Philadelphia chromosome and monosomy 7 in childhood acute lymphoblastic leukemia: A Pediatric Oncology Group study

C. Russo, A. Carroll, S. Kohler, M. Borowitz, M. Amylon, A. Homans, A. Kedar, J. Shuster, V. Land, W. Crist, J. Pullen, M. Link

Research output: Contribution to journalArticlepeer-review

61 Scopus citations


During an 8-year period, 3,638 children from institutions of the Pediatric Oncology Group (POG) were diagnosed with acute lymphoblastic leukemia (ALL). Fifty-seven patients had Philadelphia chromosome-positive (Ph1) ALL. Blast cells obtained at diagnosis from 13 of these 57 cases (23%) were also found to have partial or complete monosomy 7 (-7). This subgroup of children with Ph1/-7 ALL was comprised primarily of older males with early B-lineage ALL. Bone marrow specimens from six Ph1/-7 patients were studied further using the polymerase chain reaction and primers that flank the ALL, and chronic myelogenous leukemia breakpoints to determine the molecular characteristic of the 9;22 translocation. Rearrangements were detected in RNA from bone marrow and/or peripheral blood cells of six patients, although four were in hematologic remission at the time of the analysis. Five cases showed the ALL breakpoint, while one child with Ph1/-7 showed the chronic myelogenous leukemia breakpoint. The induction failure rate was much higher in this subgroup (31%) as compared with Ph1-negative cases, and the projected duration of event-free survival reflected the aggressive nature of this subgroup because no children are projected to remain in remission at 2 years. ALL with both the 9;22 translocation and -7 appears to represent a unique and previously undescribed subgroup of childhood ALL associated with a particularly adverse outcome. Leukemic transformation in such patients may involve the interaction of a dominant oncogene (Ph1) and a tumor suppressor gene (-7).

Original languageEnglish (US)
Pages (from-to)1050-1056
Number of pages7
Issue number5
StatePublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology


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