ABCG1 promotes cell proliferation, migration, and invasion in lung cancer cells, and is associated with expression of anti-apoptotic proteins (B-cell lymphoma 2 (BCL2) or Myeloid-cell leukemia 1 (MCL1), stemness markers (CD133 and ALDH), and proliferative markers (such as c-Myc) (87). The gene discussed is MCL1; the disease is lung cancer.