While no myeloid promoter fragment could be detected in Hep3B, 1F6 and 1F6-pcDNA3 cells (Figure 7, lanes 4–6), high levels of myeloid promoter fragments were observed in 1F6 clones overexpressing 18kD and ALL bFGF isoforms (Figure 7, lanes 7–10). Here, FGF2 is linked to acute lymphoblastic leukemia.