Furthermore from Additional file 2 it is evident that in the subgroup of early untreated patients median prolactin levels did not differ between the various patient groups [PSP/CBS (n = 10; 3.3 ng/ml; range 1.1-5.8), MSA (n = 11; median 2.9 ng/ml; 0.2-19.3), PD (n = 37; median 3.6 ng/ml; 0.2-21.5) and controls (n = 99; median 3.7 ng/ml; 0.5-37.5)]. The gene discussed is PRL; the disease is Parkinson disease.