Abstract

Cytogenetic studies were performed on nine patients with myelofibrosis. Mononuclear cells from the peripheral blood were cultured for two days in the presence of human placenta-conditioned medium (HPCM) prior to the preparation of metaphases. Two patients showed abnormal clones. In one of them the Y chromosome was missing. In the other patient the abnormal clone was characterized by the involvement of the chromosomes 7 and 9 (46,XX,7q-,-9,+mar). The significance of cytogenetically abnormal circulating hemopoietic precursor cells in patients with myelofibrosis is discussed.

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