title: [A study of expression of p53, c-myc and PCNA in retinoblastoma].
abstract: OBJECTIVE
  To investigate the expressions of p53, c-myc (oncogene) and proliferating cell nuclear antigen (PCNA) in retinoblastoma (Rb) and the relationships of the expression to the degree of differentiation and optic nerve infiltration.
  
  
  METHODS
  The expressions of p53, c-myc and PCNA in Rb tissues of 31 cases were analyzed by using LSAB immunohistochemical method.
  
  
  RESULTS
  The positive rates of p53, c-myc and PCNA in Rb were respectively 51.6%, 45.2% and 67.7% and all the expressions were significantly related to the differentiation degree of Rb (all P < 0.05). The expression of PCNA was significantly related to the optic nerve infiltration of Rb (P < 0.05). Both the expressions of p53 and c-myc in Rb were markedly correlated with the expression of PCNA (all P < 0.05).
  
  
  CONCLUSIONS
  The occurrence of Rb is the result of multiple gene mutations. The determinations of p53, c-myc and PCNA are of significance for evaluating the histologic characteristics and biological behavior of Rb.
authors.affiliation: Department of Ophthalmology, Nanjing Children Hospital, Nanjing 210008.
authors.forename: X
authors.initials: X
authors.lastname: Yang
authors.forename: Z
authors.initials: Z
authors.lastname: Zhang
authors.forename: Q
authors.initials: Q
authors.lastname: Zeng
mesh_terms: D002675:Child, Preschool; D006801:Humans; D007223:Infant; D018809:Proliferating Cell Nuclear Antigen / Q000096:biosynthesis*; D016271:Proto-Oncogene Proteins c-myc / Q000096:biosynthesis*; D019572:Retinal Neoplasms / Q000378:metabolism* / Q000473:pathology; D012175:Retinoblastoma / Q000378:metabolism* / Q000473:pathology; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis*
chemical_list: D018809:Proliferating Cell Nuclear Antigen; D016271:Proto-Oncogene Proteins c-myc; D016159:Tumor Suppressor Protein p53