title: Circulating granulocytic and erythroid progenitor cells in chronic granulocytic leukaemia.
abstract: We used a standard methyl cellulose method to assay erythroid progenitor cells in the blood of 35 patients with untreated CGL and of 18 normal controls. In 28 patients we simultaneously assayed granulocyte/monocyte committed progenitor cells (CFU-c) by an agar method. Circulating erythroid burst-forming units (BFU-e) in CGL were increased above normal by a factor of about 180; CFU-c were increased by a factor of about 9000. Both BFU-e and CFU-c numbers were linearly related to the total leucocyte count in individual patients but not to numbers of circulating blast cells. There was a positive correlation in individual patients between CFU-c and BFU-e numbers. Circulating BFU-e and erythroid colony-forming cells (CFU-e) were unable to proliferate in vitro in the absence of erythropoietin. We conclude that erythroid progenitor cells are involved in the 'clonal expansion' that characterizes CGL, but apparently to a lesser extent than are granulocyte/moonocyte progenitor cells.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D003114:Colony-Forming Units Assay; D004912:Erythrocytes; D005260:Female; D006098:Granulocytes; D006412:Hematopoietic Stem Cells; D006801:Humans; D007951:Leukemia, Myeloid / Q000097:blood*; D007958:Leukocyte Count; D008297:Male; D008875:Middle Aged