Cancer/Testis Antigen Family 45, Member A4, or, CT45A4, is a human gene. Other names include: Cancer/testis antigen family 45 member A4; Cancer/testis antigen 45-4; Cancer/testis antigen 45A4; cancer/testis antigen CT45-4; CT45-4; CT45.4. The encoded protein has an amino acid length of 189 and a mass of 21.2 kDa. Cancer/Testis Antigen Family 45, Member A4 is a member of the CT45 family.