string: Benzene, one of the most widely used industrial chemicals, is recognized as human carcinogen (Yin et al., 1996; Savitz and Andrews, 1997; Golding and Watson, 1999; Phibbs, 2001; Snyder, 2000; Huff, 2007), the carcinogenesis effect is attributed to the production of reactive oxygen species and DNA damage (Ishihama et al.