B-cell specific moloney leukemia virus insertion site 1(Bmi-1)gene is a core member of the polycomb group genes,considered to be a proto-oncogene;Bmi-1 plays an important role in cell self-renewal, proliferation and apoptosis. Several studies have shown that Bmi-1 is highly expressed in non-small cell lung cancer;furthermore,the expression level of Bmi-1 is closely related to the occurrence,development,incursion and prognosis of non-small cell lung cancer. Bmi-1 is expected to become a novel tumor molecular marker,and provides a new direction for the treatment of non-small cell lung cancer.