Here, we show the tropism and selectivity exhibited by Wt1-5 for Reh cells, a human acute lymphoblastic leukemia cell line, that have a higher expression of the cell surface Hsp90, Hsp70, Hsc70, PDI and αVβ3 as compared with their very low or absent expression in PBMCs. Here, WT1 is linked to acute lymphoblastic leukemia.