HSP90AB1 and acute lymphoblastic leukemia: 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.