Abstract
Investigating 208 patients with acute haematological malignancies, we found that stem cell factor receptor (SCFR) was expressed on high numbers of blast cells from the vast majority of patients (93%) with refractory anaemia with excess of blasts in transformation. SCFR was also detected in 62% of AMLs, in which it was directly associated to the expression of CD7, interleukin 6 receptor and CD34, and inversely to that of CD11b and CD14. SCFR-positive cases were preferentially represented in AML-M1 (70%) and in AML-M2 (83%) subsets, whereas only 45% of the remaining samples (M3-M4-M5) exhibited SCFR positively. Interestingly, 50% of cases with acute promyelocytic leukaemia expressed SCFR and this molecule was heterogenously regulated by in vitro treatment with all-trans retinoic acid.
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