PIK3C2G and schizophrenia: In summary, through the GWAS approach combined with GM volume as QTs, we identified some novel susceptibility loci for schizophrenia on 3 genes/intergenic regions, namely TBXAS1, PIK3C2G and HS3ST5, as potential risk factors for schizophrenia in first-episode treatment-naïve patients with schizophrenia and controls.