sentence: In a syngeneic immunocompetent mouse model using B16ova melanoma , it was demonstrated that intratumoral administration of oncolytic vesicular stomatitis virus ( oVSV ) leads to increased CD8 T cell infiltration and resulted in 50 % survival within 30 days , compared to treatment with heat-inactivated oVSV or mice left untreated whose median survival was approximately 20 days .