Analysis of the initial gene expression revealed that YAP1 was expressed in only about 2% of SCLCs, while subsequent studies implied that YAP1 was expressed in about 10% of YAP1-positive SCLCs, and notably, analysis of the YAP1 mRNA showed that YAP1 mRNA expression failed to discriminate between distinct tumor subsets different from the ASCL1, NEUROD1, and POU2F3 subsets. Here, YAP1 is linked to neoplasm.