count":2,"oa_works_count":2,"cited_by_count":78},{"year":2025,"works_count":3,"oa_works_count":3,"cited_by_count":110},{"year":2026,"works_count":1,"oa_works_count":1,"cited_by_count":62}],"display_name_alternatives":["KOYAMA, Yu","Y Koyama","Y. Koyama","YU KOYAMA","Yu KOYAMA","Yu Koyama"],"block_key":"y koyama","works_api_url":"https://api.openalex.org/works?filter=author.id:A5084936688","updated_date":"2026-11-08T12:57:04","created_date":"2016-06-24T00:00:00"}
