Oncolytic virotherapy for ovarian carcinomatosis using a replication-selective vaccinia virus armed with a yeast cytosine deaminase gene

Cancer Gene Ther. 2008 Feb;15(2):115-25. doi: 10.1038/sj.cgt.7701110. Epub 2007 Dec 14.


In this study, we assessed the ability of a highly tumor-selective oncolytic vaccinia virus armed with a yeast cytosine deaminase gene to infect and lyse human and murine ovarian tumors both in vitro and in vivo. The virus vvDD-CD could infect, replicate in and effectively lyse both human and mouse ovarian cancer cells in vitro. In two different treatment schedules involving either murine MOSEC or human A2780 ovarian carcinomatosis models, regional delivery of vvDD-CD selectively targeted tumor cells and ovarian tissue, effectively delaying the development of either tumor or ascites and leading to significant survival advantages. Oncolytic virotherapy using vvDD-CD in combination with the prodrug 5-fluorocytosine conferred an additional long-term survival advantage upon tumor-bearing immunocompetent mice. These findings demonstrate that a tumor-selective oncolytic vaccinia combined with gene-directed enzyme prodrug therapy is a highly effective strategy for treating advanced ovarian cancers in both syngeneic mouse and human xenograft models. Given the biological safety, tumor selectivity and oncolytic potency of this armed oncolytic virus, this dual therapy merits further investigation as a promising new treatment for metastatic ovarian cancer.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, N.I.H., Intramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antimetabolites / administration & dosage
  • Antimetabolites / therapeutic use
  • Carcinoma / drug therapy
  • Carcinoma / therapy*
  • Cell Line, Tumor
  • Combined Modality Therapy
  • Cytosine Deaminase / administration & dosage
  • Cytosine Deaminase / genetics*
  • Cytosine Deaminase / therapeutic use
  • Female
  • Flucytosine / administration & dosage
  • Flucytosine / therapeutic use
  • Humans
  • Mice
  • Mice, Inbred C57BL
  • Mice, Nude
  • Oncolytic Virotherapy*
  • Ovarian Neoplasms / drug therapy
  • Ovarian Neoplasms / therapy*
  • Saccharomyces cerevisiae / enzymology
  • Saccharomyces cerevisiae / genetics*
  • Vaccinia virus / genetics*
  • Vaccinia virus / physiology
  • Virus Replication* / genetics


  • Antimetabolites
  • Flucytosine
  • Cytosine Deaminase