These newly proposed molecular subgroups (SCLC‐A, SCLC‐N, SCLC‐P and SCLC‐Y) have been defined based on the expression pattern of transcription factors ASCL1, NEUROD1, POU2F3 and YAP1, respectively.4, 6. This evidence concerns the gene YAP1 and small cell lung carcinoma.