Lung tissue sections were stained using anti-FOXM-1, anti-Ki-67, anti-PH3 (Santa Cruz) and anti-Cleaved Caspase-3 (Abcam) antibodies, as described previously (33 (link)). Tumor cells growing on coverslips were treated with 20 μM of RCM-1 for 24 h, fixed and stained with antibodies against FOXM1, FOXA1, β-catenin, Ki-67 and α-tubulin (Santa Cruz) as previously described (32 (link)).