Kharaziha et al. [110] identified MDR-1, MDR-3, endophilin-A2, and poly(A) binding protein 4 as enriched proteins in EVs from both prostate cancer cells resistant to docetaxel and castration-resistant prostate cancer patient serum, suggesting potential as biomarkers for therapeutic response or resistance [110]. Here, ABCB4 is linked to prostate cancer.