Expression of the 13 CT antigens (NY-SAR-35, SCP-1, SSX-1, SSX-2, SSX-4, MAGE-1, MAGE-3, MAGE-4, MAGE-10, CT-7, NY-TLU-57, NY-ESO-1 and LAGE-1) was assessed by RT-PCR in 79 lung cancer tissue samples. Here, MAGEA4 is linked to lung cancer.