title: [Molecular analysis of chronic Philadelphia chromosome negative myeloid leukemia: study of 6 cases].
abstract: BACKGROUND
  Patients with Philadelphia negative (Ph-) chronic myeloid leukemia (CML) constitute a small proportion of the total number of patients with CML. Molecular analysis of these cases has permitted recognition that some cases present a breakpoint in the bcr region of chromosome 22, that is, the alteration constituting the substrate of the Ph chromosome. To date, the number of patients analyzed to this regard is low.
  
  
  METHODS
  Six patients with Ph negative CML who constituted part of a series of 96 patients diagnosed with CML over a period of 6 years were studied. Analysis of the BCR gene in the DNA of the leuko-concentrate of peripheral blood was carried out with the Southern Blot technique, using the 3' and 5' probes and Transprobe and the restriction enzymes Bgl II, Eco RI, Hind III and Bam HI. The principal clinical-hematological characteristics of the patients were analyzed.
  
  
  RESULTS
  Breakpoints were observed in the bcr region of chromosome 22 in 3 of the 6 patients, all of whom presented typical CML clinical-hematological features.
  
  
  CONCLUSIONS
  Half of the patients with Philadelphia negative (Ph-) chronic myeloid leukemia (CML) have a breakpoint in the bcr region of chromosome 22, a similar molecular pattern to the Ph positive CML and their clinical-hematological profile is indistinguishable from those with CML.
authors.affiliation: Escuela de Hematología Farreras-Valentí, Servicio de Hematología Clínica, y Hospital Clínic i Provincial, Universidad de Barcelona.
authors.forename: F
authors.initials: F
authors.lastname: Cervantes
authors.forename: A
authors.initials: A
authors.lastname: Urbano-Ispizua
authors.forename: A
authors.initials: A
authors.lastname: Pujades
authors.forename: F
authors.initials: F
authors.lastname: Bosch
authors.forename: J L
authors.initials: JL
authors.lastname: Vives-Corrons
authors.forename: E
authors.initials: E
authors.lastname: Montserrat
authors.forename: C
authors.initials: C
authors.lastname: Rozman
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002869:Chromosome Aberrations / Q000235:genetics*; D025063:Chromosome Disorders; D002892:Chromosomes, Human, Pair 22; D002908:Chronic Disease; D015342:DNA Probes; D005260:Female; D006801:Humans; D054438:Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009857:Oncogenes / Q000235:genetics*
chemical_list: D015342:DNA Probes
vernacular_title: Análisis molecular en la leucemia mieloide crónica cromosoma Filadelfia negativa: estudio de seis casos.