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Oncolytic viral therapy for human pancreatic cancer cells by reovirus

Tsuyoshi Etoh1, Yoshihisa Himeno, Toshifumi Matsumoto

  • 1Department of Surgery I, Faculty of Medicine, Oita Medical University, Hasamamachi 1-1, Oita 879-5593, Japan. teto@oita-med.ac.jp

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|March 13, 2003
PubMed
Abstract

Insights

Reovirus shows promise as a novel pancreatic cancer therapy. It effectively targets cancer cells with Ras pathway activation, suppressing tumor growth and demonstrating systemic effects in preclinical models.

Area of Science:

  • Oncology
  • Virology
  • Molecular Biology

Background:

  • Pancreatic cancer exhibits a poor prognosis with limited therapeutic options.
  • Reovirus demonstrates oncolytic effects in cancers with activated Ras signaling.
  • Frequent K-ras mutations in pancreatic cancer suggest potential susceptibility to reovirus.

Purpose of the Study:

  • To investigate the feasibility of reovirus (serotype 3) as an anti-pancreatic cancer agent.
  • To evaluate reovirus's efficacy against human pancreatic cancer cell lines and in preclinical models.

Main Methods:

  • In vitro infection of five human pancreatic cancer cell lines with reovirus.
  • Assessment of Ras activity in cancer cell lines and correlation with reovirus susceptibility.
  • Evaluation of reovirus efficacy in unilateral and bilateral murine xenograft models.
  • Immunohistochemical analysis of reovirus replication in tumor tissues.

Main Results:

  • Reovirus successfully infected all tested human pancreatic cancer cell lines.
  • Elevated Ras activity was confirmed in cancer cell lines, correlating with reovirus susceptibility.
  • Intratumoral reovirus injection suppressed tumor growth in xenograft models.
  • Systemic antitumor effects were observed following local reovirus administration.
  • Reovirus replicated within tumors but not in surrounding normal tissues.

Conclusions:

  • Reovirus demonstrates significant oncolytic potential against pancreatic cancer.
  • Reovirus warrants consideration as a novel therapeutic strategy for pancreatic cancer.
  • The Ras signaling pathway is a key determinant of reovirus efficacy in pancreatic cancer.

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