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Ospedale Borgo Roma, Unità di Ematologia","Verona",{"type":39,"coordinates":331},[332,333],10.9938,45.43854,{"lat":333,"lon":332},[336,338],{"name":10,"role":24,"phone":10,"phoneExt":10,"email":337},"massimiliano.bonifacio@univr.it",{"name":339,"role":47,"phone":10,"phoneExt":10,"email":10},"Massimiliano Bonifacio, MD",{"facility":341,"status":135,"city":342,"state":10,"zip":10,"country":343,"cosmosGeoPoint":344,"geoPoint":348,"contacts":349},"IDIBAPS, Hospital clinic","Barcelona","Spain",{"type":39,"coordinates":345},[346,347],2.15899,41.38879,{"lat":347,"lon":346},[350,352],{"name":351,"role":24,"phone":10,"phoneExt":10,"email":10},"Alberto Alvarez-Llaran",{"name":353,"role":47,"phone":10,"phoneExt":10,"email":10},"Alberto Alvarez-Llaran, MD",{"facility":355,"status":135,"city":356,"state":10,"zip":10,"country":343,"cosmosGeoPoint":357,"geoPoint":361,"contacts":362},"12 Octubre University Hospital","Madrid",{"type":39,"coordinates":358},[359,360],-3.70256,40.4165,{"lat":360,"lon":359},[363],{"name":364,"role":47,"phone":10,"phoneExt":10,"email":10},"Gonzalo Carrno Gomez-Tarragona, MD",{"facility":366,"status":33,"city":367,"state":10,"zip":10,"country":368,"cosmosGeoPoint":369,"geoPoint":373,"contacts":374},"Guy's and St. Thomas' NHS Foundation Trust","London","United Kingdom",{"type":39,"coordinates":370},[371,372],-0.12574,51.50853,{"lat":372,"lon":371},[375],{"name":376,"role":47,"phone":10,"phoneExt":10,"email":10},"Claire Harrison, MD",{"type":378,"investigatorFullName":10,"investigatorTitle":10,"investigatorAffiliation":10,"oldNameTitle":10,"oldOrganization":10},"SPONSOR","100608608",false,"NCT07203768","A ELN-Multicenter Study on Phenotypic Evolution and Clinical Outcomes","Unmasking Polycythemia Vera in Long-Standing Essential Thrombocythemia: A ELN-Multicenter Study on Phenotypic Evolution and Clinical Outcomes","ET2PV","Inclusion Criteria:\n\n\\- ET patients (diagnosed according to \"International consensus classification of myeloid neoplasms and acute leukemias - 2022\" criteria) who are JAK2V617F positive and have progressed to PV (diagnosed according to \"International consensus classification of myeloid neoplasms and acute leukemias - 2022\" criteria) by 31\u002F12\u002F2020. The date of PV diagnosis will be defined as the index date and this group of patients will be defined as ET-to-PV cases.\n\nExclusion Criteria:\n\n* None.","ALL","18 Years","100 Years",{"count":390,"type":391},678,"ESTIMATED","OBSERVATIONAL","International multicenter retrospective observational study consisting of two parts: a nested case-control study (part A) and a comparative retrospective cohort study (part B).",[395,396],"Polycythemia Vera","Thrombocythemia","2025-12-19",{"date":399,"type":400},"2025-12-26","ACTUAL",{"date":402,"type":400},"2025-12-01",{"date":404,"type":391},"2026-07-31",{"name":5,"class":6},25]