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Updated: Jul 17, 2026

Reconstruct Human Retinoblastoma In Vitro
06:52

Reconstruct Human Retinoblastoma In Vitro

Published on: October 11, 2022

Human retinoblastoma is not caused by known pRb-inactivating human DNA tumor viruses

Maura L Gillison1, Renwei Chen, Eleni Goshu

  • 1Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD 21231, USA. gillima@jhmi.edu

International Journal of Cancer
|January 6, 2007
PubMed

Insights

This study found no evidence that human papillomavirus (HPV) or other DNA tumor viruses cause retinoblastoma, a cancer linked to the RB1 gene. Viral DNA detection in tumors was negative, refuting a viral role in retinoblastoma development.

Area of Science:

  • Oncology
  • Virology
  • Genetics

Background:

  • Retinoblastoma is caused by inactivation of the tumor suppressor retinoblastoma protein (pRb).
  • Recent studies suggested human papillomavirus (HPV) DNA in retinoblastomas, prompting investigation into viral roles.
  • The RB1 gene locus is classically inactivated in retinoblastoma development.

Purpose of the Study:

  • To investigate the role of pRb-inactivating DNA tumor viruses, including HPV, in human retinoblastoma pathogenesis.
  • To analyze viral genomic DNA presence and RB1 gene alterations in retinoblastoma tumors.
  • To determine if viral oncoproteins contribute to retinoblastoma development.

Main Methods:

  • Real-time polymerase chain reaction (PCR) was used to detect genomic DNA of HPV, adenovirus (HAdV), and polyomaviruses (BKV, JCV, SV40).
  • RB1 gene locus and promoter were screened for genetic and epigenetic alterations using exonic copy number detection, sequencing, and methylation-specific PCR.
  • 40 fresh-frozen retinoblastoma tumors from various patient groups were analyzed.

Main Results:

  • No HPV, HAdV, BKV, or JCV genomic sequences were detected in any tumor samples.
  • SV40 genomic DNA was detected at very low copy numbers, consistent with plasmid-derived artifact, not viral infection.
  • RB1 gene locus inactivating modifications were identified in most tumors, but no viral DNA correlated with these alterations.

Conclusions:

  • This study provides substantial quantitative evidence against a role for HPV or other pRb-inactivating DNA tumor viruses in retinoblastoma development.
  • The findings contradict recent reports suggesting a viral etiology for retinoblastoma.
  • Retinoblastoma development appears independent of viral infection, regardless of RB1 gene status.

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