Effects of G207, a conditionally replication-competent oncolytic herpes simplex virus, on the developing mammalian brain

Andrew E. Radbill, Alyssa T. Reddy, James M. Markert, J. Michael Wyss, Martin M. Pike, N. Shastry Akella, Niteesh Bharara, G. Yancey Gillespie

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Viral oncolytic therapy for malignant brain tumors involves local intratumoral delivery of a genetically engineered virus with tumor cell-specific lytic activity. Promising preliminary results have been achieved in preclinical models with G207, a replication-competent herpes simplex virus type 1 constructed with multiple directed mutations. Although the safety of G207 has been demonstrated in adults, application of viral oncolytic therapy to children with brain tumors has been delayed because of previous lack of data concerning the impact of a replication-competent oncolytic virus on the developing mammalian brain. In this study there was no significant difference in long-term physical development, cognitive performance, or exploratory behaviors between mice that received intracerebral inoculation of G207 or control saline at 4 days of age. However, histological examination and magnetic resonance imaging revealed frequent unilateral ventriculomegaly ipsilateral to the site of injection in only the G207 group. These results suggest that although it is unlikely that G207 will have significant adverse effects on neurodevelopmental outcomes of pediatric patients with brain tumors, an initial study of G207 in children should exclude those patients with tumors in or near the ventricular system as well as patients less than 2 years of age. Furthermore, patients in such a study will need to be closely monitored for the development of hydrocephalus.

Original languageEnglish (US)
Pages (from-to)118-129
Number of pages12
JournalJournal of neurovirology
Issue number2
StatePublished - Mar 2007
Externally publishedYes


  • Animal model
  • Brain tumors
  • Growth
  • Human herpesvirus 1
  • Investigational therapies
  • Learning

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Virology


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