One patient with homozygous PINK1 mutation was reported together with parkin mutations in a German-Canadian study mentioned above.41 Apart from this publication, we identified only one article showing the DBS outcome of a homozygous PINK1 mutation carrier, highlighting successful treatment with GPi-DBS in a patient with prominent dystonia and dyskinesias.16 The gene discussed is PINK1; the disease is drug-induced dyskinesia.