Journal of Clinical Oncology, Vol 21, Issue 1
(January), 2003: 78-84
© 2003 American Society for Clinical Oncology
Prognostic Factors and Clinical Outcomes in Children and Adolescents With Metastatic RhabdomyosarcomaA Report From the Intergroup Rhabdomyosarcoma Study IV
John C. Breneman,
Elizabeth Lyden,
Alberto S. Pappo,
Michael P. Link,
James R. Anderson,
David M. Parham,
Stephen J. Qualman,
Moody D. Wharam,
Sarah S. Donaldson,
Harold M. Maurer,
William H. Meyer,
K. Scott Baker,
Charles N. Paidas,
William M. Crist
From the Childrens Hospital Medical Center, Cincinnati, OH; University of Nebraska Medical Center, Omaha, NE; Hospital for Sick Children, Toronto, Ontario, Canada; Stanford University Medical Center, Stanford, CA; University of Arkansas, Little Rock, AR; Childrens Hospital of Columbus, Columbus, OH; Johns Hopkins Hospital, Baltimore, MD; University of Oklahoma Health Sciences Center, Oklahoma City, OK; University of Minnesota Cancer Center, Minneapolis, MN; and University of Missouri, Columbia, MO.
Address reprint requests to John C. Breneman, MD, Childrens Hospital Medical Center Cincinnati, Division of Radiation Oncology, 234 Goodman Street, ML 0757, Cincinnati OH 45219-0757, email: brenemjc{at}healthall.com, cc: smason{at}childrensoncologygroup.org.
Purpose: To identify risk factors associated with outcomes in children with metastatic rhabdomyosarcoma (RMS) treated on the fourth Intergroup Rhabdomyosarcoma Study (IRS-IV).
Patients and Methods: Patients with metastatic RMS were treated with one of two regimens that incorporated a window of either ifosfamide and etoposide (IE) with vincristine, dactinomycin, and cyclophosphamide (VAC) or vincristine, melphalan (VM) and VAC. Study end points were failure-free survival (FFS) and overall survival (OS). Clinical factors including age, histology, sites of primary and metastatic disease, and number of sites of metastatic disease were correlated with those end points.
Results: One hundred twenty-seven patients were eligible for analysis. The estimated 3-year OS and FFS for all patients were 39% and 25%, respectively. By univariate analysis, 3-year OS was significantly influenced by histology (47% for embryonal v 34% for all others, P = .026) and increasing number of metastatic sites (P = .028). By multivariate analysis, the presence of two or fewer metastatic sites was the only significant predictor (P = .007 and .006, respectively). The combination of embryonal histology with two or fewer metastatic sites identified a subgroup with 3-year FFS of 40% and OS of 47%.
Conclusion: Children with group IV RMS treated on the IRS-IV study had improved OS and FFS if they had two or fewer metastatic sites and embryonal histology. This favorable subset of patients has outcomes approaching those observed in selected patients with localized, nonmetastatic disease. Thus, these patients might not be appropriate candidates for regimens that include experimental agents with substantial toxicities or unproven antitumor activity.
Supported by Department of Health and Human Services (Washington, DC), United States Public Health Service grants no. CA-24507, CA-30138, CA-30969, CA-29139, CA-13539.

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