Investigation of microarray data from the Cancer Cell Line Encyclopedia (CCLE) (Barretina et al., 2012) showed that the median values of NKX2‐1 expression in lung cancers were higher among cancers originating from different tissues (Fig. 1A), and SCLC showed significantly higher expression than other types of lung cancers (Fig. 1B). Here, NKX2-1 is linked to small cell lung carcinoma.