In addition, the consistency of these findings with experimental observations of GSTT1 (glutathione S-transferase theta 1), GSTZ1 (glutathione S-transferase zeta 1), and CYP2E1 (cytochrome P450, family 2, subfamily E, polypeptide 1) enzymatic activity strengthens the hypothesis that DBPs cause bladder cancer and suggests possible mechanisms, as well as the classes of compounds likely to be implicated (Cantor et al. 2010). Here, GSTZ1 is linked to urinary bladder carcinoma.