Interest of CALR Allele Burden in Diagnosis and Follow-up of Patients With CALR Mutated Myeloproliferative Syndromes (CALRSUIVI)

adults (age ≥18 years),

affiliated to the national social security system,

with CALR mutated myeloproliferative neoplasm diagnosed between 2006 - 2020,

for which at least one sample is available at the time of diagnosis or before cytoreductive treatment,