The restriction profile of the GSTP1: c.313A > G (Alw26I, BsmAI A>G). DNA Ladder (50–1500bp, Bio Basic Inc., Canada); lane 1: undigested PCR product; lane 2: AG genotype (heterozygous); lane 3: AA genotype (homozygous, wild type); and lane 4: GG genotype (homozygous, polymorphic) (the 93-and 83-bp fragments could not be separated from each other on the gel)