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Osteomyelofibrosis/-sclerosis: A histological and cytogenetic study on core biopsies of the bone marrow

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Summary

A combined histological and cytogenetic study was performed on the bone marrow in 33 patients with overt osteomyelofibrosis/-sclerosis (MF/OMS) and so called agnogenic myeloid metaplasia including blast crisis.

Histopathology of the plastic embedded samples of bone marrow showed an abnormal proliferation of megakaryopoiesis with conspicuous atypias of growth and maturation in addition to a neoplastic neutrophilic granulopoiesis, particularly in the early stages of MF. Thus a biphasic population of neoplastic hematopoiesis is postulated and this lesion is called chronic megakaryocytic-granulocytic myelosis (CMGM) with myelofibrosis — CMGM stage III — or with osteomyelosclerosis — CMGM stage IV. Initiation of fibrillogenesis, the most striking alteration of this disorder, is partially attributed to disorganization of megakaryopoiesis with abnormal proliferation and clustering around the sinuses and intraluminal growth, with subsequent obliteration of the vascular compartment.

Cytogenetic evaluation demonstrated the Philadelphia chromosome (Ph'-chromosome) in 93% of CGL and in 67% of MF/OMS, including cases with blast crisis. Unlike CGL and MF/OMS where a Ph'-chromosome is common, myelofibrosis of non-neoplastic origin and AML displayed no Ph'-chromosome. Further aberrations such as aneuploidy involved the C/D group chromosomes predominantly and were especially prominent in blast crisis (about 50%) with no significant differences in CGL and MF/OMS or in AML. Our results of chromosomal analysis, evaluated in close context with histopathology, show no fundamental differences between CGL and myeloproliferative disorders of mixed cellularity, i.e., chronic megakaryocytic-granulocytic myelosis (CMGM). For this reason the terminal stages of fibrotic and osteosclerotic lesions belong into these categories of CMGM or CGL respectively. In conclusion MF/OMS are final stages or subtypes of CML, carrying the same chromosomal marker and demonstrating remarkable atypias of the hematopoietic tissue suggestive of malignancy. The fibrotic/ osteosclerotic alteration itself is thought to represent a secondary nonneoplastic feature.

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Supported by the Deutsche Forschungsgemeinschaft (grant GE 121/20)

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Georgii, A., Thiele, J. & Vykoupil, K.F. Osteomyelofibrosis/-sclerosis: A histological and cytogenetic study on core biopsies of the bone marrow. Virchows Arch. A Path. Anat. and Histol. 389, 269–286 (1980). https://doi.org/10.1007/BF00430655

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