Knockdown of ILP2 reverses the promoting effects of HOXD8 knockdown on the proliferation, migration and invasion of breast cancer cells. (A) Transfection efficiency of shRNA-ILP2 was determined using western blotting. Cell proliferation following ILP2 knockdown was analyzed using (B) Cell Counting Kit-8 and (C and D) colony formation assays. (E and F) Cell migration was measured using a wound healing assay. (G and H) Cell invasion was determined using a Matrigel Transwell assay. (I) MMP2 and MMP9 protein expression was analyzed using western blotting. *P<0.05, **P<0.01, ***P<0.001 vs. control; #P<0.05, ###P<0.001 vs. shRNA-HOXD8 + shRNA-NC; n≥3. Scale bar, 100 µm. HOXD8, homeobox D8; ILP2, inhibitor of apoptosis-like protein-2; NC, negative control; shRNA, short hairpin RNA.