With regard to the expression pattern of subtype‐specific proteins, we found that patients with high ASCL1‐ and NEUROD1‐expressing tumors tended to have late‐stage disease at diagnosis, whereas POU2F3 expression was nonsignificantly associated with early‐stage SCLC (supplementary material, Table S2). This evidence concerns the gene NEUROD1 and small cell lung carcinoma.