Although exosomal APOE were reported as potential biomarkers in several studies, we still need to be very cautious to verify if its exosome resource, as the molecular size of low-density lipoproteins is very close to exosomes, and APOE is also a high accumulative plasma protein [26].Two exosomal-protein LRG1 and ITH3 and their combination showed a good potential as liquid biopsy markers to distinguish CRPC from PCa. The gene discussed is APOE; the disease is posterior cortical atrophy.