TSPO and Parkinson disease: An in vivo positron emission tomography (PET) imaging study detected an increased binding of (R)-[11C]PK11195, a prototypical translocator protein 18 kDa (TSPO) radiotracer, to the TSPO in GBA carriers without PD compared to age-matched healthy controls (HC), suggesting that this change could be an early event in GBA-PD [12].