| Abstract: |
Monosomy 7 or deletions of 7q are associated with many myeloid disorders; however, the significance of such abnormalities in childhood acute lymphoblastic leukemia (ALL) is unknown. Among 1880 children with ALL, 75 (41%) had losses involving chromosome 7, 16 (21%) with monosomy 7, 41 (55%) with losses of 7p (del(7p)), 16 (21%) with losses of 7q (del(7q)), and two (3%) with losses involving both arms. Patients with losses involving chromosome 7 were more likely to be ≥10 years old, National Cancer Institute (NCI) poor risk, and hypodiploid than patients lacking this abnormality. Patients with or without these abnormalities had similar early response to induction therapy. Event-free survival (EFS) and survival for patients with monosomy 7 (P<0.0001 and P=0.0007, respectively) or del(7p) (P<0.0001 and P=0.0001, respectively), but not of patients with del(7q), were significantly worse than those of patients lacking these abnormalities. The poorer EFS was maintained after adjustment for a Philadelphia (Ph) chromosome, NCI risk status, ploidy, or an abnormal 9p. However, the impact on survival was not maintained for monosomy 7 after adjustment for a Ph. These results indicate that the critical region of loss of chromosome 7 in pediatric ALL may be on the p-arm. © 2004 Nature Publishing Group All rights reserved. |
| Keywords: |
cancer survival; child; controlled study; preschool child; child, preschool; major clinical study; genetics; mortality; chromosome 9p; risk factor; acute lymphoblastic leukemia; groups by age; cancer center; acute lymphocytic leukemia; childhood leukemia; chromosome deletion; diploidy; chromosome 7p; chromosome 7q; philadelphia 1 chromosome; chromosome 7; monosomy; chromosomes, human, pair 7; leukemia, lymphocytic, acute, l1; monosomy 7; humans; prognosis; human; priority journal; article; childhood acute lymphoblastic leukemia; deletion 7p
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