ETV6 rearrangements in patients with infantile fibrosarcomas and congenital mesoblastic nephromas by fluorescence in situ hybridization

Mod Pathol. 2001 Dec;14(12):1246-51. doi: 10.1038/modpathol.3880469.


Congenital mesoblastic nephroma (CMN) and infantile fibrosarcoma (IFS) are two pediatric tumors arising in the kidneys and soft tissues of infants, respectively. Recently, a t(12;15)(p13;q25) resulting in ETV6-NTRK3 gene fusion was detected in patients with IFS and in patients with the cellular type of CMN, suggesting a common pathogenetic pathway. We investigated the presence or absence of ETV6 rearrangements and numerical abnormalities of chromosome 11 by using fluorescence in situ hybridization on paraffin-embedded material from five cases of IFS, two of CMN, and one of mixed type (CMN and IFS) found in our files. In three cases of IFS, we found ETV6 gene rearrangement but a normal copy number of chromosome 11. One case each of IFS, the cellular type of CMN, and the mixed type (CMN and IFS) had both abnormalities. In a case of classic CMN, neither trisomy 11 nor gene rearrangement was found. It is possible that trisomy 11 is a later, nonessential event in the pathogenetic process or that this secondary aberration is associated with still-unrecognized clinical or biological characteristics. We confirmed that IFS and the cellular type of CMN are cytogenetically related and can occur synchronously in the same organ.

MeSH terms

  • Child, Preschool
  • Chromosome Banding
  • Chromosomes, Human, Pair 11
  • DNA-Binding Proteins / genetics*
  • Female
  • Fibrosarcoma / genetics*
  • Fibrosarcoma / pathology
  • Gene Dosage
  • Gene Rearrangement*
  • Humans
  • In Situ Hybridization, Fluorescence
  • Infant
  • Kidney Neoplasms / congenital
  • Kidney Neoplasms / genetics*
  • Kidney Neoplasms / pathology
  • Male
  • Nephroma, Mesoblastic / congenital
  • Nephroma, Mesoblastic / genetics*
  • Nephroma, Mesoblastic / pathology
  • Proto-Oncogene Proteins c-ets
  • Repressor Proteins / genetics*
  • Soft Tissue Neoplasms / genetics*
  • Soft Tissue Neoplasms / pathology
  • Translocation, Genetic
  • Trisomy


  • DNA-Binding Proteins
  • ETS translocation variant 6 protein
  • Proto-Oncogene Proteins c-ets
  • Repressor Proteins