Finally, CSF concentrations of protein tyrosine phosphatase receptor type Q (PTPRQ) in patients with iNPH were significantly higher than those of healthy individuals and those with Parkinson’s disease (PD) but did not differ significantly when compared to AD patients according to one study [80], while according to another study PTPRQ concentration in the CSF was significantly higher in patients with iNPH compared with those with AD [81]. This evidence concerns the gene PTPRQ and Alzheimer disease.