LRRK2 and Parkinson disease: In our study, we found a weak correlation between salivary DJ-1 levels with putamen uptake of 99mTc-TRODAT-1 in 74 PD patients, which was inconsistent with the previous study, in which there was no correlation between CSF DJ-1 and PET measures of striatal DA function in total of 26 LRRK2 mutation carriers (Shi et al., 2012).