Expression of SSX-2 and SSX-4 genes in neuroblastoma

Int J Biol Markers. Oct-Dec 2002;17(4):219-23. doi: 10.5301/jbm.2008.1856.

Abstract

The SSX genes are members of the family of cancer/testis antigens that encode tumor-associated antigens recognizable by autologous cytolytic T lymphocytes. Their expression is common in tumors of diverse lineages and absent in normal tissues except testis and thyroid. In this study, sixty-seven neuroblastomas (NB) (12 stage 1, 13 stage 2, 12 stage 3, 12 stage 4S and 13 stage 4) were examined by RT-PCR and a sensitive chemiluminescent detection method for SSX-2 and SSX-4 expression. Seventy-two percent (13/18) of stage 4 NB expressed SSX-2 and 67% (12/18) expressed SSX-4. SSX-2 and SSX-4 positivity correlated with metastatic NB stage 4 (p=0.02 and p=0.006, respectively). Sensitivity experiments showed SSX-2 detection was one tumor cell in 10(6) normal cells, and one in 10(4) for SSX-4. All normal tissues (n=6), with the exception of testis, normal bone marrow (BM, n=12) and normal peripheral blood (PBL, n=10) were negative for SSX-2 and SSX-4 expression. Thirty-two BM and 14 PBL obtained from 35 stage 4 NB patients at 24 months from their diagnosis were evaluated for SSX-2 expression. Unlike another cancer/testis antigen, GAGE, only one BM sample was positive, and no prognostic utility could be established. Further investigation of SSX expression at other relevant time points is warranted.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Antigens, Neoplasm / genetics*
  • Biomarkers, Tumor / genetics*
  • Bone Marrow / metabolism
  • Gene Expression
  • Humans
  • Neoplasm Proteins / genetics*
  • Neoplasm Staging
  • Neuroblastoma / metabolism*
  • Neuroblastoma / pathology
  • Repressor Proteins / genetics*
  • Reverse Transcriptase Polymerase Chain Reaction
  • Sensitivity and Specificity

Substances

  • Antigens, Neoplasm
  • Biomarkers, Tumor
  • Neoplasm Proteins
  • Repressor Proteins
  • synovial sarcoma X breakpoint proteins