The GSTM1 null and GSTT1 null appear to be associated with a significant risk of several types of cancers, such as hematological neoplasm (Banescu et al., 2014; Sailaja et al., 2010; Zhou et al., 2013) and breast cancer (Hashemi et al., 2012). The gene discussed is GSTM1; the disease is hematopoietic and lymphoid system neoplasm.