NFIB and small cell lung carcinoma: KRT4 and SDPR gene loci, which were TTF‐1‐bound genes in LADC cells (Isogaya et al., 2014), had peaks only in H441 cells, whereas NFIB and NCAM1 gene loci, which are known as oncogenes for SCLC (Calbo et al., 2011; Semenova et al., 2016), had peaks mainly in H209 cells (Fig. 2C).