TNF and schizophrenia: Since most of the previous studies have analyzed the TNFA −308G/A polymorphism association with schizophrenia, we choose in the present case-control study to investigate the impact of LTA +252A/G (rs909253), TNFA −857C/T (rs1799724), and TNFA −238G/A (rs361525) polymorphisms on the susceptibility to schizophrenia.