- Heterogenic molecular basis for loss of ABL1-BCR transcription: deletions in der(9)t(9;22) and variants of standard t(9;22) in BCR-ABL1-positive chronic myeloid leukemia. Loncarevic, I.F., Römer, J., Starke, H., Heller, A., Bleck, C., Ziegler, M., Fiedler, W., Liehr, T., Clement, J.H., Claussen, U. Genes Chromosomes Cancer (2002)