Elevated levels of FGF2 have previously been measured in the serum of CML and AML patients (Aguayo et al., 2000; Aguayo et al., 2002), as well as in the bone marrow of AML patients, where it was reported to function as an autocrine promotor of proliferation (Bieker et al., 2003). The gene discussed is FGF2; the disease is acute myeloid leukemia.