CD81 and posterior cortical atrophy: Several previously reported PCa biomarkers, such as GPC1, CD44, PSA, and PSMA, were also detected in the PCa‐secreted sEVs.[13] EV markers from the Vesiclepedia database were investigated (Figure 3C boxes) to illustrate the accuracy of this sEV study and provide a detailed distribution of these proteins in the sEVs from PCa cell lines.[11, 14] For example, traditional tetraspanins such as CD9 and CD81 were found in sEVs from all 5 cell lines.