We then analyzed a subset of samples with a very short PMI (≤ 6 h); under this condition, PMI was not significantly correlated with the levels of KLC1 in either AD (r = − 0.2060; P = 0.7139) or AD-DS (r = − 0.5786; P = 0.0622) samples. This evidence concerns the gene KLC1 and Alzheimer disease.