title: Deletion of sequences flanking the t(9;22) breakpoint: a secondary genetic event associated with loss of cytogenetic response to interferon in a Philadelphia-positive chronic myeloid leukaemia patient.
abstract: We present a Ph-positive chronic myeloid leukaemia patient who lost a complete cytogenetic response (CCR) of 23 months duration at the time of detection of a deletion, not previously observed, of chromosomes 9 and 22 sequences flanking the translocation breakpoint on the derivate 9 chromosome. To our knowledge, this is the first case in which a deletion at the t(9;22) breakpoint has arisen as a secondary genetic alteration produced after formation of the t(9;22) translocation. It remains to be determined whether this genetic abnormality has the same prognostic importance as when observed at diagnosis.
authors.affiliation: GEMOLAB Laboratory and Haematology Department, Clínica Ruber, C/Juan Vigón no. 5, 28003 Madrid, Spain. gemolab@wanadoo.es
authors.forename: Eva
authors.initials: E
authors.lastname: Arranz
authors.forename: Juan José
authors.initials: JJ
authors.lastname: Gil-Fernández
authors.forename: Soraya
authors.initials: S
authors.lastname: Ramiro
authors.forename: Carlos
authors.initials: C
authors.lastname: Blas
authors.forename: Mónica
authors.initials: M
authors.lastname: Renedo
authors.forename: Adrián
authors.initials: A
authors.lastname: Alegre
authors.forename: Antonio
authors.initials: A
authors.lastname: Escudero
authors.forename: Jose María
authors.initials: JM
authors.lastname: Fernández-Rañada
mesh_terms: D000970:Antineoplastic Agents / Q000627:therapeutic use; D002872:Chromosome Deletion; D002892:Chromosomes, Human, Pair 22 / Q000235:genetics*; D002899:Chromosomes, Human, Pair 9 / Q000235:genetics*; D004351:Drug Resistance; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D000077190:Interferon alpha-2; D016898:Interferon-alpha / Q000627:therapeutic use; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000188:drug therapy / Q000235:genetics*; D008875:Middle Aged; D011994:Recombinant Proteins; D014178:Translocation, Genetic
chemical_list: D000970:Antineoplastic Agents; D000077190:Interferon alpha-2; D016898:Interferon-alpha; D011994:Recombinant Proteins