Numerous studies have also reported the possible association of deletions in GSTM1 and GSTT1 with the risk of developing other cancer types, including colorectal cancer in Caucasians (Economopoulos and Sergentanis, 2010), lung cancer in African-Americans, Japanese, Swedes, and South Indians (Ford et al., 2000; Sunaga et al., 2002; Alexandrie et al., 2004; Leelakumari et al., 2005), acute lymphoblastic leukemia in Thai (Pakakasama et al., 2005), and myeloid leukemia in non-Hispanic Caucasians (Davies et al., 2000). Here, GSTM1 is linked to acute lymphoblastic leukemia.