MAGE-A274L9 was derived from MAGE-A3274, since MAGE-A3274 is shared by MAGE-A3, the most expressed in tumour cells (46% in lung, 57% in gastric cancer, 68% in hepatocarcinoma, 76% in RCC) and MAGE-A12 expressed in 74% of melanoma. The gene discussed is MAGEA12; the disease is gastric cancer.