title: Persistence of chronic myelocytic leukemia despite deletion of rearranged bcr/c-abl sequences in blast crisis.
abstract: We report on a Ph+ chronic myelocytic leukemia (CML) case, cytogenetically characterized by the occurrence of a second Philadelphia (Ph) chromosome in lymphoid blast crisis of T cell lineage. In situ hybridization analyses showed a deletion of translocated c-abl sequences, present on the Ph during chronic state, from both Ph in acute state. Moreover, Southern blot analyses of blastic cells exhibited a rearrangement within bcr, but a deletion of 5' bcr sequences, and Northern blots failed to detect the hybrid 8.5 kb bcr/c-abl transcript usually observed in Ph+ CML.
authors.forename: C R
authors.initials: CR
authors.lastname: Bartram
authors.forename: J W
authors.initials: JW
authors.lastname: Janssen
authors.forename: R
authors.initials: R
authors.lastname: Becher
authors.forename: A
authors.initials: A
authors.lastname: de Klein
authors.forename: G
authors.initials: G
authors.lastname: Grosveld
mesh_terms: D001483:Base Sequence; D001752:Blast Crisis / Q000235:genetics*; D002872:Chromosome Deletion; D002892:Chromosomes, Human, Pair 22; D002899:Chromosomes, Human, Pair 9; D006801:Humans; D007951:Leukemia, Myeloid / Q000235:genetics* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009693:Nucleic Acid Hybridization; D009857:Oncogenes; D010677:Philadelphia Chromosome; D011995:Recombination, Genetic