Unexpectedly, B cell precursor leukemia cells harboring a BCR-ABL1 gene rearrangement do not depend on antigen receptor mediated survival signals.     ///    "However, upon inhibition of the BCR-ABL1 kinase activity by STI571, only leukemia cells expressing an antigen receptor are able to survive. "    ///    "Since resistance to STI571 is frequent in the therapy of BCR-ABL1(+) B cell precursor leukemia, antigen receptor signaling may represent a mechanism through which these cells can temporarily evade STI571-induced apoptosis. "    ///    Interference of BCR-ABL1 kinase activity with antigen receptor signaling in B cell precursor leukemia cells.. 