patients showed median survival of pre-PMF patients at 17.6 years compared with 7.2 years for overt PMF patients. However, another study showed 98% of pre-PMF patients were alive after 10 years from diagnosis and while overt PMF patients showed a median survival of 16.6 years, pre-PMF median survival was not able to be calculated as more than 50% of patients were still alive at the time of publication. History First described in 1976, pre-PMF was not introduced into the WHO's classification of tumors until 2001, and not formally classified as a distinct entity until the 2016 revision. References Cancer Myeloid neoplasia Rare cancers Idiopathic diseases