Werner and colleagues found in 2008 that nigral ferritin levels were increased (light and heavy chain ferritins, but statistically significant only for heavy chain ferritin (Werner et al. 2008), while Koziorowski reported in 2007 that nigral levels of light chain ferritin were lower and those of heavy chain ferritin higher in Parkinson disease (Koziorowski et al. 2007). Here, FTH1 is linked to Parkinson disease.