Kazi et al. [31] employed a multimodal GCN for node-level AD stage classification using diverse biomarkers (MR, PET imaging, cognitive tests, cerebrospinal fluid (CSF) biomarkers, etc.)as node features and the apolipoprotein E (ApoE) genotype, FDG PET imaging, age, and gender for edge assignment. Here, APOE is linked to Alzheimer disease.