KLK3 and neoplasm: In practice, most developed mRNA vaccines encode one of the two types of tumor antigens, with common examples including carcinoembryonic antigen (CEA), prostate-specific antigen (PSA), melanoma-associated antigen (MAGE) 1, survivin, tyrosinase, human telomerase reverse transcriptase (hTERT), and Wilms’ tumor 1 antigen (WT1) [57,58].