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Prostate cancer(PCa) is a common malignancy in males. Exosomes are lipid bilayer vesicles containing protein, mRNA and miRNA, which are active in intercellular communications. Exosomes promotes the development of prostate cancer, support immune evading and chemotherapy resistance, stimulate angiogenesis, induce epithelial-mesenchymal transition(EMT) of tumor cells, and contribute to the formation of pre-metastasis niche, thus promoting the invasion and metastasis of prostate cancer. Based on the role in tumor biological behavior and heterogeneity in different cells, exosomes hold great potentials as biomarker for diagnosis and prognosis of prostate cancer, and are expected to become a favorable drug carrier. It has a promising prospect for cancer therapy.