Shalapour et al. [10] and Menendez et al. [11] identified the presence of oncogenic fusion transcripts, such as TEL-AML1, E2A-PBX1, and MLL rearrangements, in MSCs isolated from cases with B-lineage acute lymphoblastic leukemia (B-ALL). This evidence concerns the gene PBX1 and acute lymphoblastic leukemia.