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Ganciclovir is a drug that is FDA approved to treat cytomegalovirus (CMV). There is some evidence (and also some evidence against - see this article: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9353163/) that CMV may either cause glioblastomas or contribute to the growth of these tumors. If true, it would make sense that an anti-CMV drug would help. Early results of a vaccine against CMV showed promising results. We need more research on this topic because this drug (and similar drugs) are readily available, relatively cheap and easy to use.