Other categories included genes relevant to interactions with the extracellular matrix (adhesion, cytoskeleton and extracellular matrix), calcium ion channels (Table S2 in File S1) and genes encoding central components of the signaling pathways previously shown to be enriched in the airway BC transcriptome [6], such as NF-κB, vascular endothelial growth factor (VEGF), epidermal growth factor receptor (EGFR), Notch, and transforming growth factor beta (TGF-β); (Figure S1 in File S1). This evidence concerns the gene NFKB1 and breast cancer.