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Abstract
Background: Herpes simplex virus 1716 (HSV1716), a selectively replication competent mutant of HSV1, is under investigation as an oncolytic viral therapy in human malignant glioma. As with similar therapies, a technique for measurement of viral replication and distribution over time following virus administration is required. Imaging expression of the HSV-thymidine kinase (HSV-tk) gene offers an opportunity for non-invasive assessment of viral distribution in living subjects. This is the first study to explore the use of HSV-tk as a reporter gene and radiolabelled thymidine analogue 5[(123)I]iodo-1(2-deoxy-2-fluoro-beta-D-arabinofuranosyl) uracil ((123)I-FIAU) as a marker substrate to non-invasively monitor HSV1716 replication in humans during treatment of high-grade glioma.
Methods: I-FIAU brain S…