Dot plots showing gating of ALDH1+ve and ALDH1-ve subpopulations in H460, H1299 and SKMES-1 CisR cells are shown (Supplementary Fig. 1). These data indicate a subpopulation of cisplatin-resistant lung cancer cells that are enriched for an ALDH1+ve cell subset. This evidence concerns the gene ALDH1A1 and lung cancer.