XAGE5 is a symbol for the gene, X antigen family member 5, in humans. Other names include: CT12.5; G antigen family D member 5; XAGE-5; Cancer/testis antigen 12.5; cancer/testis antigen family 12, member 5; GAGED5; X antigen family, member 5. The encoded protein has an amino acid length of 108 and a mass of 12.1 kDa. Other isoforms may exist. XAGE5 is a member of the GAGE family.