SNCA and Lewy body dementia: Nevertheless, the GCase protein was identified in 32–90% of Lewy bodies in patients with GBA1-related PD or Dementia with Lewy bodies (DLB) and less than 10% of Lewy bodies in patients with idiopathic PD, suggesting a possible interaction between GCase and α-synuclein [12,17,256,269,300].