KLK6, KLK8 and KLK10 were normally distributed in AD (p-values: pKLK6 = 0.156, pKLK8 = 0.200, pKLK10 = 0.200) and in NC (p-values: pKLK6 = 0.200, pKLK8 = 0.051, pKLK10 = 0.200). Here, KLK8 is linked to Alzheimer disease.