There are subtypes of SCLC with expression of ASCL1 (Achaete-Scute Family BHLH Transcription Factor 1), NEUROD1 (Neuronal Differentiation 1), POU2F3 (POU Class 2 Homeobox 3), and YAP1 (Yes1 Associated Transcriptional Regulator) [6,7]. Here, POU2F3 is linked to small cell lung carcinoma.