We report a nominal association between this TSPO polymorphism and the diagnosis of Bipolar Disorder in both the genome-wide dataset of the Wellcome Trust Case–Control Consortium and the Psychiatric Genome-Wide Association Study Consortium Bipolar Disorder group (OR = 1.11, p = 0.007; OR = 1.10, p = 0.011, respectively). Here, TSPO is linked to bipolar disorder.