“…Then Coley tried to treat tumors with inactivated bacteria, such as S. pyogenes and Serrati amarcescens and established the foundation of bacterial therapies on cancer (Richardson et al, 1999). In recent years, people find various bacteria with good tumor-targeting property, including Salmonella (Pawelek et al, 1997), Escherichia, Clostridium (Malmgren and Flanigan, 1955;Minton, 2003), Bifidobacterium (Kohwi et al, 1978), Caulobacter, Listeria (Pan et al, 1999;Kim et al, 2009), Proteus (Arakawa et al, 1968), and Streptococcus (Maletzki et al, 2008). Caulobacter crescentus (C. crescentus) as a Gram-negative non-pathogenic bacterium presented tumor suppressive effects in unmodified form (Bhatnagar et al, 2006).…”