18 . Guo ZS , Thome SH , Bartlett DL . Oncolytic virotherapy : molecular targets in tumor - selective replication and carrier cell - mediated delivery of oncolytic viruses . Biochim Biophys Acta 2008 ; 1785 ( 2 ) : 217 - 31 doi 10 . 1016 / j . bbcan , 2008 . 02 . 001 .