FOXD1 and Gal-3 form a positive regulatory loop to promote lung cancer cell growth and motility. CL1-5 cells were transfected with scramble, si-FOXD1, or si-Gal-3 or si-FOXD1 with si-Gal-3 for 72 h. Cells lysates were collected and analyzed by immunoblotting. (A) The proliferation ability was analyzed by CCK-8. (B) Representative images of the colony-forming assay. (C) Representative images of the migration and invasion assay. CL1-0 cells were transfected with the empty vector, FOXD1, Gal-3, or both FOXD1 and Gal-3 expression vector for 48 h. (D) Proliferation ability was analyzed by CCK-8 assay. (E) Representative images of colony-forming assay. (F) Representative images of migration and invasion assay.