BCR and chronic myelogenous leukemia, BCR-ABL1 positive: While it is not fully understood whether MSCs isolated from leukemic cases carry the cytogenetic characteristics common to leukemic cells, previous studies reported the absence of t(9;22)(q34;q11) chromosomal translocation or BCR-ABL rearrangement in bone marrow MSCs obtained from cases with Philadelphia (Ph) chromosome-positive CML [35,36].