Enhanced therapeutic effect of HSV-tk+GCV gene therapy and ionizing radiation for prostate cancer

Molecular Therapy : the Journal of the American Society of Gene Therapy
M ChhikaraE Aguilar-Cordova

Abstract

Standard therapies for prostate cancer including radiation, prostatectomy, and hormone ablation have significant toxicities and recurrence risk. HSV-tk gene therapy may be effective in combination with radiation therapy due to complementary mechanisms and distinct toxicity profiles. Mouse prostate tumors transplanted subcutaneously were treated by either gene therapy involving intratumoral injection of AdV-tk followed by systemic ganciclovir or local radiation therapy or the combination of gene and radiation therapy. Both single-therapy modalities showed a 38% decrease in tumor growth compared to controls. The combined treatment resulted in a decrease of 61%. In addition the combined-therapy group had a mean survival of 22 days versus 16.6 days for single therapy and 13.8 days for nontreated controls. To analyze systemic anti-tumor activity, lung metastases were generated by tail vein injection of RM-1 prostate cancer cells on the same day that they were injected subcutaneously. The primary tumors were treated as before with AdV-tk followed by ganciclovir, radiation, or the combination. The number of lung nodules was reduced by 37% following treatment with AdV-tk, whereas radiotherapy alone had no effect on metastatic growth. T...Continue Reading

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Citations

Jan 12, 2005·Journal of Huazhong University of Science and Technology. Medical Sciences = Hua Zhong Ke Ji Da Xue Xue Bao. Yi Xue Ying De Wen Ban = Huazhong Keji Daxue Xuebao. Yixue Yingdewen Ban·Ali ZhangDing Ma
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