PROX1 and Alzheimer disease: Variable importance analyses reveal that combining the expression of the 18 selected lncRNAs with demographic variables, such as gender, age, and educational level, enhances the predictive power for AD diagnosis; two lncRNAs (ENST00000608936 harbored in PROX1-AS1 and ENST00000582092 harbored in SS18) are the most important predictors (Figure 5).