Description of the clinical characteristics of chronic myeloproliferative neoplasms (MPNs)

First report of the colombian registry of MPNs

Abstract

Introduction and objectives: chronic MPNs are relatively rare, with incidences varying between 0.47-1.03 / 100 000 inhabitants. The first report of the work of the Colombian registry of chronic MPNs, whose objective is to describe the clinical characteristics of these patients in our country, is presented.

Materials and methods: descriptive observational, multicenter, retrospective and prospective study in eight centers of the country, from April 2013 to December 2014. Qualitative variables are presented with absolute and relative frequencies, and the quantitative ones are summarized in measures of central tendency and dispersion.

Results: eleven centers were approved; 8 admitted patients. In the first 179 cases reported, 50% were men; the average age at diagnosis was 58.7 years (range 19-92). Ninety-three present essential thrombocythemia (ET); 55, polycythemia vera (PV); and 31, myelofibrosis (MF). 41% had splenomegaly at diagnosis; 20% had thrombotic complications, and 12.85%, bleeding. JAK was performed in only 57.5%. Of them, in 53.5% was positive, especially in only 60% of the PV. 8% of the cases had no bone marrow study; 29.3% had some degree of fibrosis. The most frequent finding was megakaryocytic hyperplasia in 59.78%. More than 50% of patients were symptomatic at diagnosis. Only 11% did not receive pharmacological treatment, being the most frequent hydroxyurea in 149 cases and ASA in 79, with an average follow-up of 52.6 months. 97.21% of patients are alive.

Conclusions: the findings suggest that some characteristics of chronic MPNs could be different from those reported in other series, which validates the importance of the effort to collect local information.