Purpose: The causes of the aggressive nature of BCR-ABL1-positive adult acute lymphoblastic leukemia (ALL) are unknown. To identify, at the submicroscopic level, oncogenic lesions that cooperate with BCR-ABL1 to induce ALL, we performed an investigation of genomic copy number alterations using single nucleotide polymorphism array, genomic polymerase chain reaction, and sequencing of candidate genes. Patients and Methods: Eighty-three patients with de novo adult Philadelphia chromosome (Ph) -positive ALL were enrolled onto institutional (n = 17) or Gruppo Italiano Malattie Ematologiche Maligne dell'Adulto Working Party delle Leucemia Acute (n = 66) clinical trials. Treatments included tyrosine kinase inhibitor (TKI) alone, conventional chemotherapy, or a combination of TKI and chemotherapy. Results: A 7p12 deletion of IKZF1 (Ikaros) was identified in 52 (63%) of 83 patients. The pattern of deletion varied among different patients, but the two most common deletion types were loss of exons 4 to 7 in 31 (37%) of 83 patients and loss of exons 2 to 7 in 17 (20%) of 83 patients. Disease-free survival (DFS) was shorter in patients with IKZF1 deletion versus patients with IKZF1 wild type (10 v 32 months, respectively; P = .02). Furthermore, a significantly shorter cumulative incidence of relapse was recorded in patients with IKZF1 deletion versus patients with IKZF1 wild type (10.1 v 56.1 months, respectively; P = .001). Multivariate analysis confirmed the negative prognostic impact of IKZF1 deletion on DFS (P = .04). Conclusion: We conclude that IKZF1 deletions are likely to be a genomic alteration that significantly affects the prognosis of Ph-positive ALL in adults. © 2009 by American Society of Clinical Oncology.
IKZF1 (Ikaros) deletions in BCR-ABL1-positive acute lymphoblastic leukemia are associated with short disease-free survival and high rate of cumulative incidence of relapse: A GIMEMA AL WP report / Martinelli, Giovanni; I., Iacobucci; C. T., Storlazzi; Vignetti, Marco; F., Paoloni; D., Cilloni; S., Soverini; A., Vitale; Chiaretti, Sabina; Cimino, Giuseppe; C., Papayannidis; S., Paolini; L., Elia; P., Fazi; Meloni, Giovanna; S., Amadori; G., Saglio; F., Pane; M., Baccarani; Foa, Roberto. - In: JOURNAL OF CLINICAL ONCOLOGY. - ISSN 0732-183X. - STAMPA. - 27:31(2009), pp. 5202-5207. [10.1200/jco.2008.21.6408]
IKZF1 (Ikaros) deletions in BCR-ABL1-positive acute lymphoblastic leukemia are associated with short disease-free survival and high rate of cumulative incidence of relapse: A GIMEMA AL WP report
MARTINELLI, GIOVANNI;VIGNETTI, Marco;CHIARETTI, sabina;CIMINO, Giuseppe;MELONI, Giovanna;FOA, Roberto
2009
Abstract
Purpose: The causes of the aggressive nature of BCR-ABL1-positive adult acute lymphoblastic leukemia (ALL) are unknown. To identify, at the submicroscopic level, oncogenic lesions that cooperate with BCR-ABL1 to induce ALL, we performed an investigation of genomic copy number alterations using single nucleotide polymorphism array, genomic polymerase chain reaction, and sequencing of candidate genes. Patients and Methods: Eighty-three patients with de novo adult Philadelphia chromosome (Ph) -positive ALL were enrolled onto institutional (n = 17) or Gruppo Italiano Malattie Ematologiche Maligne dell'Adulto Working Party delle Leucemia Acute (n = 66) clinical trials. Treatments included tyrosine kinase inhibitor (TKI) alone, conventional chemotherapy, or a combination of TKI and chemotherapy. Results: A 7p12 deletion of IKZF1 (Ikaros) was identified in 52 (63%) of 83 patients. The pattern of deletion varied among different patients, but the two most common deletion types were loss of exons 4 to 7 in 31 (37%) of 83 patients and loss of exons 2 to 7 in 17 (20%) of 83 patients. Disease-free survival (DFS) was shorter in patients with IKZF1 deletion versus patients with IKZF1 wild type (10 v 32 months, respectively; P = .02). Furthermore, a significantly shorter cumulative incidence of relapse was recorded in patients with IKZF1 deletion versus patients with IKZF1 wild type (10.1 v 56.1 months, respectively; P = .001). Multivariate analysis confirmed the negative prognostic impact of IKZF1 deletion on DFS (P = .04). Conclusion: We conclude that IKZF1 deletions are likely to be a genomic alteration that significantly affects the prognosis of Ph-positive ALL in adults. © 2009 by American Society of Clinical Oncology.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.