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Updated: Jan 31, 2026

Growth, Purification, and Titration of Oncolytic Herpes Simplex Virus
06:14

Growth, Purification, and Titration of Oncolytic Herpes Simplex Virus

Published on: May 13, 2021

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Therapeutic Effect on Bladder Cancer with a Conditionally Replicating Oncolytic Virus Derived from Type II Herpes

Kwan Joong Joo1,2, Hongtao Li3,4,5, Xiaoliu Zhang3,4,6,7

  • 1Scott Department of Urology, Baylor College of Medicine, Houston, TX, USA.

Bladder Cancer (Amsterdam, Netherlands)
|December 19, 2018
PubMed
Abstract

Insights

A novel oncolytic virus from herpes simplex virus type II (HSV-2), FusOn-H2, demonstrated potent anti-tumor activity against bladder cancer in mice. This virotherapy also induced significant anti-tumor immunity, offering a promising new treatment strategy.

Area of Science:

  • Oncolytic virotherapy
  • Cancer immunology
  • Herpes simplex virus vectors

Background:

  • Bladder cancer remains challenging due to resistance to conventional therapies.
  • Oncolytic viruses offer a targeted approach to cancer treatment.
  • Herpes simplex virus (HSV) is a promising platform for oncolytic virus development.

Purpose of the Study:

  • To evaluate the antitumor efficacy of a novel HSV-2-derived oncolytic virus (FusOn-H2) against bladder cancer.
  • To compare FusOn-H2 with an existing HSV-1-derived oncolytic virus (Baco-1).
  • To assess the immunogenicity of FusOn-H2 in a preclinical bladder cancer model.

Main Methods:

  • An orthotopic bladder cancer model was established in C3H/He mice using MBT-2 cells.
  • Oncolytic viruses (Baco-1 or FusOn-H2) were administered via intravesical instillation.
  • Tumor volume, weight, and spleen immune cell activity were analyzed post-treatment.

Main Results:

  • Intravesical instillation of FusOn-H2 and Baco-1 led to near-complete tumor eradication in most treated mice.
  • FusOn-H2 induced potent tumor-specific cytotoxic T lymphocyte responses.
  • Oncolytic virotherapy, particularly with FusOn-H2, effectively stimulated anti-tumor immunity.

Conclusions:

  • Oncolytic HSV-2 demonstrates significant potential as a treatment for bladder cancer.
  • The induced tumor-specific cellular immunity enhances the overall therapeutic effect.
  • FusOn-H2 represents a promising intravesical virotherapy strategy for bladder cancer patients.
Keywords:
Urinary bladder neoplasmsherpes simplex virusoncolytic virusras gene

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