title: Xp11.2 Translocation renal cell carcinomas have a poorer prognosis than non-Xp11.2 translocation carcinomas in children and young adults: a meta-analysis.
abstract: OBJECTIVE
  Renal cell carcinomas (RCCs) in children and adolescents are much rarer than in adults. In this age group, Xp11.2 translocation RCCs were the most common subtype of pediatric RCCs. Information regarding the clinical behavior of pediatric RCCs remains controversial because of their relatively rare incidence. The authors aimed to perform a systematic review and meta-analysis to better define the biological features of pediatric RCCs.
  
  
  METHODS
  Eligible studies were identified through multiple search strategies. Studies were assessed for quality using the Jadad Quality Scale. Data were collected comparing overall survival (OS), disease-free survival (DFS), and stage in patients with TFE3 + pediatric RCCs and TFE3 - RCCs.
  
  
  RESULTS
  A total of 4 studies were included for meta-analysis, and pooled odds ratios (ORs) with 95% confidence interval (CI) were calculated. The meta-analysis outcomes showed that TFE3 + pediatric RCCs were significantly associated with poorer outcomes (OS and DFS) and a higher stage (III/IV) than TFE3 - RCCs (pooled ORs for each group: 4.59 [95% CI = 1.46-14.42] for OS; 5.79 [95% CI = 1.85-18.16] for DFS; and 5.89 [95% CI = 2.23-15.52] for stage). This result was also confirmed by OS and DFS curves (P = .005 and P = .001).
  
  
  CONCLUSIONS
  Xp11.2 translocation carcinomas appear to have a poorer prognosis than non-Xp11.2 translocation carcinomas in children and young adults.
authors.affiliation: Department of Pathology, Clinical School of Medical College of Nanjing University/Nanjing Jinling Hospital, Nanjing, Jiangsu 210002, China.
authors.lastname: Qiu Rao
authors.lastname: Bing Guan
authors.forename: Xiao-jun
authors.initials: XJ
authors.lastname: Zhou
mesh_terms: D000328:Adult; D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors / Q000235:genetics; D002292:Carcinoma, Renal Cell / Q000235:genetics* / Q000401:mortality*; D002648:Child; D002675:Child, Preschool; D041321:Chromosomes, Human, X; D018572:Disease-Free Survival; D006801:Humans; D007223:Infant; D053208:Kaplan-Meier Estimate; D007680:Kidney Neoplasms / Q000235:genetics* / Q000401:mortality*; D011379:Prognosis; D014178:Translocation, Genetic; D055815:Young Adult
chemical_list: D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors; C069203:TFE3 protein, human