Of these, ten can be classified as tumour antigen genes, including PAGE2B (prostate-associated P antigen family, member 2B, pGRAIL = 3.3x10-9), SAGE1 (sarcoma antigen 1, pGRAIL = 5.8x10-6), XAGE5 (X Antigen Family, Member 5, pGRAIL = 8.2x10-4), DUSP21 (Dual Specificity Phosphatase 21, cancer/testis antigen, pGRAIL = 4.5x10-3), CT55 (CXorf48, cancer/testis antigen 55, pGRAIL = 3.8x10-2) and five melanoma-associated antigens (MAGEA11, MAGED2, MAGED4, MAGED9 and MUM1L1) (S2 Table). Here, CT55 is linked to cancer.