“…Previous studies reported that the multidrug resistance 1 gene (MDR1) is an important candidate gene influencing HCC (Wu et al, 2007;Vander Borght et al, 2008;Chaijaroenkul et al, 2011;Chen et al, 2009Chen et al, , 2011Geng et al, 2011;Yu et al, 2011;Ren et al, 2012;Sun et al, 2012;Gao, 2013;Li et al, 2013;Yang et al, 2013). MDR1 is a polygenetic gene and many genetic polymorphisms, such as G159T, T335C, C1236T, C1465T, G2677A/T, C3435T, A3073C, and A4125C, have been reported to have possible associations with the risk of HCC (Cavaco et al, 2003;Pechandova et al, 2006;Wu et al, 2007;Vander Borght et al, 2008;Chen et al, 2009Chen et al, , 2011Yu et al, 2011;Ren et al, 2012;Gao, 2013;Yang et al, 2013). Several studies suggested that MDR1 genetic polymorphisms influenced HCC risk (Wu et al, 2007;Chen et al, 2009Chen et al, , 2011Ren et al, 2012;Gao, 2013;Yang et al, 2013).…”