Abstract
Early phase human clinical trials using several versions of oncolytic herpes simplex virus type 1 (oHSV) have shown promise in the treatment of GBM, but efficacy has been limited. Impediments to oHSV therapy include poor virus spread due in part to the tumor extracellular matrix, and insufficient replication in tumor cells as a result of attenuating mutations. Thus, the central goal of this project is to improve oncolytic vector delivery, replication and spread while maintaining safety and tumor specificity. We have already developed a new class of two stage tumor targeted oHSV combining (i) selective infection through tumor-specific receptors and (ii) selective replication based on differential expression of microRNAs (miRs) in tumor and normal cells. We further modify our vector by arming with the matrix metalloproteinase 9 (MMP9) as a means to reduce vector trapping in the tumor extracellular matrix. Data will be presented on the effect the effect of oHSV on the tumor microenvironment.
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