A live-attenuated strain of the Gram-positive bacterium Listeria monocytogenes (Lm) with potential immunostimulatory and antineoplastic activities. Upon intravenous administration, attenuated Listeria monocytogenes CRS-100 may accumulate in and infect liver cells where it may activate a potent innate immune response and an adaptive immune response involving the by recruitment and activation of T lymphocytes. This agent may potentiate the immune response to vaccines against various liver neoplasms. Check foractive clinical trials using this agent.