ANTITUMOR AGENT

PURPOSE:An antitumor agent, containing a live vaccine of a virus belonging to the genus Paramyxovirus as an active constituent, and capable of exhibiting the antitumor effect on mammals. CONSTITUTION:An antitumor agent containing a live vaccine of a virus belonging to the genus Paramyxovirus, e.g. parainfluenza 1, 2 or 3 or mumps virus, as a principal constituent. The mumps virus is particularly preferred. The live vaccine of the virus is obtained by the subculture and attenuation of the virus in a grown hen's egg, yalk sac or amniotic cavity, and the attenuated viral live vaccine is if desired subjected to the purification, germ-free filtration, etc. and in general orally, preferably parenterally, administered. In experiments on ddy mice, BDF1 mice, etc., the viral live vaccine is observed to have the antitumor effect on the Ehrlich's cancer and leukemia L1210 cancer.