FLI-1 was initially found in mouse erythroleukaemia [5], and many studies have shown that FLI-1 is expressed not only in haematological tumours but also in Ewing’s sarcoma, breast cancer, lung cancer, bladder cancer, melanoma, lymphoma, astrocytoma, ovarian cancer, cervical cancer, colorectal cancer, nasopharyngeal carcinoma and other solid tumours [6, 72–79]. This evidence concerns the gene FLI1 and lung cancer.