NKX2-1 and neoplasm: First, the association of expression of NKX2‐1/TTF‐1 exon 1 was examined, which was detected by CAGE and RNAscope in the discovery data set, and whose tumours exhibited high‐ to intermediate‐grade histology (acinar, papillary, and solid adenocarcinoma), indicating that there were correlations among them (p = 0.0020) (see supplementary material, Figure S2).