(b) Heat map of the PEA3 family ETS transcription factors (ETV1, ETV4, and ETV5) and neuroendocrine transcription factors (ASCL1, NEUROD1, INSM1, and POU3F2 [BRN2]) in small cell lung cancer and lung adenocarcinoma cell lines. This evidence concerns the gene INSM1 and small cell lung carcinoma.