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Ospedale Borgo Roma, Unità di Ematologia","Verona",{"type":40,"coordinates":315},[316,317],10.9938,45.43854,{"lat":317,"lon":316},[320,322],{"name":10,"role":24,"phone":10,"phoneExt":10,"email":321},"massimiliano.bonifacio@univr.it",{"name":323,"role":62,"phone":10,"phoneExt":10,"email":10},"Massimiliano Bonifacio, MD",{"facility":325,"status":65,"city":326,"state":10,"zip":10,"country":327,"countryCode":328,"cosmosGeoPoint":329,"geoPoint":333,"contacts":334},"IDIBAPS, Hospital clinic","Barcelona","Spain","ES",{"type":40,"coordinates":330},[331,332],2.15899,41.38879,{"lat":332,"lon":331},[335,337],{"name":336,"role":24,"phone":10,"phoneExt":10,"email":10},"Alberto Alvarez-Llaran",{"name":338,"role":62,"phone":10,"phoneExt":10,"email":10},"Alberto Alvarez-Llaran, MD",{"facility":340,"status":65,"city":341,"state":10,"zip":10,"country":327,"countryCode":328,"cosmosGeoPoint":342,"geoPoint":346,"contacts":347},"12 Octubre University Hospital","Madrid",{"type":40,"coordinates":343},[344,345],-3.70256,40.4165,{"lat":345,"lon":344},[348],{"name":349,"role":62,"phone":10,"phoneExt":10,"email":10},"Gonzalo Carrno Gomez-Tarragona, MD",{"facility":351,"status":65,"city":352,"state":10,"zip":10,"country":353,"countryCode":354,"cosmosGeoPoint":355,"geoPoint":359,"contacts":360},"Guy's and St. Thomas' NHS Foundation Trust","London","United Kingdom","UK",{"type":40,"coordinates":356},[357,358],-0.12574,51.50853,{"lat":358,"lon":357},[361],{"name":362,"role":62,"phone":10,"phoneExt":10,"email":10},"Claire Harrison, MD",{"type":364,"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":377,"type":378},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).",[382,383],"Polycythemia Vera","Thrombocythemia","2026-07-08",{"date":386,"type":387},"2026-07-09","ACTUAL",{"date":389,"type":387},"2025-12-01",{"date":391,"type":378},"2026-12-31",{"name":5,"class":6},24]