CancerVolume 76, Issue 6 p. 1073-1085 Original ArticleFree Access Classification of rhabdomyosarcomas and related sarcomas. Pathologic aspects and proposal for a new classification-an intergroup rhabdomyosarcoma study William A. Newton Jr. M.D., Corresponding Author William A. Newton Jr. M.D. Children's Cancer Group, Arcadia, California Intergroup Rhabdomyosarcoma Pathology Center, Columbus, OhioIRS Pathology Center, Children's Hospital, Columbus, OH 43205===Search for more papers by this authorEdmund A. Gehan Ph.D., Edmund A. Gehan Ph.D. Pediatric Intergroup Statistical Center, Washington, DCSearch for more papers by this authorBruce L Webber M.D., Bruce L Webber M.D. Pediatric Oncology Group, Chicago, IllinoisSearch for more papers by this authorHenry B. Marsden M.D., Henry B. Marsden M.D. International Socxiety for pediatric OncologySearch for more papers by this authorA. J. M. van Unnik M.D., A. J. M. van Unnik M.D. International Socxiety for pediatric OncologySearch for more papers by this authorAla B. Hamoudi M.D., Ala B. Hamoudi M.D. Children's Cancer Group, Arcadia, California Intergroup Rhabdomyosarcoma Pathology Center, Columbus, OhioSearch for more papers by this authorMaria C. Tsokos M.D., Maria C. Tsokos M.D. National Cancer Institute, Bethesda, MarylandSearch for more papers by this authorHiroyuki Shimada M.D., Hiroyuki Shimada M.D. Children's Cancer Group, Arcadia, CaliforniaSearch for more papers by this authorDieter Harms M.D., Dieter Harms M.D. German-Italian Cooperative Soft Tissue Sarcomas Study, Columbus, OhioSearch for more papers by this authorDietmar Schmidt M.D., Dietmar Schmidt M.D. German-Italian Cooperative Soft Tissue Sarcomas Study, Columbus, OhioSearch for more papers by this authorVito Ninfo M.D., Vito Ninfo M.D. German-Italian Cooperative Soft Tissue Sarcomas Study, Columbus, OhioSearch for more papers by this authorAndrea O. Cavazzana M.D., Andrea O. Cavazzana M.D. German-Italian Cooperative Soft Tissue Sarcomas Study, Columbus, OhioSearch for more papers by this authorFrank Gonzalez-Crussi M.D., Frank Gonzalez-Crussi M.D. Pediatric Oncology Group, Chicago, IllinoisSearch for more papers by this authorDavid M. Parham M.D., David M. Parham M.D. Pediatric Oncology Group, Chicago, IllinoisSearch for more papers by this authorHerbert M. Reiman M.D., Herbert M. Reiman M.D. Children's Cancer Group, Arcadia, CaliforniaSearch for more papers by this authorLina Asmar Ph.D., Lina Asmar Ph.D. Pediatric Intergroup Statistical Center, Washington, DCSearch for more papers by this authorMohan S. Beltangady Ph.D., Mohan S. Beltangady Ph.D. Pediatric Intergroup Statistical Center, Washington, DCSearch for more papers by this authorNancy E. Sachs M.S., Nancy E. Sachs M.S. Children's Cancer Group, Arcadia, California Intergroup Rhabdomyosarcoma Pathology Center, Columbus, OhioSearch for more papers by this authorTimothy J. Triche M.D., Ph.D., Timothy J. Triche M.D., Ph.D. Children's Cancer Group, Arcadia, CaliforniaSearch for more papers by this authorHarold M. Maurer M.D., Harold M. Maurer M.D. Pediatric Oncology Group, Chicago, IllinoisSearch for more papers by this author William A. Newton Jr. M.D., Corresponding Author William A. Newton Jr. M.D. Children's Cancer Group, Arcadia, California Intergroup Rhabdomyosarcoma Pathology Center, Columbus, OhioIRS Pathology Center, Children's Hospital, Columbus, OH 43205===Search for more papers by this authorEdmund A. Gehan Ph.D., Edmund A. Gehan Ph.D. Pediatric Intergroup Statistical Center, Washington, DCSearch for more papers by this authorBruce L Webber M.D., Bruce L Webber M.D. Pediatric Oncology Group, Chicago, IllinoisSearch for more papers by this authorHenry B. Marsden M.D., Henry B. Marsden M.D. International Socxiety for pediatric OncologySearch for more papers by this authorA. J. M. van Unnik M.D., A. J. M. van Unnik M.D. International Socxiety for pediatric OncologySearch for more papers by this authorAla B. Hamoudi M.D., Ala B. Hamoudi M.D. Children's Cancer Group, Arcadia, California Intergroup Rhabdomyosarcoma Pathology Center, Columbus, OhioSearch for more papers by this authorMaria C. Tsokos M.D., Maria C. Tsokos M.D. National Cancer Institute, Bethesda, MarylandSearch for more papers by this authorHiroyuki Shimada M.D., Hiroyuki Shimada M.D. Children's Cancer Group, Arcadia, CaliforniaSearch for more papers by this authorDieter Harms M.D., Dieter Harms M.D. German-Italian Cooperative Soft Tissue Sarcomas Study, Columbus, OhioSearch for more papers by this authorDietmar Schmidt M.D., Dietmar Schmidt M.D. German-Italian Cooperative Soft Tissue Sarcomas Study, Columbus, OhioSearch for more papers by this authorVito Ninfo M.D., Vito Ninfo M.D. German-Italian Cooperative Soft Tissue Sarcomas Study, Columbus, OhioSearch for more papers by this authorAndrea O. Cavazzana M.D., Andrea O. Cavazzana M.D. German-Italian Cooperative Soft Tissue Sarcomas Study, Columbus, OhioSearch for more papers by this authorFrank Gonzalez-Crussi M.D., Frank Gonzalez-Crussi M.D. Pediatric Oncology Group, Chicago, IllinoisSearch for more papers by this authorDavid M. Parham M.D., David M. Parham M.D. Pediatric Oncology Group, Chicago, IllinoisSearch for more papers by this authorHerbert M. Reiman M.D., Herbert M. Reiman M.D. Children's Cancer Group, Arcadia, CaliforniaSearch for more papers by this authorLina Asmar Ph.D., Lina Asmar Ph.D. Pediatric Intergroup Statistical Center, Washington, DCSearch for more papers by this authorMohan S. Beltangady Ph.D., Mohan S. Beltangady Ph.D. Pediatric Intergroup Statistical Center, Washington, DCSearch for more papers by this authorNancy E. Sachs M.S., Nancy E. Sachs M.S. Children's Cancer Group, Arcadia, California Intergroup Rhabdomyosarcoma Pathology Center, Columbus, OhioSearch for more papers by this authorTimothy J. Triche M.D., Ph.D., Timothy J. Triche M.D., Ph.D. Children's Cancer Group, Arcadia, CaliforniaSearch for more papers by this authorHarold M. Maurer M.D., Harold M. Maurer M.D. Pediatric Oncology Group, Chicago, IllinoisSearch for more papers by this author First published: 15 September 1995 https://doi.org/10.1002/1097-0142(19950915)76:6<1073::AID-CNCR2820760624>3.0.CO;2-LCitations: 405AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract Background. There is a need to develop a single prognostically significant classification of rhabdomyosarcomas (RMS) and other related tumors of children, adolescents, and young adults which would be a current guide for their diagnosis, allow valid comparison of outcomes between protocols carried out anywhere in the world, and should enhance recognition of prognostic subsets. Method. Sixteen pathologists from eight pathology groups, representing six countries and several cooperative groups, classified by four histopathologic classification schemes 800 representative tumors of the 999 eligible cases treated on Intergroup Rhabdomyosarcoma Study II. Each tumor was classified according to each of the four systems by each of the pathologists. In addition, two independent subsamples of 200 of the 800 patients were reviewed according to the new system, so that 343 distinct patients were reviewed once, and 57 of these twice. Results. A study of the survival rates of all subtypes in the sample of 800 patients led to the formation of a new system. This was tested on two independent subsets of 200 of the original cases and found to be reproducible and predictive of outcome by univariate analysis. A multivariate analysis of the 343 patients classified according to the new system indicated that a survival model including pathologic classification and known prognostic factors of primary site, clinical group, and tumor size was significantly better at predicting survival than a model with only the known prognostic factors. Conclusion. This new classification, termed International Classification of Rhabdomyosarcoma (ICR) by the authors, was reproducible and predictive of outcome among patients with differing histologies treated uniformly on the Intergroup Rhabdomyosarcoma II protocols. We believe it should be utilized by all pathologists and cooperative groups to classify rhabdomyosarcomas in order to provide comparability among and within multi-institutional studies. Cancer 1995;76:1073-85. Citing Literature Volume76, Issue615 September 1995Pages 1073-1085 ReferencesRelatedInformation