In small cell lung carcinoma, transcription factors such as NEUROD1, achaete-scute family bHLH transcription factor 1 (ASCL1), POU class 2 homeobox 3 (POU2F3), and Yes1-associated transcriptional regulator (YAP1) are used for sub-classification [9]. Here, POU2F3 is linked to small cell lung carcinoma.