CD8A and posterior cortical atrophy: The experimental groups included control group (untreated PC-3 cells), PCa-exos group (PC-3 cells plus PCa-exos), CD8+ T cell group (PC-3 cells plus CD8+ T cells), and CD8+ T cells treated with the PC-3-exos group (PC-3 cells plus CD8+ T cells pre-treated with PCa-exos).