In France, for the year 2018, the estimated number of new cases of chronic myeloproliferative syndromes, excluding chronic myeloid leukemia, was 3,762, including 1,824 in men and 1,938 in women. Key points: Standardized net survival of 97% at 1 year and 85% at 5 years for individuals diagnosed between 2010 and 2015; Difference in 5-year net survival by age at diagnosis: 98% at age 40 and 77% at age 80; Better 5-year survival in women compared to men among those aged 60 and older; No change in survival between 2005 and 2015 regardless of age at diagnosis and duration of follow-up.