Oncolytic viruses have demonstrated selective replication and killing of tumor cells. Different types of oncolytic viruses including adenoviruses, herpes simplex viruses, Newcastle disease viruses, reovirus, coxsackie viruses, vaccinia viruses, etc., have been applied as either naturally occurring or engineered vectors. https://www.creative-biolabs.com/oncolytic-virus/oncolytic-virus-basis.htm