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Abstract
Overt myelofibrosis in bone marrow biopsies as a diagnostic postulate in cIMF has been discarded only recently by the WHO. Therefore, only a few studies have been performed on the evolution of myelofibrosis in "prefibrotic" cIMF by means of sequential bone marrow biopsies. We carried out this study on 38 patients, split up into two groups, A and B according to treatment modalities, to evaluate the dynamics and frequency of myelofibrosis in both groups. Our results indicate a step-wise development of myelofibrosis from a "prefibrotic" to a "classical" cIMF, as 75-80% of the respective patients in both groups progressed to myelofibrosis. However, this evolution seems to be heterogeneous and unpredictable in individual patients, since myelofibrosis could be seen as early as less than 2 years after diagnosis in 12/38 (31.6%) patients, whereas 3 patients remained "prefibrotic" even after up to 6 years of follow-up.
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