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Ospedale Borgo Roma, Unità di Ematologia","Verona",{"type":40,"coordinates":334},[335,336],10.9938,45.43854,{"lat":336,"lon":335},[339,341],{"name":10,"role":24,"phone":10,"phoneExt":10,"email":340},"massimiliano.bonifacio@univr.it",{"name":342,"role":48,"phone":10,"phoneExt":10,"email":10},"Massimiliano Bonifacio, MD",{"facility":344,"status":138,"city":345,"state":10,"zip":10,"country":346,"countryCode":347,"cosmosGeoPoint":348,"geoPoint":352,"contacts":353},"IDIBAPS, Hospital clinic","Barcelona","Spain","ES",{"type":40,"coordinates":349},[350,351],2.15899,41.38879,{"lat":351,"lon":350},[354,356],{"name":355,"role":24,"phone":10,"phoneExt":10,"email":10},"Alberto Alvarez-Llaran",{"name":357,"role":48,"phone":10,"phoneExt":10,"email":10},"Alberto Alvarez-Llaran, MD",{"facility":359,"status":138,"city":360,"state":10,"zip":10,"country":346,"countryCode":347,"cosmosGeoPoint":361,"geoPoint":365,"contacts":366},"12 Octubre University Hospital","Madrid",{"type":40,"coordinates":362},[363,364],-3.70256,40.4165,{"lat":364,"lon":363},[367],{"name":368,"role":48,"phone":10,"phoneExt":10,"email":10},"Gonzalo Carrno Gomez-Tarragona, MD",{"facility":370,"status":33,"city":371,"state":10,"zip":10,"country":372,"countryCode":373,"cosmosGeoPoint":374,"geoPoint":378,"contacts":379},"Guy's and St. Thomas' NHS Foundation Trust","London","United Kingdom","UK",{"type":40,"coordinates":375},[376,377],-0.12574,51.50853,{"lat":377,"lon":376},[380],{"name":381,"role":48,"phone":10,"phoneExt":10,"email":10},"Claire Harrison, MD",{"type":383,"investigatorFullName":10,"investigatorTitle":10,"investigatorAffiliation":10,"oldNameTitle":10,"oldOrganization":10},"SPONSOR","100608608","a-eln-multicenter-study-on-phenotypic-evolution-and-clinical-outcomes-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":396,"type":397},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).",[401,402],"Polycythemia Vera","Thrombocythemia","2025-12-19",{"date":405,"type":406},"2025-12-26","ACTUAL",{"date":408,"type":406},"2025-12-01",{"date":410,"type":397},"2026-07-31",{"name":5,"class":6},25]