A cross-disorder genome-wide association study compared 46,008 individuals with psychiatric disorders—attention-deficit/hyperactivity disorder, affective disorder, anorexia, ASD, bipolar disorder, or schizophrenia—to population controls, yielding the discovery that the IGSF11 locus could be associated with multiple psychiatric disorders [41]. This evidence concerns the gene IGSF11 and attention deficit-hyperactivity disorder.