We expanded the primary cells from this ETV6/ABL rearranged case of ALL in SCID animals and analyzed them for expression of both ETV6/ABL and the normal ETV6 mRNA.     ///    "Thus, deletion of the second ETV6 allele is not necessary for the transformation to leukemia by ETV6/ABL.. "    ///    The second ETV6 allele is not necessarily deleted in acute leukemias with a ETV6/ABL fusion.. 