Acquisition of secondary structural chromosomal changes in pediatric ewing sarcoma is a probable prognostic factor for tumor response and clinical outcome

Autor: Jeremy A. Squire, Kwan Ng, Paul S. Thorner, Oswaldo C. Ramirez, Zong Mei Zhang, Jane Bayani, Poul H. Sorensen, Mark T. Greenberg, Paula Marrano, Maria Zielenska
Rok vydání: 2001
Předmět:
Zdroj: Cancer. 91:2156-2164
ISSN: 1097-0142
0008-543X
DOI: 10.1002/1097-0142(20010601)91:11<2156::aid-cncr1244>3.0.co;2-i
Popis: BACKGROUND The Ewing sarcoma (ES) group of tumors commonly have the t(11;22)(q24;q12) or other rearrangements involving 22q12. In addition to these consistent aberrations, both numeric and structural aberrations have been reported: namely gains of chromosomes 8 and 12, the unbalanced translocation t(1;16), and deletions at the short arm of chromosome 1. METHODS To evaluate the frequency and to study the prognostic implications of some of these aberrations in children, the authors performed a pilot study of 26 ES pediatric patients by classic cytogenetics and/or interphase fluorescence in situ hybridization (FISH) and compared these data with clinical parameters. RESULTS Gains of chromosomes 8 and 12 were detected, by interphase FISH, in 48% (10 of 21) and 38% (6 of 16) of the tumors, respectively, and this was not significant with respect to treatment response. Statistical analysis revealed that the presence of additional secondary structural chromosomal aberrations was associated with an unfavorable outcome (P = 0.0034 as an independent prognostic value as an unfavorable marker). Presence of metastasis at diagnosis also was found to be associated with poor outcome (P = 0.0131). Spectral karyotyping analysis was shown to facilitate the detection of more complex structural chromosomal aberrations in a representative ES tumor. CONCLUSIONS It is important to determine whether additional structural chromosomal aberrations are present in ES tumors because it appears that a more complex karyotype with multiple chromosomal aberrations is associated with poor outcome in ES. Cancer 2001;91:2156–64. © 2001 American Cancer Society.
Databáze: OpenAIRE
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