News Column

New Cancer Gene Therapy Findings from Stanford University School of Medicine Discussed

June 16, 2014



By a News Reporter-Staff News Editor at Cancer Gene Therapy Week -- A new study on Biotechnology is now available. According to news originating from Stanford, California, by NewsRx correspondents, research stated, "Metastatic breast cancer is an obdurate cancer type that is not amenable to chemotherapy regimens currently used in clinic. There is a desperate need for alternative therapies to treat this resistant cancer type."

Our news journalists obtained a quote from the research from the Stanford University School of Medicine, "Gene-Directed Enzyme Prodrug Therapy (GDEPT) is a superior gene therapy method when compared to chemotherapy and radiotherapy procedures, proven to be effective against many types of cancer in pre-clinical evaluations and clinical trials. Gene therapy that utilizes a single enzyme/prodrug combination targeting a single cellular mechanism needs significant overexpression of delivered therapeutic gene in order to achieve therapy response. Hence, to overcome this obstacle we recently developed a dual therapeutic reporter gene fusion that uses two different prodrugs, targeting two distinct cellular mechanisms in order to achieve effective therapy with a limited expression of delivered transgenes. In addition, imaging therapeutic reporter genes offers additional information that indirectly correlates gene delivery, expression, and functional effectiveness as a theranostic approach. In the present study, we evaluate the therapeutic potential of HSV1-sr39TK-NTR fusion dual suicide gene therapy system that we recently developed, in MDA-MB-231 triple negative breast cancer lung-metastatic lesions in a mouse model. We compared the therapeutic potential of HSV1-sr39TK-NTR fusion with respective dual prodrugs GCV-CB1954 with HSV1-sr39TK/GCV and NTR/CB1954 single enzyme prodrug system in this highly resistant metastatic lesion of the lungs. In vitro optimization of dose and duration of exposure to GCV and CB1954 was performed in MDA-MB-231 cells. Drug combinations of 1 ?g/ml GCV and 10 ?M CB1954 for 3 days was found to be optimal regimen for induction of significant cell death, as assessed by FACS analysis. In vivo therapeutic evaluation in animal models showed a complete ablation of lung metastatic nodules of MDA-MB-231 triple negative breast cancer cells following two consecutive doses of a combination of GCV (40 mg/kg) and CB1954 (40 mg/kg) administered at 5 day intervals. In contrast, the respective treatment condition in animals expressing HSV1-sr39TK or NTR separately, showed minimal or no effect on tumor reduction as measured by bioluminescence (tumor mass) and [(18)F]-FHBG microPET (TK expression) imaging."

According to the news editors, the research concluded: "These highlight the strong therapeutic effect of the dual fusion prodrug therapy and its use in theranostic imaging of tumor monitoring in living animals by multimodality molecular imaging."

For more information on this research see: Noninvasive theranostic imaging of HSV1-sr39TK-NTR/GCV-CB1954 dual-prodrug therapy in metastatic lung lesions of MDA-MB-231 triple negative breast cancer in mice. Theranostics, 2014;4(5):460-74 (see also Biotechnology).

The news correspondents report that additional information may be obtained from T.V. Sekar, Molecular Imaging Program at Stanford, Bio-X Program, Stanford University School of Medicine, Stanford, California, United States. Additional authors for this research include K. Foygel, O. Ilovich and R. Paulmurugan.

Keywords for this news article include: Biotechnology, Drugs, Stanford, Genetics, Oncology, California, Chemotherapy, Radiotherapy, United States, Breast Cancer, Bioengineering, Women's Health, Cancer Gene Therapy, Enzymes and Coenzymes, North and Central America, Clinical Trials and Studies.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Cancer Gene Therapy Week


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