A meta-analysis of two large GWAS studies focusing on obsessive-compulsive disorder (OCD) did not result in SNPs with genome-wide significance but it did have variants near PTPRD (p = 4.1 × 10–7) amongst the top signals (International Obsessive Compulsive Disorder Foundation Genetics Collaborative and OCD Collaborative Genetics Association Studies, 2018). This evidence concerns the gene PTPRD and obsessive-compulsive disorder.