CYP1A2 and psychiatric disorder: In the liver tissue donors and patients with psychiatric disorders involved in the present study, the −3860G>A and −2467delT SNPs were identified with frequencies similar to other European populations [20,55]; however, these SNPs were in linkage disequilibrium with −163C>A in CYP1A2*1L, CYP1A2*1V and CYP1A2*1W.