Here, we show that CCN1 is expressed in two AML cell lines (U937 and Kasumi-1) and in AML bone marrow samples but not in other leukemia cell lines, such as Jurkat (T-ALL), K562 (CML), CEM (T-ALL) or HL-60 (AML) cells. The gene discussed is CCN1; the disease is acute myeloid leukemia.