Common and variant gene fusions predict distinct clinical phenotypes in rhabdomyosarcoma

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
K M KellyFrederic G Barr

Abstract

We evaluated the clinical features of the common PAX3-FKHR and variant PAX7-FKHR gene fusions observed in rhabdomyosarcoma. Reverse-transcriptase polymerase chain reaction (RT-PCR) assays were used to detect the gene fusions in 34 cases of rhabdomyosarcoma. Clinical data were obtained retrospectively and compared with the molecular results. The PAX3-FKHR and PAX7-FKHR gene fusions were present in tumors from 18 and 16 patients, respectively. The group with a PAX7-FKHR fusion was younger (P = .01) and presented more often with an extremity lesion (82% v 22%; P = .001). PAX7-FKHR tumors were more often localized than PAX3-FKHR tumors (P = .03). In patients with metastatic disease at diagnosis, the patterns were different: PAX7-FKHR patients had metastatic disease that involved only bone (n = 2) and distant nodes (n = 2), while the PAX3-FKHR group had multiple sites involved, including bone (n = 7), marrow (n = 7), lungs (n = 3), distant nodes (n = 2), skin (n = 1), and brain (n = 1). No significant difference in relapse rate was observed. A trend toward improved overall survival in the PAX7-FKHR group was noted (P = .09). Event-free survival for this PAX7-FKHR group was significantly longer (P = .04). Our results suggest that the...Continue Reading

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