Clonal granulocytes and bone marrow cells in the cellular phase of agnogenic myeloid metaplasia.

Myelofibrosis with myeloid metaplasia (MMM) belongs to the group of myeloproliferative syndromes. It is characterized by a sustained proliferation of megakaryocytes and increased medullary reticulin fibers. Until now the cellular phase at onset of the disease has not been analyzed for clonality of the hematopoietic cells. In this study we used X-linked restriction length polymorphism (RFLP) analysis to investigate the clonality of granulocytes and bone marrow cells from the cellular phase and advanced stages of the disease. In each of 12 heterozygous females, monoclonality of granulocytes or total bone marrow cells could be demonstrated. These results show that the cellular phase represents a monoclonal, and hence a probably neoplastic, proliferation of a pluripotent stem cell. The monoclonality of granulocytes present at the onset of disease should allow analysis of DNA of these easily accessible peripheral cells for the detection of specific clonal aberrations.

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