“…Occupational epidemiological studies of workers at petrochemical and refinery plants indicate that exposure to benzene has a dose-response relationship with the risk for acute non-lymphocytic/acute myelogenous leukemia (Bloemen et al, 2004;Gun et al, 2006;Kirkeleit et al, 2008), exposure to vinyl chloride is associated with a substantial excess of angiosarcoma of the liver (Mundt et al, 2000;Ward et al, 2001), and exposure to butadiene is associated with an increased risk of non-Hodgkin lymphoma (Divine and Hartman, 2001). Two case-control studies from Taiwan indicated that living close to petrochemical industries may increase the risk of leukemia, especially in young people (Yu et al, 2006;Weng et al, 2008). However, a non-significant increase in the odds ratio for leukemia was obtained in the US (Tsai et al, 2004), Italy (Belli et al, 2004), and the UK (Sans et al, 1995).…”