We also found a concordant abundance of Snail and Zeb1 transcripts in BRCA (breast cancer), LUAD (lung adenocarcinoma), LUSC (lung squamous cell carcinoma) and HNSC (head and neck squamous cell carcinoma) samples (Figure S1b), suggesting crosstalk between the Snail and Zeb1 transcripts in human cancer. This evidence concerns the gene SNAI1 and squamous cell lung carcinoma.