The present invention relates to anti-
cancer viruses that co-express complement regulatory proteins CD55 and CD59. Since the anti-
cancer virus of the present invention can maintain its
curative effect even when intravenously injected, the anti-
cancer virus can also be applied to the treatment of various
solid cancers and metastatic cancers in addition to superficial
solid cancers. Furthermore, the anti-cancer
virus of the present invention obtains resistance to attacks of an in-vivo
complement system by expressing complement regulatory
protein on the surface of the virus, thereby being stable in blood and maintaining stable anti-cancer activity during intravenous injection, thereby reducing the application amount of the virus to reduce the side effects of anti-
cancer drugs as much as possible. Therefore, the anti-cancer virus of the present invention can be used for preventing or treating cancer.