Exosomal proteins, especially tumor‐specific antigens, are comparable to the mother cells from which they are secreted.[58] Key examples are the anchored membrane glycoprotein mesothelin critical for tumor development and drug resistance, and carcinoembryonic antigens available in tumor‐derived exosomes.[59] Consequently, scientists are concentrating on exploring tumor‐released exosomes for cancer vaccine development. This evidence concerns the gene MSLN and neoplasm.