FOXP4 and posterior cortical atrophy: RT‐qPCR was used to analyse the levels of candidate lncRNAs, and four lncRNAs (NEAT1, ARLNC1, FOXP4‐AS1 and DSCAM‐AS1) were identified to be differently expressed in serum from 190 PCA patients, 140 benign controls, and 170 healthy controls.