In collaboration with Weinberger's group, and in the context of the Cambridgeshire Parkinson's Incidence from GP to Neurologist (CamPaIGN) cohort study which we elaborate on later, 288 PD patients stratified by COMT polymorphism were assessed, focusing in particular on the CANTAB SoC test [50]. This evidence concerns the gene COMT and Parkinson disease.