title: Philadelphia chromosome negative acute lymphoblastic leukemia preceding Philadelphia positive chronic myelogenous leukemia.
abstract: A patient with Philadelphia chromosome (Ph) negative acute lymphoblastic leukemia (ALL, FAB type L1) developed Ph-positive chronic myelogenous leukemia (CML) after more than 2 years in complete remission. Subsequently, Ph-positive lymphoblastic transformation occurred, which was again successfully treated. Thereafter, the CML state was interrupted twice more by blast crisis. The additional chromosomal abnormalities were atypical for Ph-positive CML. The course is interpreted as a possible example of the multistep development of CML. Blastic transformation occurring prior to the Ph chromosome has been reported in only two cases previously.
authors.affiliation: Department of Medicine, University Hospital, Umeå, Sweden.
authors.forename: P
authors.initials: P
authors.lastname: Hörnsten
authors.forename: I
authors.initials: I
authors.lastname: Nordenson
authors.forename: A
authors.initials: A
authors.lastname: Wahlin
mesh_terms: D000328:Adult; D001752:Blast Crisis / Q000235:genetics / Q000473:pathology; D002869:Chromosome Aberrations; D006801:Humans; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000188:drug therapy / Q000235:genetics / Q000473:pathology*; D015466:Leukemia, Myeloid, Chronic-Phase / Q000188:drug therapy / Q000235:genetics / Q000473:pathology*; D008297:Male; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000188:drug therapy / Q000235:genetics / Q000473:pathology*