BIRC5 and posterior cortical atrophy: In summary, this study augments our ongoing work on EV-contained Survivin [15, 16, 23] by showing that other members of the IAP family, in this case cIAP2 and XIAP, may also be involved in differentially modulating the prostate tumor microenvironment in a race-related context, potentially contributing to racial disparities in PCa mortality.