title: Detection of PAX3/PAX7-FKHR fusion transcripts in rhabdomyosarcoma and other small round cell tumors by 1-step reverse transcriptase polymerase chain reaction: a novel tool for diagnosis and differentiation.
abstract: Rhabdomyosarcoma (RMS) is one of the most frequent soft tissue sarcomas in children. It is sometimes difficult to distinguish it from other small round cell tumors (SRCTs) depending on microscopic observations; although their treatment and prognosis varied widely, the same happens between alveolar RMS (ARMS) and embryonal RMS (ERMS). The role of PAX3/PAX7-FKHR fusion gene has been reported in ARMS but not in ERMS and SRCT. The aim of this study was to explore its value in RMS diagnosis and differentiation. Ninety-eight patients with ARMS (n = 13), ERMS (n = 25), pleomorphic RMS (n = 5), Ewing sarcoma (n = 11), neuroblastoma (n = 18), lymphoma (n = 24), and uncertain SRCT (n = 2) were analyzed. One hundred fifteen RNA samples were extracted from the primary tumor tissue at initial presentation and relapse. One-step reverse transcriptase polymerase chain reaction assays for the PAX3/PAX7-FKHR fusion transcripts were performed. Molecular findings were compared with original histologic diagnoses. PAX3-FKHR fusion transcript was detected in 9 ARMS samples, PAX7-FKHR fusion transcript was detected in 7 ARMS samples, and 2 uncertain SRCTs were detected; none of them were detected in ERMS, Ewing sarcoma, neuroblastoma, and lymphoma. Direct sequencing of PAX3 coding regions revealed a heterozygous mutation A→G (nt1380) at codon 448 (AAT→GAT), resulting in substitution of Asn-448 for Asp. Detection of PAX3/PAX7-FKHR fusion transcripts by 1-step reverse transcriptase polymerase chain reaction is a novel tool for RMS diagnosis and differentiation.
authors.affiliation: Department of Pharmacology, China Medical University, Shenyang, People's Republic of China.
authors.forename: Xiu-Li
authors.initials: XL
authors.lastname: Yang
authors.forename: Shu-Cheng
authors.initials: SC
authors.lastname: Zhang
authors.forename: Shi-Wei
authors.initials: SW
authors.lastname: Zhang
authors.forename: Hao
authors.initials: H
authors.lastname: Wang
mesh_terms: D001483:Base Sequence; D014408:Biomarkers, Tumor / Q000032:analysis* / Q000235:genetics; D004252:DNA Mutational Analysis; D006801:Humans; D008969:Molecular Sequence Data; D015514:Oncogene Proteins, Fusion / Q000032:analysis*; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods*; D012208:Rhabdomyosarcoma / Q000145:classification / Q000175:diagnosis* / Q000235:genetics; D012983:Soft Tissue Neoplasms / Q000145:classification / Q000175:diagnosis* / Q000235:genetics
chemical_list: D014408:Biomarkers, Tumor; D015514:Oncogene Proteins, Fusion; C523321:PAX3-FKHR fusion protein, human; C561715:PAX7-FKHR fusion protein, human