TCE and its metabolites TCA and DCA have been reported to decrease the methylation of promoter regions of the c-myc gene, leading toan increased mRNA expression in the liver of B6C3F1 mice. In the present study there was no significant change in the mRNA expression level of c-myc and p16 genes in the TCE-exposed group. It would be difficult to conclude that TCE and/or its metabolites cause modulation in expression of c-myc and p16 genes in human lymphocytes.